$80 Find Cheap Flights from Seattle to Denver - Compare and Save

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

• Earliest: departs at 5:00 am and lands at 7:45 am
• Latest: departs at 10:00 pm and lands at 12:45 am.

The flight takes about 2h 45m.

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

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

Prices vary by airline.

A nonstop flight from Seattle to Denver takes 2h 45m, covering 1,022 miles.

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.

Round-trip flights from Seattle to Denver range from $168 to $338, with an average of $250 over the past 12 months. Anything below $168 counts as a good deal.

Last-minute fares on this route (booked within two weeks of departure) run 37% above the $250 route average. Book 5 weeks before departure for the lowest fares.

On this route, layover flights are cheaper than nonstop options on average. Layover fares average $199 round-trip via Ontario (ONT), compared to $250 for nonstop.

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 Seattle to Denver flights are:

• United Airlines: 92% on time
• Frontier: 86% on time
• Alaska Airlines: 86% on time

Overall, flights on this route are punctual 85% of the time on average.

There is no standard. Checked-bag policies vary by airline on this route. Most carriers charge $35–$100 for the first checked bag in economy. Premium fares and elite-status bookings typically include a free checked bag.

The Airbus A321neo family is used most often on this route, operated mainly by United Airlines and Frontier. Other aircraft seen on the route include Boeing 737-800 Passenger/BBJ2 (winglets) variants.

Morning is the busiest departure period on Seattle to Denver flights, with 44% of flights leaving in that window. Afternoon departures account for 38%, evening flights for 18%, and night flights for 0%.

Yes. Based on fares seen in the past 5 days, round-trip prices on this route showed a wide range, from about $158 to $889. That means the highest observed fare was about 6x higher than the lowest one.

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

One-way fares from Seattle to Denver are currently lower than usual. Average one-way flight prices are about $139, which is 21% below the typical average for this route.

Denver Intl Airport (DEN) hosts 5 major car rental companies, with daily rates starting from around $16 for economy cars. Top options include:

• Routes Car & Truck Rentals
• Ace
• NU Car
• Europcar
• Hertz

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

Night flights have the fewest delays on this route, while afternoon departures tend to have the most.

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 Seattle to Denver route, 15% of flights were delayed in the past 3 months, with delays averaging 2h 22m.

Connecting flights from Seattle to Denver most commonly pass through:

• Ontario (ONT) - 58% of one-stop connections
• Salt Lake City (SLC) - 42% of one-stop connections

Yes. Flexible dates can save you up to 25% on flights from Seattle to Denver. Saturday is the cheapest departure day at $234 round-trip on average, while Sunday is the most expensive at $309, a difference of $75.

Cheaper weekend fares like these are typical of routes dominated by weekday business travel.

6 airlines operate flights between Seattle and Denver. The airlines offering nonstop flights on this route include:

• United Airlines
• Alaska Airlines
• Southwest
• Delta
• Frontier
• American Airlines

Flying via Salt Lake City (SLC) gives the shortest average 1-stop total travel time at 7h 38m, compared with 8h 36m via Ontario (ONT).

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

Some of the most popular sights in Denver are Colorado Convention Center, Coors Field and Ball Arena. These are among the most viewed places in Denver on KAYAK.

Among airlines operating Seattle to Denver flights:

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

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
• United Airlines: a cabin bag and a checked bag in Economy Class

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

DEN offers several transit options. The RTD A Line train runs directly from the airport to downtown Denver. Taxis are also available from DEN to downtown Denver.

Yes, Denver International Airport (DEN) has car rental agencies on airport property. A courtesy shuttle runs to and from Jeppesen Terminal. Shuttles pick up and drop off at Jeppesen Terminal Level 5, Island 4, outside doors 505–513 on the east side and 504–512 on the west side. Rentals can be reserved online in advance so a selected car is ready on arrival.

Yes. Link Light Rail serves Seattle–Tacoma International Airport (SEA) from the University of Washington and downtown Seattle. From downtown Seattle, the ride takes 38 minutes. Trains depart every 6 to 15 minutes throughout the day and also serve South Seattle neighborhoods and Capitol Hill.

Yes. Smoking is allowed in designated outdoor areas near the north end of baggage claim and across from the small parking lot. It’s prohibited inside the terminal, in the parking garage, along the airport drives and in all airfield areas.

Yes, Seattle-Tacoma International Airport (SEA) offers accessible services for travelers with special needs. Wheelchair-accessible elevators, restrooms, shuttle buses and parking spots are available. Complimentary wheelchair service is provided to the ticketing counter. SEA also offers portable induction loops and Aira visual-navigation support.

Yes, several pet relief zones are located post-security in the center cores of A, B and C Gates at Denver International Airport (DEN). Each area includes waste disposal bags, trash cans and running water.