DEN - SEA

$87 Find Cheap Flights from Denver to Seattle - Compare and Save

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Everything you should know

Cheapest round-trip
$133
Typical prices: $174-$338
Frontier
Sun 9/23Sat 9/29
DEN - SEA • Non-stop
Cheapest one-way
$87
Typical prices: $120-$239
Frontier
Fri 10/26
DEN - SEA • 1 stop
Advice from real travelers
Frontier Economy Bundle adds a carry-on and seat choice for budget value.
Delta free Wi-Fi and Alaska Premium Class add comfort on this short route.
Expert advice
+1
Expert advice
+1
Nonstop flights
You can fly direct with United Airlines, Alaska Airlines and others. Average duration is 3h 02m.
Direct flights
+1
Direct flights
+1
Avoid delays
Most punctual • 88% on-time
Best time • Fewest delays
Insights
Insights
When to book
in advance
Our data shows that travelers who book at least 6 weeks in advance save around 44% compared to booking last minute.
Insights
Insights
When to travel
Cheapest • 35% price drop
Most popular
Good to know
+1
Good to know
+1
Top layover airports
Cheapest • Avg $200 (round-trip)
Shortest trip • 5h 57m (one-way)
Insights
Insights
Start a new search
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We hope you love your trip to Seattle!
Flight Deals
Booking Insights
Expert advice
Flight Deals

Cheap Flights from Denver to Seattle (DEN-SEA)

 
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Denver to Seattle

Wed, Sep 23 - Tue, Sep 29
Frontier Logo
1:07 pm - 3:08 pmDEN  Denver Intl-SEA Seattle/Tacoma Intl
3h 01mnonstop
Frontier Logo
4:27 pm - 8:21 pmSEA  Seattle/Tacoma Intl-DEN Denver Intl
2h 54mnonstop
$133Frontier
Fri, Oct 16 - Sat, Oct 24
Frontier Logo
1:07 pm - 3:12 pmDEN  Denver Intl-SEA Seattle/Tacoma Intl
3h 05mnonstop
Frontier Logo
4:27 pm - 8:17 pmSEA  Seattle/Tacoma Intl-DEN Denver Intl
2h 50mnonstop
$133Frontier
Tue, Nov 10 - Sat, Nov 14
Multiple Airlines Logo
7:45 am - 9:51 amDEN  Denver Intl-SEA Seattle/Tacoma Intl
3h 06mnonstop
Multiple Airlines Logo
11:59 am - 6:19 pmSEA  Seattle/Tacoma Intl-DEN Denver Intl
5h 20m1 stop Portland
$189Multiple Airlines
Wed, Oct 7 - Wed, Oct 7
Alaska Airlines Logo
9:45 am - 3:17 pmDEN  Denver Intl-SEA Seattle/Tacoma Intl
6h 32m1 stop San Diego
Alaska Airlines Logo
6:54 pm - 10:37 pmSEA  Seattle/Tacoma Intl-DEN Denver Intl
2h 43mnonstop
$211Alaska Airlines
Tue, Oct 6 - Tue, Oct 6
Alaska Airlines Logo
9:45 am - 3:17 pmDEN  Denver Intl-SEA Seattle/Tacoma Intl
6h 32m1 stop San Diego
Alaska Airlines Logo
6:54 pm - 10:37 pmSEA  Seattle/Tacoma Intl-DEN Denver Intl
2h 43mnonstop
$211Alaska Airlines
Sat, Oct 10 - Sat, Oct 17
Multiple Airlines Logo
5:57 pm - 7:58 pmDEN  Denver Intl-SEA Seattle/Tacoma Intl
3h 01mnonstop
Multiple Airlines Logo
4:27 pm - 8:17 pmSEA  Seattle/Tacoma Intl-DEN Denver Intl
2h 50mnonstop
$213Multiple Airlines
Sat, Nov 21 - Sat, Nov 28
United Airlines Logo
7:10 pm - 9:19 pmDEN  Denver Intl-SEA Seattle/Tacoma Intl
3h 09mnonstop
United Airlines Logo
10:00 pm - 1:41 amSEA  Seattle/Tacoma Intl-DEN Denver Intl
2h 41mnonstop
$267United Airlines
Wed, Dec 30 - Sat, Jan 2
United Airlines Logo
7:18 pm - 9:25 pmDEN  Denver Intl-SEA Seattle/Tacoma Intl
3h 07mnonstop
United Airlines Logo
7:10 pm - 10:55 pmSEA  Seattle/Tacoma Intl-DEN Denver Intl
2h 45mnonstop
$267United Airlines
Sat, Nov 14 - Sat, Nov 21
Delta Logo
1:15 pm - 3:25 pmDEN  Denver Intl-SEA Seattle/Tacoma Intl
3h 10mnonstop
Delta Logo
7:59 pm - 11:47 pmSEA  Seattle/Tacoma Intl-DEN Denver Intl
2h 48mnonstop
$267Delta
Tue, Dec 15 - Tue, Dec 22
Delta Logo
6:00 am - 8:12 amDEN  Denver Intl-SEA Seattle/Tacoma Intl
3h 12mnonstop
Delta Logo
7:40 pm - 11:28 pmSEA  Seattle/Tacoma Intl-DEN Denver Intl
2h 48mnonstop
$267Delta
Booking Insights

Price, demand and travel trends for Denver to Seattle flights

Use KAYAK data on prices, travel dates, airlines and seasonal trends to compare options and book flights from Denver to Seattle with more confidence.

How much is a round-trip flight from Denver to Seattle?

Round-trip flights from Denver to Seattle start at $133. Prices are below average for this route right now, with typical round-trip fares ranging from $174 to $338. The lowest price found in the past 5 days was $133 on Frontier.

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

Wednesday is the cheapest day of the week to fly from Denver to Seattle, it is 5% cheaper than the average day. Sunday is the most expensive day with flight prices 5% higher than average. Based on deals found by KAYAK users in the last 12 months.

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

  • January is the cheapest month to fly from Denver to Seattle at $166 round-trip.
  • July ($321) and June ($312) are the most expensive months.
  • The price difference between flying in the cheapest and most expensive months is 93% on average.
This is based on KAYAK aggregated and averaged internal data over the past 12 months.

When are prices from Denver to Seattle the cheapest?

Flights from Denver to Seattle are cheapest 6 weeks before departure. Booking in this window typically costs about 44% less than the average last-minute fare (within 2 weeks of the flight), based on KAYAK data.

Expert advice

Expert advice for your flight from Denver to Seattle

 
KAYAK teamed up with top travel experts to share the best tips for your journey.
Our travel experts
Stefanie Waldek

Stefanie Waldek

Expert on Frontier, United Airlines and Delta

Stefanie Waldek is a freelance space, travel, and design writer based in Saratoga Springs, NY. Her words have appeared in Space.com, Travel + Leisure, Condé Nast Traveler, Architectural Digest, and House Beautiful, among other publications. An expert in aviation and expedition cruising, Stefanie is frequently up in the air or on the sea, likely en route to Antarctica or the Arctic.

Harriet Baskas

Harriet Baskas

Expert on Alaska Airlines, DEN and SEA

Harriet is an award-winning journalist who is happiest in an airport or an unusual museum. Her stories about airports, air travel, and the business of travel have appeared on NBC News, CNBC, USA TODAY, The Points Guy and other outlets. She is the creator of the StuckatTheAirport.com blog and the author of nine books. When not out on the road or exploring the latest airport amenities, she’s home in Seattle getting ready for the next adventure.

Blane Bachelor

Blane Bachelor

Expert on Southwest

Blane Bachelor is a journalist and editor specializing in travel and aviation who writes regularly for top global outlets. Born and raised in Florida, Blane has worked and lived in four countries, including the Netherlands, where she’s currently based with her family. Her favorite way to get to know a new destination is by running or riding a bike around town – or hearing a spooky ghost story about local history. She will always choose the window seat.

Key details for Denver to Seattle flights

Low season

January

Cheapest flight

$87
Best time to beat the crowds with an average 35% drop in price.
Most popular time to fly with an average 21% increase in price.
Flight from Denver to Seattle

When to book flights from Denver to Seattle

Are your dates flexible? Find out the best times to travel from Denver to Seattle based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price

Flights from Denver to Seattle: the best tips from KAYAK users' own experiences

Insights shared by verified travelers who flew the route from Denver to Seattle 
Verified travelerFlew with Delta-Jun 2025
If you are on the left side of the plane you should spot Mt. Rainer on your way into Seattle.
Verified travelerFlew with Alaska Airlines-Oct 2024
Go early, it’s a big airport. There are two TSA screening areas, one might be more crowded than the other. From checking it to the gate give yourself at least 20-30 minutes to get there.

Your Denver to Seattle flight questions, answered

Find helpful route details based on KAYAK data, including flight times, airports, airlines and booking questions.

  • Does Denver International Airport offer any amenities for pets or service animals?

    In addition to having several indoor pet relief areas in Terminals A, B, and C of Denver International Airport, there is an outdoor relief zone that can be found in Jeppesen Terminal. Each of these areas contains grass, secure fencing, soap, running water, and waste disposal bags. There is also a 4 Paws Pet Resort that is connected to the airport via a free shuttle and provides boarding and grooming services for animals.

  • Do any airlines have lounges for their customers at Denver International Airport?

    Both American Airlines and Delta Airlines have lounges located in Concourse A of Denver International Airport in the Departures terminal. Additionally, United Club has two lounges that can be found in the airport’s East Wing and West Wing, and they also offer an annual membership program.

  • Are there any shower facilities at Seattle-Tacoma International Airport?

    To take a quick shower after your plane has landed, go to the Delta Airlines Sky Club between Gates S8 and S9 in Seattle-Tacoma International Airport. This lounge allows travelers to buy entry tickets at the door and has shower stalls, hairdryers, towels, and toiletry kits that contain shampoo and soap.

  • Where can I rent a car at Seattle-Tacoma International Airport?

    To rent a car from Seattle-Tacoma International Airport, go to the Rental Car Facility by taking the free 24h shuttle that departs from outside of the Arrivals terminal. Several major rental companies can be found in this center, including Budget and Enterprise, and most of them keep their cars on-site or provide free transportation to their parking garage facility.

  • Which is the best way to get to downtown Seattle from SEA?

    The distance from SEA to the city center of Seattle is approximately 13.8 miles. A light rail provides the best way to travel between these two distances, taking about 40min to complete the journey. Another option is to hop onto the airport shuttle, which takes around 1h to commute from SEA to the city center of Seattle. If you want to get there in under 25min, a taxi is handy.

  • Which family-friendly amenities are the SEA?

    Seattle-Tacoma International Airport (SEA) has rooms where moms can pump or breastfeed in privacy. These facilities are situated in Concourse D on the lower level of D Annex and Concourse N on the Mezzanine level. Also in these rooms are comfy chairs, electrical sockets, and sinks.

  • Which airline allows pets on board from DEN to SEA?

    Passengers flying American Airlines will be glad to know that the carrier allows you to bring pets like cats and dogs in the cabin when traveling from DEN and SEA. Remember to carry their health documents and vaccination certificates; you must restrain them in their cages during the trip.

  • Where can I withdraw money at SEA?

    Various banks and credit unions run their ATMs at SEA, making it easy for arriving travelers to recharge their wallets. They’re situated on Concourse A and in the Baggage Claim.

  • Which airlines offer extra legroom and free seat selection on Denver to Seattle flights?

    Among airlines operating Denver to Seattle flights:

    • Frontier: offers free seat selection
    • Alaska Airlines: offers extra legroom; offers free seat selection
    • United Airlines: offers free seat selection
    • Delta: offers extra legroom; offers free seat selection
    • Southwest: offers free seat selection

    Extra legroom and free seat selection availability depends on fare class and route.

  • What airlines are available from Denver to Seattle?

    6 airlines operate flights between Denver and Seattle. The airlines offering nonstop flights on this route include:
    • United Airlines
    • Alaska Airlines
    • Southwest
    • Delta
    • Frontier
    • American Airlines

  • Which airports can I use when flying from Denver to Seattle?

    Flights from Denver to Seattle usually depart from Denver Intl (DEN) and arrive at Seattle/Tacoma Intl (SEA).

  • Which airlines include bags at no extra cost on Denver to Seattle flights?

    Here are some options for this route, based on selected ticket types and cabin classes:

    • Frontier: a cabin bag and a checked bag in Economy Class
    • Alaska Airlines: a cabin bag and a checked bag in Economy Class
    • Delta: a cabin bag and a checked bag in Economy Class

    Bag allowance can vary by ticket type, cabin class, route and airline, so travelers should check the fare details before booking.

  • What cabin classes can I book on flights from Denver to Seattle?

    Four cabin classes are available on flights from Denver to Seattle:

    • Economy Class
    • Premium Economy Class
    • Business Class
    • First Class

    Prices vary by airline.

  • How much can I save by taking a layover when flying from Denver to Seattle?

    On this route, layover flights are cheaper than nonstop options on average. Layover fares average $200 round-trip via Los Angeles Los Angeles (LAX), compared to $258 for nonstop.

  • What is the standard checked-bag allowance on flights from Denver to Seattle?

    There is no standard. Checked-bag policies vary by airline on this route. Most carriers charge $32–$100 for the first checked bag in economy. Premium fares and elite-status bookings typically include a free checked bag.

  • Which aircraft model is used most often on flights from Denver to Seattle?

    The Airbus A321neo family is used most often on this route, operated mainly by Frontier and United Airlines. Other aircraft seen on the route include Boeing 737 MAX 8 variants.

  • Which airports do connecting flights from Denver to Seattle pass through?

    One-stop flights from Denver to Seattle most commonly connect through:

    • Las Vegas Harry Reid Intl (LAS) - 29% of one-stop connections
    • San Francisco (SFO) - 29% of one-stop connections
    • Los Angeles Los Angeles (LAX) - 14% of one-stop connections
    • Phoenix Sky Harbor Intl (PHX) - 14% of one-stop connections

    Las Vegas Harry Reid Intl (LAS) handles the largest share of one-stop connections on this route.

  • Can I save money by using flexible dates for flights from Denver to Seattle?

    Yes. Being flexible with your travel dates can save you up to 10% on the Denver to Seattle route. Wednesday is the cheapest departure day at $245 round-trip on average, while Sunday is the most expensive at $272, a difference of $27. KAYAK's flexible dates feature shows options up to 3 days before and after your selected dates, making it easier to compare nearby fares.

  • At what point is a flight considered delayed from Denver to Seattle?

    A flight is considered delayed when it departs 15 minutes or more after its scheduled time. This is the standard used by the US Department of Transportation and most airline industry reporting. On the Denver to Seattle route, 16% of flights were delayed in the past 3 months, with delays averaging 2 hours 27 minutes.

  • How are flight departures from Denver to Seattle spread across the day?

    Morning is the busiest departure period on Denver to Seattle flights, with 45% of flights leaving in that window. Evening departures account for 27%, night flights for 16%, and afternoon flights for 12%.

  • What popular places can I visit in Seattle?

    Some of the most popular sights in Seattle are Pike Place Market, Pier 66 and Lumen Field. These are among the most viewed places in Seattle on KAYAK.

  • How long is a flight from Denver to Seattle?

    A nonstop flight from Denver to Seattle takes 3h 02m, covering 1,022 miles.

  • What are the earliest and latest flights from Denver to Seattle?

    These are the earliest and latest flight times available from Denver to Seattle:

    • Earliest: departs at 6:00 am and lands at 9:02 am
    • Latest: departs at 9:08 pm and lands at 12:10 am.

    The flight takes about 3h 02m.

  • How expensive are last-minute Denver to Seattle flights?

    Last-minute fares on this route - booked within 2 weeks of departure - run 37% above the route average of $257. Book 6 weeks before departure for the lowest fares.

  • Do I need a passport to fly from Denver to Seattle?

    No, a passport is not required for this domestic route, but you will need a real ID-compliant driver's license, a state ID, or another TSA-accepted form of identification.

  • Have flight prices from Denver to Seattle changed much recently?

    Yes. Based on fares seen in the past 5 days, round-trip prices on this route showed a wide range, from about $133 to $764. That means the highest observed fare was about 6x higher than the lowest one.

  • How are flight prices from Denver to Seattle looking right now?

    One-way fares from Denver to Seattle are currently lower than usual. Average one-way flight prices are about $124, which is 31% below the typical average for this route.

  • How does United Airlines’s on-time performance compare to other airlines on Denver to Seattle flights?

    United Airlines is slightly above the route average for timely arrivals, while Frontier has a lower on-time arrival rate. On-time arrival rates on Denver to Seattle flights are:

    • United Airlines: 88% on time
    • Frontier: 87% on time
    • Delta: 87% on time

    Overall, flights on this route are on time 84% of the time on average.

  • How do delay rates compare for morning and evening flights from Denver to Seattle?

    Morning flights have the fewest delays on this route. Delays tend to pile up throughout the day as one late flight pushes the next, so earlier departures are usually more reliable.

  • How much time can I save by choosing a different layover airport from Denver to Seattle?

    Flying via Phoenix Sky Harbor Intl (PHX) gives the shortest average 1-stop total travel time at 5h 57m, compared with 5h 58m via Salt Lake City (SLC) and 6h 33m via San Francisco (SFO).

  • What is the time difference between Denver and Seattle?

    Seattle is 1 hour behind Denver (Pacific Time vs Mountain Time). Plan for the time shift when scheduling connections or first-day activities.

  • What car rental options are available at Seattle/Tacoma Intl Airport (SEA)?

    Seattle/Tacoma Intl Airport (SEA) hosts 5 major car rental companies, with daily rates starting from around $4 for economy cars. Top options include:
    · Fox
    · Europcar
    · Thrifty
    · Budget
    · Dollar

  • How much should I expect to pay for a Denver to Seattle flight?

    Round-trip flights from Denver to Seattle range from $174 to $338, with an average of $257 over the past 12 months. Anything below $174 counts as a good deal.

  • Which airlines offer Wi-Fi on Denver to Seattle flights?

    Three airlines offer in-flight Wi-Fi on Denver to Seattle flights:

    • • Alaska Airlines
    • • Delta
    • • JetBlue

    Pricing varies by airline and fare class. Some plans are included with the ticket or loyalty program; others are paid add-ons priced by flight length.

Your guide to booking Denver to Seattle flights

Get tips on when to book, when to fly and what to know before your trip.
  • If your dates can be flexible, aim for a Wednesday departure instead of Sunday. On this route, Wednesday flights average $245 - about $27 less than Sunday (10% savings) based on the last 12 months.
  • For the best chance at a low fare, aim to book around 6 weeks before you fly. On this route, that window historically saves about 44% versus last-minute pricing (KAYAK booking data, last 12 months).
  • If you can choose when to travel, plan your Denver to Seattle trip for January. Fares historically average $166 round-trip in that month - typically $155 less than the most expensive month, which is July (based on the last 12 months).
  • If arriving on time is high on your priority list, United Airlines is the strongest pick on this route. 88% of United Airlines flights from Denver to Seattle arrived on time in the past 3 months, slightly above the route's average on-time arrival rate of 84%. When flights on this route do arrive late, the average delay is 2 hours 27 minutes, so choosing a carrier with strong on-time performance can make a difference on tight schedules.
  • If you have the time, taking a 1-stop flight through Los Angeles Los Angeles Airport (LAX) can be cheaper than flying direct. The cheapest layover option averages $200 round-trip on this route - about $58 less than direct flights (based on the last 12 months).
  • If you're arriving late at night and need somewhere to stay, check out these hotels close to Seattle/Tacoma Intl Airport.
    - Fairfield by Marriott Inn & Suites Seattle Sea-Tac Airport
    - Coast Gateway Hotel
    - Seattle Airport Marriott
  • Both United and Delta Airlines offer flights from Denver to Seattle that provide travelers with comfortable seats and additional legroom, as well as in-flight entertainment. If you would like to check your suitcases for free and receive complimentary snacks, opt for flying with Southwest Airlines instead.
  • If you’re traveling to Seattle for an important meeting or workshop, stop by the business center that is near the B Gates of Denver International Airport (DEN). This center provides guests with private workstations, copying services, shipping supplies, and access to the airport’s high-speed Wi-Fi.
  • To pass the time before your flight from Denver to Seattle begins boarding, go to the ZooX Public Internet Kiosk Systems in the Jeppesen Terminal of Denver International Airport. These booths allow travelers to play video games for $0.15 per minute, with a minimum payment of $3.
  • Hoping to leave one of your bags at the airport while you explore? Go to the Smarte Carte Baggage Storage desk between baggage carousels 12 and 13 of Seattle-Tacoma International Airport (SEA). In addition to offering baggage storage for $8 to $22 per item per 24h, this center also has notary and fax services.
  • To de-stress after a long day of travel, stop by the Massage Bar near the N gates of Seattle-Tacoma International Airport. 15m massages start at $18, with 30m massages costing $43. You can also have an express foot massage for less than $20.
  • Travelers with scheduled early morning flights via Denver International Airport (DEN) should consider spending a night in one of the numerous hotels around this facility. Typically, such facilities provide complimentary cars to and from the airport, making it possible to be at the terminal in time for your flight. Such hotels include Embassy Suites by Hilton Denver International Airport.
  • Denver International Airport (DEN) features only one terminal, the Jeppesen Terminal, complimented by three Concourses, A, B, and C. This terminal includes check-in facilities, security checkpoints, customs, immigration, and luggage claims. The concourses are reserved for departures. Movement between the terminal and the concourses is via The Automated Guideway Transit System, which departs at a 5-15min interval.
  • Families traveling using Denver International Airport (DEN) will be glad to know that the property caters to the needs of moms and the smallest of the family members. Lactating and nursing rooms are situated after security in every concourse from where you can pump and breastfeed in privacy. Also, the rooms feature sinks, power sockets, and comfy seats.
  • Suppose you wish to say a prayer before departing from DEN to Seattle-Tacoma International Airport (SEA). In that case, you’ll find a prayer room at this facility. Situated away from the noisy terminals, this sacred sanctuary sits in Jeppesen Terminal, Level 6 East, and it runs between 4 am and midnight every day. The room includes an Islamic Masjid and an inter-faith chapel.
  • If you’ve arrived at DEN and wish to drop off your car before flying out to Seattle-Tacoma International Airport (SEA), you won’t have a shortage of options to meet your needs. DEN offers different levels of parking, including garage, economy, short-term, and long-term. Economy parking is located on the east side of Jeppesen Terminal, and shuttles depart every 10min to get you there.

Prefer to fly direct from Denver to Seattle?

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

Direct departures

Denver Intl to Seattle/Tacoma Intl

Monday

Alaska Airlines,Delta,Frontier, +2 more

Alaska Airlines,Delta, +3 more

Tuesday

Alaska Airlines,Delta,Frontier, +2 more

Alaska Airlines,Delta, +3 more

Wednesday

Alaska Airlines,Delta,Frontier, +2 more

Alaska Airlines,Delta, +3 more

Thursday

Alaska Airlines,Delta,Frontier, +2 more

Alaska Airlines,Delta, +3 more

Friday

Alaska Airlines,Delta,Frontier, +3 more

Alaska Airlines,Delta, +4 more

Saturday

Alaska Airlines,Delta,Frontier, +2 more

Alaska Airlines,Delta, +3 more

Sunday

Alaska Airlines,Delta,Frontier, +2 more

Alaska Airlines,Delta, +3 more

See more direct flights

Direct returns

Seattle/Tacoma Intl to Denver Intl

Monday

Alaska Airlines,Delta,Frontier, +2 more

Alaska Airlines,Delta, +3 more

Tuesday

Alaska Airlines,Delta,Frontier, +2 more

Alaska Airlines,Delta, +3 more

Wednesday

Alaska Airlines,Delta,Frontier, +2 more

Alaska Airlines,Delta, +3 more

Thursday

Alaska Airlines,Delta,Frontier, +3 more

Alaska Airlines,Delta, +4 more

Friday

Alaska Airlines,Delta,Frontier, +2 more

Alaska Airlines,Delta, +3 more

Saturday

Alaska Airlines,Delta,Frontier, +2 more

Alaska Airlines,Delta, +3 more

Sunday

Alaska Airlines,Delta,Frontier, +2 more

Alaska Airlines,Delta, +3 more

See more direct flights

Everything you need to know for your flight from Denver to Seattle

Other airlines flying from Denver to Seattle