C$ 158 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 3:33 am
• Latest: departs at 10:45 pm and lands at 1:53 am.

The flight takes about 3h 08m.

Only Economy Class is available on flights from Denver to Seattle.

A direct flight from Denver to Seattle takes 3h 08m, covering 2,646 km.

No, a passport is not required for this domestic route, but you will need another form of identification, such as a driver's licence.

Round-trip flights from Denver to Seattle range from C$ 258 to C$ 483, with an average of C$ 373 over the past 12 months. Anything below C$ 258 counts as a good deal.

Last-minute fares on this route (booked within two weeks of departure) run 36% above the C$ 373 route average. Book 6 weeks before departure for the lowest fares.

On this route, layover flights are cheaper than direct options on average. Layover fares average C$ 280 round-trip via Los Angeles (LAX), compared to C$ 375 for direct.

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

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

There is no standard. Checked bag policies vary by airline on this route. Most carriers charge C$ 45–C$ 140 for the first checked bag in economy. Premium fares and elite status bookings typically include a free checked bag.

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

Morning is the busiest departure period on Denver to Seattle flights, with 34% 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 C$ 250 to C$ 1,224. That means the highest observed fare was about 5x 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 C$ 176, which is 32% below the typical average for this route.

Seattle/Tacoma Intl Airport (SEA) hosts 5 major car rental companies, with daily rates averaging C$ 86 for economy cars. Top options include:

• Fox
• Europcar
• Thrifty
• Budget
• Hertz

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 three 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 8% on flights from Denver to Seattle. Wednesday is the cheapest departure day at C$ 358 round-trip on average, while Sunday is the most expensive at C$ 387, a difference of C$ 29.

KAYAK's flexible dates feature shows options up to three days before and after your selected dates, making it easier to compare nearby fares.

5 airlines operate flights between Denver and Seattle. The airlines offering direct flights on this route include:

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

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 Lumen Field, T-Mobile Park, and Seattle Waterfront. 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 carry-on bag and a checked bag in Economy Class
• Alaska Airlines: a carry-on bag and a checked bag in Economy Class
• United Airlines: a carry-on bag and a checked bag in Economy Class

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