DEN - SEA

£37 Find Cheap Flights from Denver to Seattle

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Denver to Seattle departing on 15/4. 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 Seattle

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Denver to Seattle, 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 Denver to Seattle, as well as popular online travel agencies
Travellers love KAYAK
41,299,237 searches in the past 7 days on KAYAK

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Everything you should know

Cheapest return fare
£69
Overall average: £156
Southwest
Tue 28/4Wed 29/4
DEN - SEA • Direct
Cheapest one-way flight
£37
Typical prices: £88-£153
Delta
Wed 15/4
DEN - SEA • Direct
Advice from real travellers
AI-powered summary based on content written by KAYAK users. AI can make mistakes.
Allow 20-30 minutes for TSA at Denver Intl.
Sit left on Delta to view Mt. Rainier on approach.
User tips
User tips
User tips
User tips
Top airlines
Southwest
Cheapest • from £69 (return)
Frontier
Best reviews • 5.7 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Direct flights
Every day
You can fly direct with Alaska Airlines, Delta, and others. Average duration is 3h 02m
Direct flights
Direct flights
+1
+1
Direct flights
Direct flights
+1
Avoid delays
United Airlines
Most punctual • 87% on-time
Morning flights
Best time • Fewest delays
Insights
Insights
Insights
Insights
When to book
3 weeks
in advance
Our data shows that travellers who book at least 3 weeks in advance save around 35% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
January
Cheapest • 34% price drop
July
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Start a new search
KAYAK searches hundreds of sites at once to find you the best travel deals.
We hope you love your trip to Seattle!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Denver to Seattle (DEN-SEA)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for return flights from Denver to Seattle 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 Denver to Seattle

Tue, 28 Apr - Wed, 29 Apr
Southwest Logo
15:00 - 16:55
DEN
-
SEA
2h 55mdirect
Southwest Logo
09:20 - 13:00
SEA
-
DEN
2h 40mdirect
£69Southwest
Sun, 10 May - Mon, 18 May
Delta Logo
06:05 - 08:09
DEN
-
SEA
3h 04mdirect
Delta Logo
19:59 - 23:52
SEA
-
DEN
2h 53mdirect
£73Delta
Wed, 29 Apr - Wed, 13 May
Southwest Logo
17:05 - 23:55
DEN
-
SEA
7h 50m
1 stop
Southwest Logo
06:30 - 10:05
SEA
-
DEN
2h 35mdirect
£76Southwest
Tue, 28 Apr - Wed, 29 Apr
Southwest Logo
14:50 - 21:00
DEN
-
SEA
7h 10m
2 stops
Southwest Logo
09:20 - 13:00
SEA
-
DEN
2h 40mdirect
£77Southwest
Tue, 14 Apr - Sun, 19 Apr
United Airlines Logo
17:57 - 23:27
DEN
-
SEA
6h 30m
1 stop
United Airlines Logo
05:00 - 08:45
SEA
-
DEN
2h 45mdirect
£78United Airlines
Thu, 7 May - Tue, 12 May
United Airlines Logo
20:58 - 22:59
DEN
-
SEA
3h 01mdirect
United Airlines Logo
05:02 - 08:46
SEA
-
DEN
2h 44mdirect
£78United Airlines
Wed, 29 Apr - Wed, 13 May
Southwest Logo
13:45 - 22:55
DEN
-
SEA
10h 10m
2 stops
Southwest Logo
06:30 - 10:05
SEA
-
DEN
2h 35mdirect
£80Southwest
Fri, 8 May - Sun, 10 May
Southwest Logo
20:10 - 00:55
DEN
-
SEA
5h 45m
1 stop
Southwest Logo
05:35 - 09:10
SEA
-
DEN
2h 35mdirect
£81Southwest
Tue, 28 Apr - Tue, 5 May
Southwest Logo
14:50 - 21:00
DEN
-
SEA
7h 10m
2 stops
Southwest Logo
13:25 - 17:10
SEA
-
DEN
2h 45mdirect
£81Southwest
Sat, 9 May - Fri, 15 May
United Airlines Logo
17:59 - 23:29
DEN
-
SEA
6h 30m
1 stop
United Airlines Logo
19:05 - 22:56
SEA
-
DEN
2h 51mdirect
£83United Airlines
Booking Insights

KAYAK’s insights & trends for Denver to Seattle flights

Get data-powered insights and trends into flights from Denver to Seattle 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 Denver to Seattle?

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

If you are looking for a flight deal from Denver to Seattle, look for departures on Mondays and avoid leaving on a Thursday, as it's usually the priciest day. When flying back from Seattle, Friday is the cheapest day to fly and Thursday is the most expensive.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Denver to Seattle, 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 Denver to Seattle is January, where tickets cost £104 (return) on average. On the other hand, the most expensive months are June and July, where the average cost of round-trip tickets is £194 and £186 respectively.

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

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Denver to Seattle, 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 Denver to Seattle, you should book around 3 weeks before departure, which saves you about 35% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 5 weeks before departure.

Find deals

Good to know - Cheap tickets from Denver to Seattle

Low seasonJanuary
Cheapest flight£37
Best time to beat the crowds (34% less expensive on average)
Most popular time to fly (18% more expensive on average)
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 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 Denver to Seattle: the best tips from KAYAK users' own experiences

Insights shared by verified travellers who flew the route from Denver to Seattle 
Learn how KAYAK collects reviews and tips from users.
Verified travelerFlew with Delta
DEN
-
SEA
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
DEN
-
SEA
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.

FAQs for booking flights from Denver to Seattle

  • What is the cheapest flight from Denver to Seattle?

    In the last 3 days, the lowest price for a flight from Denver to Seattle was £37 for a one-way ticket and £69 for a return.

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

    Alaska Airlines, Delta, JetBlue, and Air Canada offer inflight Wi-Fi service on the Denver to Seattle flight route.

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

    The Boeing 737 MAX 8 is the aircraft model that flies most regularly on the Denver to Seattle flight route.

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

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

  • How does KAYAK find such low prices on flights from Denver to Seattle?

    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 Denver to Seattle.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Denver to Seattle?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Seattle from Denver 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 Denver to Seattle?

    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 Seattle with an airline and back to Denver with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Denver to Seattle?

    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 Seattle from Denver up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

KAYAK’s top tips for finding a cheap flight from Denver to Seattle

  • Looking for a cheap flight from Seattle to Denver? 25% of our users found flights on this route for £149 or less round-trip.

Prefer to fly direct from Denver to Seattle?

 
Direct data is based off flight results for the next 60 days. Find direct flights from all airlines flying direct from Denver Intl to Seattle/Tacoma Intl.
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, +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

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

Reviews of the top airline flying from Denver to Seattle

 
See real verified KAYAK customer reviews for airlines flying from Denver to Seattle. 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 Denver to Seattle? 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.
5.7
FrontierOverall score based on 3032 reviews
6.6Crew
4.3Entertainment
4.6Food
6.0Boarding
5.5Comfort
Airline reviews

Remind customers of the need to have passport or new ID for boarding.

2.0 Mediocrejon, Mar 2026
LAX - SEA
Read more Frontier reviews

Remind customers of the need to have passport or new ID for boarding.

Flight was canceled. Most upsetting was message from Kayak, stating that the flight was canceled and click with Kayak for details regarding rebook, refund details. THERE'S NO INFORMATION PROVIDED BY KAYAK EXCEPT THAT FLIGHT IS CANCELED. AND NOW THIS SURVEY TO FIND OUT HOW WAS THE FLIGHT !!!!!!!

The flight never took off and we spent 7 hours at the airport

Gate not determined until I got to the airport - hard to plan the trip to the airport.

Our flight was canceled. I will never use Kayak nor Frontier for travel again. The entire experience was a headache.

Frontier.. nickel and dime add-ons. Flight late, on time, late again, last minute gate change, arrival gate required a shuttle to the terminal. They sure keep you guessing.. if you like a little chaos and airport anxiety, this is the airline for you!

This is my second time flying with Frontier. My current experience was very favorable. The staff from the gate to the plane was friendly, warm and professional. The food options lacked in my opinion. This area needs some attention in my opinion.

There was no food and no entertainment, so I'm not sure why these are even in the survey, as my understanding is frontier does not ever offer food without a few, not even a snack, and there are no screens so unless the flight safety talk is our entertainment why ask how we liked it?. One of the flight attendants say in the back of the plane as people filed in to their seats, yelling orders about where to put baggage and telling people to hurry up. It was the least professional experience I've ever had on a flight.

Very well recently! Frontier is improving and less harrassing customer on luggages! Positive!

Good for a budget airline! It was easy to get on, staff was really nice. Can’t say anything about the food or entertainment because it wasn’t available, which is fine.

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

Information on your arrival and departure airports

Denver (DEN)
Seattle (SEA)