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 18/11. 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
1 adult, Economy, 0 bags

KAYAK searches 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, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Seattle to Denver, as well as popular online travel agencies
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Flight Deals

Cheap Flights from Seattle to Denver (SEA-DEN)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for return flights from Seattle to Denver that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent return flight deals from Seattle to Denver

Wed, 10 Dec - Mon, 15 Dec
Delta Logo
15:15 - 18:54SEA-DEN
2h 39mdirect
Delta Logo
06:05 - 08:15DEN-SEA
3h 10mdirect
£73Delta
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Thu, 4 Dec - Sun, 7 Dec
Delta Logo
19:35 - 23:21SEA-DEN
2h 46mdirect
Delta Logo
06:05 - 08:15DEN-SEA
3h 10mdirect
£74Delta
Find Deal
Thu, 4 Dec - Sun, 7 Dec
Delta Logo
19:35 - 23:21SEA-DEN
2h 46mdirect
Delta Logo
06:05 - 08:15DEN-SEA
3h 10mdirect
£74Delta
Find Deal
Wed, 19 Nov - Wed, 19 Nov
Alaska Airlines Logo
05:20 - 10:35SEA-DEN
4h 15m1 stop
Alaska Airlines Logo
13:23 - 15:26DEN-SEA
3h 03mdirect
£85Alaska Airlines
Find Deal
Wed, 19 Nov - Sun, 23 Nov
Frontier Logo
13:37 - 17:30SEA-DEN
2h 53mdirect
Frontier Logo
09:44 - 11:56DEN-SEA
3h 12mdirect
£88Frontier
Find Deal
Tue, 18 Nov - Wed, 19 Nov
Alaska Airlines Logo
05:20 - 10:35SEA-DEN
4h 15m1 stop
Alaska Airlines Logo
13:23 - 15:26DEN-SEA
3h 03mdirect
£89Alaska Airlines
Find Deal
Thu, 4 Dec - Sun, 7 Dec
Southwest Logo
06:15 - 14:10SEA-DEN
6h 55m2 stops
Southwest Logo
22:35 - 00:35DEN-SEA
3h 00mdirect
£96Southwest
Find Deal
Wed, 19 Nov - Sun, 23 Nov
Frontier Logo
13:37 - 17:30SEA-DEN
2h 53mdirect
Frontier Logo
09:44 - 11:56DEN-SEA
3h 12mdirect
£98Frontier
Find Deal
Wed, 19 Nov - Sun, 23 Nov
Hawaiian Airlines Logo
05:20 - 10:35SEA-DEN
4h 15m1 stop
Hawaiian Airlines Logo
06:14 - 08:26DEN-SEA
3h 12mdirect
£107Hawaiian Airlines
Find Deal
Thu, 5 Feb - Mon, 9 Feb
Southwest Logo
06:20 - 15:50SEA-DEN
8h 30m2 stops
Southwest Logo
20:45 - 22:50DEN-SEA
3h 05mdirect
£114Southwest
Find Deal

Everything you should know

Our travellers' advice
AI-generated summary based on content written by KAYAK users
Alaska Airlines is known for punctuality on this route.
Be prepared for security checks at Seattle Airport.
User tips
User tips
User tips
User tips
Top airlines
Delta
Cheapest • from £73 (return)
Delta
Best reviews • 7.9 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
When to book
3 weeks
in advance
Our data shows that travellers who book at least 3 weeks in advance save around 17% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
January
Cheapest • 13% price drop
December
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Cheapest return fare
£73
Overall average: £193
Delta
Wed 10/12Mon 15/12
SEA - DEN • Direct
Cheapest one-way flight
£48
Typical prices: £64-£141
Alaska Airlines
Tue 18/11
SEA - DEN • 1 stop
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KAYAK searches hundreds of sites at once to find you the best travel deals.
We hope you love your trip to Denver!
Booking Insights

KAYAK's insights & trends for Seattle to Denver flights

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 round-trip flights from Seattle to Denver clicked on KAYAK for each day over the last 12 months.

For Seattle to Denver, Thursday is the cheapest day to fly on average and Friday is the most expensive. Flying from Denver back to Seattle, the best deals are generally found on Thursday, with Tuesday 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 round-trip 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 £141 (return) on average. On the other hand, the most expensive months are December and April, where the average cost of round-trip tickets is £193 and £178 respectively.

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

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip 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 week.

To get a below average price on the flight from Seattle to Denver, you should book around 3 weeks before departure, which saves you about 17% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 10 weeks before departure.

Find deals

Good to know - Cheap tickets from Seattle to Denver

Low seasonJanuary
Cheapest flight£48
Best time to beat the crowds (13% less expensive on average)
Most popular time to fly (19% more expensive on average)
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 return price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or returns 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.

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

Insights shared by verified travellers who flew the route from Seattle to Denver 
Learn how KAYAK collects reviews and tips from users.
Verified travelerFlew with Alaska AirlinesSEA-DENMar 2025
Alaska Air is very efficient & on-time so allow enough time to get luggage, go thru Customs & Immigration, & long security lines. Terminals in SEA are readily accessible by trains but more signage is needed. Fortunately, Information booths are everywhere & are manned by very helpful staff.
MichaelFlew with DeltaSEA-DENApr 2025
Train from Denver airport to downtown is easy to use.
Verified travelerFlew with Alaska AirlinesSEA-DENMay 2024
When flying from Seattle to Denver, be ready to take our any electronics and put them in separate bins when going through security. You will also most likely have to take off your jacket as well. During our flight back the flight randomly changed so be on the lookout in case that happens to you! It was by chance that I checked my ticket and saw that the gate changed last minute.

FAQs for booking flights from Seattle to Denver

  • 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 £73 for a return.

  • Which airports will I be using when flying from Seattle to Denver?

    Seattle and Denver are both served by 1 main airport. You will leave Seattle from Seattle/Tacoma Intl and will be arriving at Denver Intl.

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

    All the following airlines offer inflight Wi-Fi service on the Seattle to Denver flight route: Alaska Airlines, Hawaiian Airlines, Delta, American Airlines, Aeromexico, and Air France.

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

    The Boeing 737 MAX 9 is the aircraft model that flies most regularly on the Seattle to Denver flight route.

  • Which airline alliances offer flights from Seattle to Denver?

    SkyTeam is the only airline alliance operating flights between Seattle and Denver.

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

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

  • 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 return ticket. You could then fly to Denver with an airline and back to Seattle with another airline.

  • 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.

Prefer to fly direct from Seattle to Denver?

 
Direct data is based off flight results for the next 60 days. Find direct flights from all airlines flying direct from Seattle/Tacoma Intl to Denver Intl.
Find which airlines fly direct from Seattle/Tacoma Intl Airport to Denver Intl Airport, which days they fly and book direct flights.

Direct departures

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, +2 more

Alaska Airlines, Delta, +3 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

Direct returns

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, +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

Reviews of the top airline flying 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.
7.9
DeltaOverall score based on 7992 reviews
7.9Comfort
7.9Entertainment
7.3Food
8.2Boarding
8.5Crew
Airline reviews

Staff were friendly and happy. Delta could make sure passengers that don't have the app know of changes. Without Kayak I would not have known about the change of gate or the delay. Kayak was faster to notify me.

8.0 ExcellentJulie, Oct 2025LAX - SFO
Read more Delta reviews

Staff were friendly and happy. Delta could make sure passengers that don't have the app know of changes. Without Kayak I would not have known about the change of gate or the delay. Kayak was faster to notify me.

They ended up paying for the bag twice, but the counter wouldn't take my baggage receipt. Left it to me to resolve. Not sure how to resolve the issue.

The customer service before board was very rude and when I expressed my concerns about making the connecting flight she laughed and told me I bought the wrong ticket. I explained once it showed the flight was delayed it no longer let me change seats or anything. I was trying to upgrade to make sure I would get to the next gate on time.

Non stop on long haul is the way to go. Great experience

The flight used a B767 with a very old interior from before 2014. The entertainment system did not work at all during the flight despite attempts to reset the system. It was like they flew this route just to be competitive.

They changed planes and the new plane couldn’t carry enough fuel to fly across the country so we had to stop in Kansas City to refuel. Flight was delayed .

Flight was too crowded and seats are too small, especially since passengrs are getting larger. Having a middle seat is ALWAYS tough! Woman on my left was large & kept creeping in to my space. Flight personnel were great! Have more savory rather than sweet snacks please.

Flight was crowded and the woman sitting on my left was large & kept crouching in to my space. You need bigger seats or smaller passengers to fit into the seats you DO have! Snack were OK. Would appreciate if airlines had more savory rather than sweet snacks, thank you!

Delayed flight (1hour) plus a long layover after an overnight flight with no backup plane available.

We were delayed, which I think had to do with air traffic control. Otherwise, everything was great.

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

Information on your arrival and departure airports

Seattle (SEA)
Denver (DEN)

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