$97 Find Cheap Flights from Denver to Seattle - Compare and Save

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

• Earliest: departs at 12:25 am and lands at 3:31 am
• Latest: departs at 10:45 pm and lands at 1:51 am.

The flight takes about 3h 06m.

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

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

Prices vary by airline.

A nonstop flight from Denver to Seattle takes 3h 06m, 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 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.

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

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

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

• Frontier: 91% on time
• United Airlines: 88% on time
• Delta: 87% 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 $32–$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 MAX 8 variants.

Morning is the busiest departure period on Denver to Seattle flights, with 34% of flights leaving in that window. Afternoon departures account for 34%, evening flights for 26%, and night flights for 6%.

Yes. Based on fares seen in the past 5 days, round-trip prices on this route showed a wide range, from about $164 to $937. That means the highest observed fare was about 6x higher than the lowest one.

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

• Alaska Airlines
• Delta
• American Airlines
• 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 Denver to Seattle are currently lower than usual. Average one-way flight prices are about $138, which is 23% below the typical average for this route.

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

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

Morning flights have the fewest delays on this route, while night 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 Denver to Seattle route, 15% of flights were delayed in the past 3 months, with delays averaging 2h 25m.

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 (LAX) - 14% of one-stop connections
• Phoenix Sky Harbor Intl (PHX) - 14% of one-stop connections

Yes. Flexible dates can save you up to 10% on flights from Denver to Seattle. 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.

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

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).

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

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

Among airlines operating Denver to Seattle 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.

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.

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.

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.

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.

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.

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.

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.

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.