Find flights
Deals
Insights
When to book
FAQs & Tips
Direct Flights
Airlines

SEA - DEN

$48 Find cheap flights from Seattle to Denver

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Seattle to Denver departing on 6/19. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
0 bags
Sat 6/29
Sat 7/6

Search hundreds of travel sites at once for deals on flights to Denver

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Seattle to Denver.
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Seattle to Denver.
In the last 7 days travelers have searched 42,686,544 times on KAYAK, and here is why:

Save 21% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Filter your dealsChoose cabin class, free Wi-Fi and more.

Bundle and saveSave money when you bundle your flight + hotel.

Cheap flight deals from Seattle to Denver (SEA-DEN)

 
These are the cheapest deals for flights from Seattle to Denver currently on KAYAK along with options from the most popular airlines KAYAK users selected for this route. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.

Recent round-trip flight deals from Seattle to Denver

Recommended round-trip deals departing in the coming months from the most popular airlines that fly from Seattle to Denver.

Recent one-way flight deals from Seattle to Denver

Only flying one-way? Below are some of the best one-way flight deals from Seattle to Denver found on KAYAK recently.

Recent last minute flight deals from Seattle to Denver

Leaving soon but still want a bargain? Check out these latest deals for last minute flights from Seattle to Denver.

Recent direct flight deals from Seattle to Denver

The latest deals for direct flights from Seattle to Denver so you can sit back and relax without the need for a layover.

Cheap bus & train deals from Seattle to Denver

Find recent round-trip train or bus tickets from Seattle to Denver.

All round-trip flight deals to Denver

The cheapest plane tickets to Denver found on KAYAK recently.
Discover the best prices and deals for you by selecting your travel dates.
Choose your dates
9:41 am - 1:40 pmSEA-DEN
2h 59mnonstop
5:10 pm - 7:10 pmDEN-SEA
3h 00mnonstop
$93Frontier
Find Deal
Tue, Jun 11 - Tue, Jun 11
4:07 pm - 7:55 pmSEA-DEN
2h 48mnonstop
8:23 am - 10:26 amDEN-SEA
3h 03mnonstop
$95Frontier
Find Deal
Mon, Jun 10 - Sat, Jun 15
9:37 am - 1:25 pmSEA-DEN
2h 48mnonstop
6:35 am - 8:37 amDEN-SEA
3h 02mnonstop
$96Frontier
Find Deal
Sat, Oct 5 - Sat, Oct 12
4:07 pm - 7:55 pmSEA-DEN
2h 48mnonstop
8:23 am - 10:26 amDEN-SEA
3h 03mnonstop
$97Frontier
Find Deal
Mon, Jun 10 - Thu, Jun 13
10:08 pm - 1:51 amSEA-DEN
2h 43mnonstop
12:02 pm - 5:39 pmDEN-SEA
6h 37m1 stop
Fri, Aug 30 - Wed, Sep 4
7:55 pm - 11:28 pmSEA-DEN
2h 33mnonstop
6:05 am - 8:01 amDEN-SEA
2h 56mnonstop
$182Delta
Find Deal
Mon, Jul 15 - Tue, Jul 23
7:55 pm - 11:28 pmSEA-DEN
2h 33mnonstop
7:55 pm - 9:56 pmDEN-SEA
3h 01mnonstop
$187Delta
Find Deal
Mon, Aug 5 - Fri, Aug 9
11:59 pm - 9:32 amSEA-DEN
8h 33m1 stop
1:16 pm - 3:15 pmDEN-SEA
2h 59mnonstop
Fri, Jun 14 - Mon, Jun 17
6:00 am - 9:44 amSEA-DEN
2h 44mnonstop
9:59 pm - 11:58 pmDEN-SEA
2h 59mnonstop
$197Alaska Airlines
Find Deal
Sun, Jul 28 - Sat, Aug 10
6:00 am - 9:44 amSEA-DEN
2h 44mnonstop
9:45 pm - 11:44 pmDEN-SEA
2h 59mnonstop
$202Alaska Airlines
Find Deal
Sun, Jul 28 - Fri, Aug 9
9:41 pm - 1:34 amSEA-DEN
2h 53mnonstop
$48Frontier
Find Deal
Wed, Jun 19
7:54 am - 11:45 amSEA-DEN
2h 51mnonstop
$49Frontier
Find Deal
Wed, Jun 5
6:00 am - 9:44 amSEA-DEN
2h 44mnonstop
$89Alaska Airlines
Find Deal
Sat, Jul 6
8:18 pm - 11:58 pmSEA-DEN
2h 40mnonstop
$94Alaska Airlines
Find Deal
Fri, Jun 28
5:05 am - 8:48 amSEA-DEN
2h 43mnonstop
$124United Airlines
Find Deal
Sun, Aug 18
7:55 pm - 11:39 pmSEA-DEN
2h 44mnonstop
$129Delta
Find Deal
Fri, Jun 14
9:05 am - 10:54 pmSEA-DEN
12h 49m1 stop
$153Delta
Find Deal
Wed, Jun 19
3:35 pm - 11:59 pmSEA-DEN
7h 24m1 stop
$158United Airlines
Find Deal
Fri, Aug 16
12:21 am - 3:48 pmSEA-DEN
14h 27m1 stop
$228American Airlines
Find Deal
Fri, Aug 23
12:21 am - 3:48 pmSEA-DEN
14h 27m1 stop
$238American Airlines
Find Deal
Fri, Aug 30
8:14 pm - 12:15 amSEA-DEN
3h 01mnonstop
6:36 am - 8:39 amDEN-SEA
3h 03mnonstop
$100Frontier
Find Deal
Tue, Jun 4 - Tue, Jun 11
8:14 pm - 12:15 amSEA-DEN
3h 01mnonstop
8:23 am - 10:26 amDEN-SEA
3h 03mnonstop
$102Frontier
Find Deal
Tue, Jun 4 - Thu, Jun 6
8:14 pm - 12:15 amSEA-DEN
3h 01mnonstop
7:10 am - 9:10 amDEN-SEA
3h 00mnonstop
$114Frontier
Find Deal
Tue, Jun 4 - Sun, Jun 9
8:11 am - 11:58 amSEA-DEN
2h 47mnonstop
6:00 am - 7:57 amDEN-SEA
2h 57mnonstop
$269Alaska Airlines
Find Deal
Sun, Jun 2 - Wed, Jun 5
6:35 pm - 10:20 pmSEA-DEN
2h 45mnonstop
1:55 pm - 3:52 pmDEN-SEA
2h 57mnonstop
$291United Airlines
Find Deal
Mon, Jun 3 - Tue, Jun 4
11:43 am - 7:36 pmSEA-DEN
6h 53m1 stop
7:25 pm - 9:20 pmDEN-SEA
2h 55mnonstop
$300United Airlines
Find Deal
Sun, Jun 2 - Tue, Jun 4
6:09 am - 9:56 amSEA-DEN
2h 47mnonstop
12:58 pm - 2:55 pmDEN-SEA
2h 57mnonstop
$301Alaska Airlines
Find Deal
Fri, May 31 - Fri, May 31
12:28 pm - 9:52 pmSEA-DEN
8h 24m1 stop
6:53 pm - 12:15 amDEN-SEA
6h 22m1 stop
$326American Airlines
Find Deal
Fri, May 31 - Tue, Jun 4
1:30 pm - 7:16 pmSEA-DEN
4h 46m1 stop
6:10 pm - 10:21 pmDEN-SEA
5h 11m1 stop
$336Delta
Find Deal
Fri, May 31 - Tue, Jun 4
5:30 am - 12:07 pmSEA-DEN
5h 37m1 stop
6:10 pm - 10:21 pmDEN-SEA
5h 11m1 stop
$526Delta
Find Deal
Sun, Jun 2 - Sun, Jun 2
9:41 am - 1:40 pmSEA-DEN
2h 59mnonstop
5:10 pm - 7:10 pmDEN-SEA
3h 00mnonstop
$93Frontier
Find Deal
Tue, Jun 11 - Tue, Jun 11
11:28 am - 3:24 pmSEA-DEN
2h 56mnonstop
5:06 am - 7:06 amDEN-SEA
3h 00mnonstop
$95Frontier
Find Deal
Sat, Jun 8 - Mon, Jun 10
4:07 pm - 7:55 pmSEA-DEN
2h 48mnonstop
8:23 am - 10:26 amDEN-SEA
3h 03mnonstop
$97Frontier
Find Deal
Mon, Jun 10 - Thu, Jun 13
7:55 pm - 11:28 pmSEA-DEN
2h 33mnonstop
6:05 am - 8:01 amDEN-SEA
2h 56mnonstop
$182Delta
Find Deal
Mon, Jul 15 - Tue, Jul 23
7:55 pm - 11:28 pmSEA-DEN
2h 33mnonstop
7:55 pm - 9:56 pmDEN-SEA
3h 01mnonstop
$187Delta
Find Deal
Mon, Aug 5 - Fri, Aug 9
8:18 pm - 11:58 pmSEA-DEN
2h 40mnonstop
7:37 pm - 9:39 pmDEN-SEA
3h 02mnonstop
Thu, Jun 27 - Wed, Jul 3
6:00 am - 9:44 amSEA-DEN
2h 44mnonstop
9:59 pm - 11:58 pmDEN-SEA
2h 59mnonstop
$197Alaska Airlines
Find Deal
Sun, Jul 28 - Sat, Aug 10
6:00 am - 9:44 amSEA-DEN
2h 44mnonstop
9:45 pm - 11:44 pmDEN-SEA
2h 59mnonstop
$202Alaska Airlines
Find Deal
Sun, Jul 28 - Thu, Aug 8
5:05 am - 8:48 amSEA-DEN
2h 43mnonstop
8:50 pm - 10:45 pmDEN-SEA
2h 55mnonstop
$247United Airlines
Find Deal
Sun, Aug 18 - Sun, Aug 18
6:35 pm - 10:20 pmSEA-DEN
2h 45mnonstop
1:55 pm - 3:52 pmDEN-SEA
2h 57mnonstop
$291United Airlines
Find Deal
Mon, Jun 3 - Tue, Jun 4

Flights from Seattle to Denver - Travel Insights & Trends

Get data-powered insights and trends into flights from Seattle to Denver to help you find the cheapest flights, the best time to fly and much more.

What’s the cheapest day of the week to fly from Seattle to Denver?

The average price of all flights from Seattle to Denver clicked on KAYAK for each day over the last 12 months.
For Seattle to Denver, Wednesday is the cheapest day to fly on average and Sunday is the most expensive. Flying from Denver back to Seattle, the best deals are generally found on Tuesday, with Friday being the most expensive.

What is the cheapest month to fly from Seattle to Denver?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for flights from Seattle to Denver, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.
The cheapest month for flights from Seattle to Denver is January, where tickets cost $128 on average. On the other hand, the most expensive months are July and June, where the average cost of tickets is $254 and $247 respectively.

How far in advance should I book a flight from Seattle to Denver?

To calculate daily average prices, KAYAK takes all prices for each day before departure over the last year for flights from Seattle to Denver, removes the top 0.1% to account for outliers, and then takes the average of all the values for each month.
To get a below average price on the flight from Seattle to Denver, you should book around 1 week before departure. For the absolute cheapest price, our data suggests you should book 71 days before departure.

Which airlines provide the cheapest flights from Seattle to Denver?

The cheapest price for the route for each airline clicked by KAYAK users in the last 72 hours.
In the last 3 days, Frontier offered the best one-way deal for that route, at $48. KAYAK users also found Seattle to Denver round-trip flights on Frontier from $93 and on Delta from $182.

Which airlines fly most frequently between Seattle and Denver?

In normal times, Alaska Airlines flies from Seattle to Denver up to 10 times per day, United Airlines up to 9 times per day, and Southwest up to 5 times per day.

Which airlines fly non-stop between Seattle and Denver?

Airline and price data is aggregated from results in KAYAK’s search results from the last 2 weeks for flights from Seattle to Denver.
There are 5 airlines that fly nonstop from Seattle to Denver. They are: Alaska Airlines, Delta, Frontier, Southwest and United Airlines. The cheapest price of all airlines flying this route was found with Frontier at $40 for a one-way flight. On average, the best prices for this route can be found at Frontier.

How many flights are there between Seattle and Denver per day?

Each day, there are between 27 and 34 nonstop flights that take off from Seattle and land in Denver, with an average flight time of 2h 45m. The most common departure time is 2:00 pm and most flights take off in the morning. Each week, there are 209 flights. The most frequent day of departure is Thursday, when 16% of all weekly flights depart. The fewest flights depart on a Saturday.

Which cabin class options are there for flights between Seattle and Denver?

The average price of flights for each cabin class for the route found by users searching on KAYAK over the last 2 weeks.
There are 4 cabin class options for the route. These are First, Business, Economy and Prem Economy. Perform a search on KAYAK to find the latest prices and availability for all cabin fares, which differ across airlines.

How long does a flight from Seattle to Denver take?

The average nonstop flight takes 2h 33m, covering a distance of 1,022 miles.

What’s the earliest departure time from Seattle to Denver?

Early birds can take the earliest flight from Seattle at 5:00 am and will be landing in Denver at 8:35 am.

What’s the latest departure time from Seattle to Denver?

If you prefer to fly at night, the latest flight from Seattle to Denver jets off at 10:39 pm and lands at 2:29 am.

Good to know

Low season

January

High season

July

Cheapest flight

$48
Best time to beat the crowds with an average 31% drop in price.
Most popular time to fly with an average 37% increase in price.
Flight from Seattle to Denver

When to book flights from Seattle to Denver

Are your dates flexible? Find out the best times to travel from Seattle to Denver based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Seattle to Denver

  • What are some eco-friendly airlines flying between Seattle and Denver?

    When flying from Seattle to Denver, each passenger adds an average of 2304 lbs of carbon dioxide to the greenhouse effect. However, you have the option of flying more sustainably with Alaska Airlines and Frontier, as these two airlines provide flights that produce 52% less carbon dioxide emissions per passenger on this route.

  • Does Seattle-Tacoma International Airport offer accessible services?

    SEA provides accessible services for individuals with special needs. The airport has wheelchair-accessible elevators, restrooms, shuttle buses, and parking spots. The airport provides boarding and deplaning assistance, wheelchair service, and gate access assistance. SEA also provides magnifying glasses, adjustable-height chairs, earplugs, and Braille signs.

  • What are the public transportation options from Denver International Airport?

    DEN features several public transit alternatives. The RTD Airport Route connects downtown commuters to the airport. This bus route features citywide stops. The Flatiron Flyer operates from the airport to downtown Denver and back, with many stops. The University of Colorado A Line runs every 15 minutes between the airport and Union Station. You can also take a taxi from DEN to downtown.

  • Where can I park my car at Seattle-Tacoma International Airport before flying to Denver?

    In SEA, finding a parking spot is a breeze. Visitors to Denver can choose from a number of parking alternatives, including short-term, hourly, economy, and valet parking. The parking garage adjacent to the main terminal houses these parking alternatives. You can also make your parking arrangements ahead of time with the airport's online parking reservation system.

  • Are there car rentals at Denver International Airport?

    Yes, DEN does provide car rental services. At the airport, you can choose between Avis, Alamo, Budget, National, Dollar, Enterprise, and Hertz rental providers. On the lower level of the main terminal, toward the airport's western side, you'll find the car rental providers. If you want to ensure that your car choice is waiting for you on arrival, you may reserve it online in advance.

  • Can I take the train to Seattle-Tacoma International Airport?

    Yes. You can board a train to SEA You can take the Link Light Rail to the airport from the University of Washington and downtown Seattle. It is about a 30 minutes ride, departing every 6–15 minutes throughout the day. The Link Light Rail's Red Line connects the airport station with Beacon Hill and Capitol Hill neighborhoods.

  • Is there anywhere to smoke at Seattle-Tacoma International Airport?

    While smoking is not allowed inside any of the terminals at Seattle-Tacoma International Airport, there are two locations outside where you may smoke. The first is near the north end of the baggage claim level, and the second is across from the small parking lot. To determine if you are allowed to smoke, look for ashtrays and double check that there are no airport signs prohibiting it.

  • What is there to do while waiting at Seattle-Tacoma International Airport?

    In addition to periodic live music performances, Seattle-Tacoma International Airport also has a diverse Art Walk that is 0.5 mi long and begins near Gate A 14. There are also several Digiboo self-service kiosks located throughout the airport that allow travelers to download movies and televisions shows directly onto their portable devices.

  • Are there any amenities for pets at Denver International Airport?

    There are several pet relief zones located in the centers of Terminals A, B, and C at Denver International Airport and they provide pet owners with waste disposal bags, trashcans, and running water. Additionally, there is a Paradise 4 Paws Pet Resort adjacent to the main terminal that offers both pet boarding and grooming services.

  • Where can I grab a meal at Denver International Airport?

    Boulder Beer Tap House is located in the Jeppesen Terminal of Denver International Airport and serves a selection of burgers, appetizers, and salads, while Cantina Grill is located nearby and has a Mexican-inspired menu. The Denver Chophouse is located near the A Gates and is known for its vegan and gluten-free meals.

  • What is the cheapest flight from Seattle to Denver?

    In the last 3 days, the lowest price for a flight from Seattle to Denver was $48 for a one-way ticket and $93 for a round-trip.

  • Do I need a passport to fly between Seattle and Denver?

    No, a passport isn't needed to fly from Seattle to Denver. However, local authorities might ask for an official ID.

  • Which airlines offer Wi-Fi service onboard planes from Seattle to Denver?

    Alaska Airlines, Delta, American Airlines, JetBlue, and Aeromexico offer inflight Wi-Fi service on the Seattle to Denver flight route.

  • Which aircraft models fly most regularly from Seattle to Denver?

    The Boeing 737-900 is the aircraft model that flies most regularly on the Seattle to Denver flight route.

  • Which airline alliances offer flights from Seattle to Denver?

    oneworld, SkyTeam, and Star Alliance are the airline alliances operating flights between Seattle and Denver, with SkyTeam being the most commonly used for this route.

  • On which days can I fly direct from Seattle to Denver?

    There are nonstop flights from Seattle to Denver on a daily basis.

  • Which is the best airline for flights from Seattle to Denver, Delta or Alaska Airlines?

    The two airlines most popular with KAYAK users for flights from Seattle to Denver are Delta and Alaska Airlines. With an average price for the route of $208 and an overall rating of 8.0, Delta is the most popular choice. Alaska Airlines is also a great choice for the route, with an average price of $238 and an overall rating of 8.0.

  • How does KAYAK find such low prices on flights from Seattle to Denver?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Seattle to Denver.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Seattle to Denver?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Denver from Seattle is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Seattle to Denver?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Denver with an airline and back to Seattle with another airline. Booking your flights between Seattle and DEN can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Seattle to Denver?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Denver from Seattle up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

See more FAQs

KAYAK’s top tips for finding a cheap flight from Seattle to Denver

  • Looking for a cheap flight? 25% of our users found flights on this route for $99 or less one-way and $176 or less round-trip.
  • Alaska Airlines is an ideal option for families traveling from Seattle to Denver. They provide families with expansive seating options. Alaska Airlines also provides nursing facilities, such as nursing rooms, and allows breastfeeding on board. Alaska Airlines also offers a broad variety of kid-friendly entertainment, including games and cartoons. They also provide kid-friendly meals. Lastly, Alaska Airlines provides pre-boarding for mothers with toddlers.
  • From Denver International Airport (DEN), you can drive to adjacent cities such as Boulder in approximately 45min, Longmont in about 50min, and Fort Collins in around an hour and 15min. Both Cheyenne, Wyoming, and Colorado Springs are approximately 2 hours by car.
  • At Seattle-Tacoma International Airport (SEA), there are airport inter-terminal transfers onsite. The Automated People Mover links the Main Terminal and the North Satellite, and it is free. The APM departs from each terminal every three minutes and takes around two minutes to make the round trip. In addition, complimentary shuttles run every ten minutes between the airport's terminals and parking garages.
  • For travelers looking for non-stop flights from Seattle to Denver, book your reservation with either United, Delta, or Frontier Airlines, as each of these companies offers many flights without layovers. If you would like some extra perks, look into flying with Southwest Airlines, as they provide free checked baggage and snacks.
  • If you’re trying to find a way to pass the time before boarding your flight from Seattle to Denver, purchase an entry ticket for the Club at SEA in Seattle-Tacoma International Airport (SEA). This lounge is open to customers of all airlines and provides guests with snacks, magazines, televisions, and games.
  • Have a question about the airport or need help finding a specific service? Look for the Airport Volunteers stationed throughout Seattle-Tacoma International Airport in bright blue jackets. These volunteers can help you find your gate, recommend dining options, and tell you about the airport’s various amenities.
  • If you are feeling sore after being cooped up in a plane for several hours, consider getting a quick massage at A Massage in Denver International Airport (DEN). With two locations near the A and B Gates, this massage parlor is a quick and convenient way to let go of any tension and stress.
  • For those that are traveling with a small child, take note of the fact that there are private nursing rooms located in each terminal of Denver International Airport. These rooms contain seating, outlets, changing tables, and sinks, and they are free to access.
See more tips

Prefer to fly non-stop from Seattle to Denver?

Find which airlines fly direct from Seattle/Tacoma Intl to Denver Intl, which days they fly and book direct flights.

Nonstop departures

Seattle/Tacoma Intl to Denver Intl

Monday

ANA, Air France, Air Tahiti Nui, +16 more

ANA, Air France, +17 more

Tuesday

ANA, Air France, Air Tahiti Nui, +17 more

ANA, Air France, +18 more

Wednesday

ANA, Air France, Air Tahiti Nui, +16 more

ANA, Air France, +17 more

Thursday

ANA, Air France, Air Tahiti Nui, +17 more

ANA, Air France, +18 more

Friday

ANA, Air France, Air Tahiti Nui, +16 more

ANA, Air France, +17 more

Saturday

ANA, Air France, Air Tahiti Nui, +17 more

ANA, Air France, +18 more

Sunday

ANA, Air France, Air Tahiti Nui, +17 more

ANA, Air France, +18 more

See more direct flights

Nonstop returns

Denver Intl to Seattle/Tacoma Intl

Monday

ANA, Air France, Air Tahiti Nui, +16 more

ANA, Air France, +17 more

Tuesday

ANA, Air France, Air Tahiti Nui, +17 more

ANA, Air France, +18 more

Wednesday

ANA, Air France, Air Tahiti Nui, +16 more

ANA, Air France, +17 more

Thursday

ANA, Air France, Air Tahiti Nui, +18 more

ANA, Air France, +19 more

Friday

ANA, Air France, Air Tahiti Nui, +16 more

ANA, Air France, +17 more

Saturday

ANA, Air France, Air Tahiti Nui, +17 more

ANA, Air France, +18 more

Sunday

ANA, Air France, Air Tahiti Nui, +17 more

ANA, Air France, +18 more

See more direct flights
See more direct flights

Top 5 airlines serving from Seattle to Denver

 
See real verified KAYAK customer reviews for airlines flying from Seattle to Denver. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Seattle to Denver? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
8.0
Alaska AirlinesOverall score based on 9192 reviews
7.9Comfort
8.2Boarding
8.6Crew
7.3Food
7.3Entertainment
Airline reviews

Cabin crew very friendly and pleasant. Flight left late but we didn't know why. Alaska Airlines app was not user friendly -- app wouldn't let us upgrade our seats, but no indication if flight was full. We wound up having to call the airline to request an upgrade and we were told none was available. Waste of time. Baggage retrieval was easy.

8.0 ExcellentElaine, May 2024SEA - PHL
Read more about Alaska Airlines reviews

Cabin crew very friendly and pleasant. Flight left late but we didn't know why. Alaska Airlines app was not user friendly -- app wouldn't let us upgrade our seats, but no indication if flight was full. We wound up having to call the airline to request an upgrade and we were told none was available. Waste of time. Baggage retrieval was easy.

The boarding gate is literally just an aisle to the concourse. There is no seating and it's shared with several other airlines. It's crowded, hot, and standing-room only. It's difficult to hear gate announcements over the PA system with too many other carriers crammed into a small space. I've enjoyed flying AA in the past on the west coast, but the BNA single gate experience is horrendous! Never again from BNA to SEA with AA.

It was a partial full flight. But even with a spare seat it was hard to get comfortable More on me being a wide body probably

Our flights using Alaska Airlines went great! All of the flight attendants were very friendly. Big shout out to the pilots for getting us to and from our destinations safely!

I can’t complain. Perhaps passing out headphones, but it was on me to bring my own since I could have used some for my personal device.

I liked only the crew. The flyght was too much fast, faster than it should be, on 20 min faster, but not safer, I experienced on myself astranautic overload from suddenly appearing in the sky and all the vibrations of the turbines, because I had my place at the level of the wings. Pregnant woman should not be seated on the level of the wings with all turbines, pregnant woman should be offered to charge place to seat closer to front or in the back, but not at the level of all the turbines. Vibrations of turbines are not healthy for pregnancy. I hold all the flight my belly in my hands to avoid miscarriage. If it would be longer flying distances, I could have miscarriage with Alaskan airlines.

I didn't have food or use entertainment, so those evaluations are invalid.

I do not feel the priority seating I paid for was was adequate for the cost. there was no difference from coach on any other airline, and it was very uncomfortable

First flights on Alaska Air, and I will go out of my way to fly them whenever I can in the future. An incredible experience, above and beyond any other airline.

It was warm on the plane. Perhaps the people who were coughing quite often should be encouraged to wear a mask?! It was a long 4 hours.

The plane from SNA wouldn’t start after 5 tries. The team gave me an option of flying direct from LAX and giving me a Lyft ride there! Perfect!

I'm a larger, athletic guy (6'2", 260lbs powerlifter) and I found the seats incredibly uncomfortable with minimal leg room, especially in a window seat. Now, I full understand that being smaller may change my view but even if I was 80lbs less, my legs would be the same size and I was sandwiched between my seat and the seat in front of me.

Had a broken tray in business class. Crew just shrugged it off.

Everything was great except for the seat. The backrest would not stay in the upright position.

public website still broken for years randomly blocking browsers with privacy options active after loading a page maybe once. check-in on laptop was almost impossible but eventually randomly worked. had to print pass at airport since couldn't get back in to load digital pass on mobile firefox or chrome. red eye flight so smooth onboarding, plenty of room to spread out, easy offboarding. onboard wifi instructions mention vpn can cause problems connecting but fails to also mention private dns. no printed or built in menu list, seems weird to require personal device to point at qr code link for menu which does not even allow direct ordering. people with health condition risk related dietary restrictions trying to avoid for example cholesterol and sugar are left guessing what they can order either way without nutritional info highlights (cranberry juice was minute maid cocktail with as much suger as typical can of soda). tap to pay wasn't working and always seems sketchy to manually enter card info. good movie variety, so limited tv was okay.

The helpful attitude of the staff, and being a wheelchair passenger everyone was helpful and understanding. The trip was made comfortable by the upgraded seat which was given without my request, that was a great surprise. Thank you Delta.

Bag drop off was slow and annoying. Only 2 agents at the entire delta desk, and no one directing traffic for what line to be in, many confused people slowed down the process. Boarding was fine. Seats in Delta comfort plus were fine. Snacks were great! Definitely a bonus. The entertainment system was awful — old, slow, not responsive, and completely unable to play games due to some kind of error. But on the other hand, thank you to Delta for the free WiFi. That made it better.

Flight diverted in SD. Later take off in Seattle by 1.3hrs

Mi primera conexión se retrasó por lo cual perdí mi segunda conexión la cual salió adelantada

Crew was not friendly when I went to request a seat change.

The Wi-Fi was unavailable on this flight for some reason.

This was a Lufthansa flight, not United. The CSA at the counter, Ashley, was not only incompetent, but quite rude. Me and two other PAX waited over 7 minutes standing in front of her and another CSA and they ignored us. We joked that we must have accidently taken invisibility pills. She could have at least said "I'll be with you in a moment, I'm currently....". I could go on about how rude she and the other CSAs were (whispering, not communicating with me, blaming the situation on others, etc.). She would not work for me. Then, she gave me literally the worst seat on the plane. the worst. My seat kept getting bumped (rammed twice by the crew with their carts and about every 5 minutes by someone using the bathroom), listening to the bathroom all night, crowded seat, etc.

We ended up with seats in the very back. So they did not recline. Have no idea why, we reserved and checked in very early. The isles were very narrow and the seats had very little leg room. But they did give us water, and a snack.

I paid $380 for my one-way ticket from California to Minnesota. The fair did not include online check-in. I received instructions from their app to check in at a kiosk. At the kiosk, the boarding pass would not print until an actual person came to verify that I had a personal item and not a carry-on item, On the plane, the person next to me was drunk and allowed to continue to order alcohol. United is garbage I’d rather fly spirit.

The plane was dirty and the in seat air wasn't blowing as planes usually do.

Positive: Entertainment via phone on the short was great and my first time. Good food and wine and head phones for free. Negative: Seat hardly reclined on the long flight. Breakfast was an egg with a bun. No egg choices and rather have something sweet like bun/jam and Youghurt.

They did get us booked on a later flight, but it made us miss our connecting flight. So, we had to stay and another state overnight with no luggage or clothes. Because they kept our luggage at airport for next flight on the next day.

Flight was on time. Staff were friendly. I paid for Economy Plus but was required to check my standard carry-on luggage due to lack of space on the aircraft. This cost me 30 minutes, unexpectedly, in waiting at the baggage claim. This experience did not meet my expectations.

Crew is way too many times on the intercom re explaining the same thing

Amazing comfortable chairs great snacks super friendly staff pilots did excellent job. Smooth sailing all the way. Definitely be flying United more.

The boarding process and flight were great. However, I waited about 40 minutes for my luggage. It did not come up on the designated belt. Instead, everyone’s bags were on a cart. Not sure what the issue was, but we were not informed until another passenger went looking for her bags and found them.

There were delays on both ends. It made it less than excellent. This plane was great though

AA1537 the AC was not working properly. It was very hot and uncomfortable.

Worst experience flying American Airlines. I fly with them often, so I was super disappointed in the service I received at gate 30 in LGA on May 24, mid-day. The flight was delayed twice. I was patiently waiting in the American Airlines lounge when I received the notice on my app that the plane was boarding 45 minutes before its newly re-scheduled take off of 4 pm (from the orginal 1:45 pm then 3:00 pm). It took me 5 min to travel from the lounge to the gate and when I arrived there at 3:20 flight gate attendant told me the flight had closed and that they announced for passengers multiple times. I showed them the notification on my app and they were really rude and unempathetic. The person who rescheduled my flight at customer service wasn't any happier but was at least helpful in getting me on the next flight.

Flight was 1/2 hour delayed leaving Phoenix. Otherwise it was an average flight. Flight crew on this trip was very nice.

Everything was great except for the wifi was junk. Crew was super friendly and helpful

Was lucky to have a employee at the AA checkin counter that had compassion and understood they ordeal that we went through with our original flight being diverted, needing to stay in the aircraft and then flying to the original destination; adding hours to the trip and forcing us to miss our connection and our rebooked connection. She was able to get up on standby on the highest priority on the next flight to the closest airport we need to be at and it all worked out despite being many hours late.

Delayed so that missed connecting flight. Connecting flight was also delayed on the tarmac but they closed the gate before the rescheduled time.

Those seats were way too narrow. I had the middle seat, one person was a very skinny person and we still couldn’t avoid touching each other anytime one of us moved. The other person was larger and we were basically sitting in each others lap the entire flight. There was zero entertainment. The flight was long enough to justify tvs, but no. Gotta sit there in your infant seat and twiddle your thumbs.

Because I can’t stand very long in one place, I was allowed to reword.

Frontier won’t help you at the airport without paying $25. Carry on was $75. Then you get on the plain and every beverage or snack is also a charge. Seats are hard and real packed in. I would never fly them again.

The Frontier app wasn’t working. So I could not pay for a carry on the week prior to flying. They charged me 99$ at the gate to carry on a duffle bag.

Plane could have been more on time. More leg room .

Didn't like anything!! Horrible flight. Small seating area and hard seats. Butt was sore after 2 hour flight to Seattle No entertainment or free refreshments No wifi or USB charging receptacles to charge phone entoute like other airliners Luggage rates were 3 times as much as competitors. Difficult to navigate online luggue process to pre pay before flight Overall bad experience WILL NEVER RIDE OR RECOMMEND FRONTIER TO FRIENDS OR FAMILY MEMBERS!!! THIS IS A SHAME!! MOST MESERIBLE FLIGHT OF MY LIFE!! AND I THOUGHT SPIRIT WAS 👎 YOU GOT THEM BEAD HANDS DOWN!!

There were 3 leg for the trip and each leg was delayed by 90 minutes or more. The boarding process takes forever with people waiting on the jetway even though most folks do not have carry-on. The whole process is poorly managed.

Not have to pay for every single item to take a flight. Seating and delays sucked.

Terrible. Seats are bad and the baggage policy is inconsistent

Everything was good, and most importantly on time. They have been extremely tardy in some of my flights

They lost my baggage on my connection flight, it’s been 24 hours since I put my claim in and still no update on my bags.

It’s a cheap airline. I wish they had better seats.

Book cheap flights from Seattle to Denver

Recent one-way flight deals

 
Only flying one-way? Below are some of the best one-way flight deals from Seattle to Denver found on KAYAK in the last 72 hours.
6/19Wed
nonstopFrontier
2h 53mSEA-DEN
$48
6/5Wed
nonstopFrontier
2h 51mSEA-DEN
$49
7/6Sat
nonstopAlaska Airlines
2h 44mSEA-DEN
$89
6/28Fri
nonstopAlaska Airlines
2h 40mSEA-DEN
$94
8/18Sun
nonstopUnited Airlines
2h 43mSEA-DEN
$124
6/14Fri
nonstopDelta
2h 44mSEA-DEN
$129
6/19Wed
1 stopDelta
12h 49mSEA-DEN
$153
8/16Fri
1 stopUnited Airlines
7h 24mSEA-DEN
$158
8/23Fri
1 stopAmerican Airlines
14h 27mSEA-DEN
$228
8/30Fri
1 stopAmerican Airlines
14h 27mSEA-DEN
$238

Search by stops

Search by airline

Search by price

Last minute flights from Seattle to Denver

Last minute flight, train and bus deals

 
These last-minute flight deals are the cheapest flights found on KAYAK in the last 72 hours for flights from Seattle to Denver that are departing in the next 10 days.
6/4Tue
nonstopFrontier
3h 01mSEA-DEN
6/11Tue
nonstopFrontier
3h 03mDEN-SEA
$100
6/4Tue
nonstopFrontier
3h 01mSEA-DEN
6/6Thu
nonstopFrontier
3h 03mDEN-SEA
$102
6/4Tue
nonstopFrontier
3h 01mSEA-DEN
6/9Sun
nonstopFrontier
3h 00mDEN-SEA
$114
6/2Sun
nonstopAlaska Airlines
2h 47mSEA-DEN
6/5Wed
nonstopAlaska Airlines
2h 57mDEN-SEA
$269
6/3Mon
nonstopUnited Airlines
2h 45mSEA-DEN
6/4Tue
nonstopUnited Airlines
2h 57mDEN-SEA
$291
6/2Sun
multi-stopUnited Airlines
6h 53mSEA-DEN
6/4Tue
nonstopUnited Airlines
2h 55mDEN-SEA
$300
5/31Fri
nonstopAlaska Airlines
2h 47mSEA-DEN
5/31Fri
nonstopAlaska Airlines
2h 57mDEN-SEA
$301
5/31Fri
multi-stopAmerican Airlines
8h 24mSEA-DEN
6/4Tue
multi-stopAmerican Airlines
6h 22mDEN-SEA
$326
5/31Fri
multi-stopDelta
4h 46mSEA-DEN
6/4Tue
multi-stopDelta
5h 11mDEN-SEA
$336
6/2Sun
multi-stopDelta
5h 37mSEA-DEN
6/2Sun
multi-stopDelta
5h 11mDEN-SEA
$526

Search by stops

Search by airline

Search by price

Seattle - Denver Flights

Departure:

Seattle (SEA)United States

Destination:

Denver (DEN)United States

Return flight deals:

Denver - Seattle

Cabin classes:

$312
$443
$378
$87

Browse destinations: