DEN - SEA

£43 Find Cheap Flights from Denver to Seattle

This is the cheapest return flight price found by a KAYAK user in the last 72 hours by searching for a flight from Denver to Seattle departing on 30/1. 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

Save 26% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Bundle and saveSave money when you bundle your flight + hotel.

Filter your dealsChoose cabin class, free Wi-Fi and more.

Everything you should know

Cheapest return fare
£43
Overall average: £128
Frontier
Fri 30/1Fri 6/2
DEN - SEA • Direct
Cheapest one-way flight
£44
Typical prices: £70-£151
Delta
Wed 18/2
DEN - SEA • Direct
Our travellers' advice
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
When to book
3 weeks
in advance
Our data shows that travellers who book at least 3 weeks in advance save around 33% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
January
Cheapest • 19% 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

Fri, 30 Jan - Fri, 6 Feb
Frontier Logo
09:10 - 11:19
DEN
-
SEA
3h 09mdirect
Frontier Logo
12:34 - 16:25
SEA
-
DEN
2h 51mdirect
£43Frontier
Fri, 30 Jan - Fri, 6 Feb
Multiple Airlines Logo
11:49 - 15:44
DEN
-
SEA
4h 55m1 stop
Multiple Airlines Logo
12:34 - 16:25
SEA
-
DEN
2h 51mdirect
£66Multiple Airlines
Wed, 7 Jan - Sun, 11 Jan
Delta Logo
06:29 - 08:40
DEN
-
SEA
3h 11mdirect
Delta Logo
19:40 - 23:25
SEA
-
DEN
2h 45mdirect
£87Delta
Tue, 6 Jan - Tue, 6 Jan
Alaska Airlines Logo
08:00 - 10:08
DEN
-
SEA
3h 08mdirect
Alaska Airlines Logo
11:16 - 18:15
SEA
-
DEN
5h 59m1 stop
£90Alaska Airlines
Tue, 6 Jan - Mon, 12 Jan
Delta Logo
06:29 - 08:40
DEN
-
SEA
3h 11mdirect
Delta Logo
05:25 - 11:54
SEA
-
DEN
5h 29m1 stop
£95Delta
Fri, 9 Jan - Tue, 13 Jan
Delta Logo
18:23 - 23:22
DEN
-
SEA
5h 59m1 stop
Delta Logo
05:25 - 11:54
SEA
-
DEN
5h 29m1 stop
£102Delta
Tue, 6 Jan - Wed, 14 Jan
Alaska Airlines Logo
11:31 - 16:01
DEN
-
SEA
5h 30m1 stop
Alaska Airlines Logo
16:33 - 23:58
SEA
-
DEN
6h 25m1 stop
£109Alaska Airlines
Fri, 23 Jan - Mon, 26 Jan
Alaska Airlines Logo
11:49 - 15:44
DEN
-
SEA
4h 55m1 stop
Alaska Airlines Logo
08:55 - 12:38
SEA
-
DEN
2h 43mdirect
£110Alaska Airlines
Thu, 8 Jan - Sun, 11 Jan
Southwest Logo
08:35 - 10:45
DEN
-
SEA
3h 10mdirect
Southwest Logo
06:05 - 13:45
SEA
-
DEN
6h 40m2 stops
£113Southwest
Sun, 11 Jan - Tue, 13 Jan
Alaska Airlines Logo
12:34 - 19:11
DEN
-
SEA
7h 37m1 stop
Alaska Airlines Logo
16:33 - 23:58
SEA
-
DEN
6h 25m1 stop
£116Alaska 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 Thursdays and avoid leaving on a Tuesday, as it's usually the priciest day. When flying back from Seattle, Thursday is the cheapest day to fly and Friday 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 £128 (return) on average. On the other hand, the most expensive months are June and July, where the average cost of round-trip tickets is £184 and £184 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 33% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 5 weeks before departure.

Good to know - Cheap tickets from Denver to Seattle

Low seasonJanuary
Cheapest flight£43
Best time to beat the crowds (19% less expensive on average)
Most popular time to fly (17% 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 
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 £44 for a one-way ticket and £43 for a return.

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

    Alaska Airlines, Delta, Hawaiian Airlines, Air Canada, and JetBlue 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.

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, Southwest, +1 more

Alaska Airlines, Delta, +2 more

Wednesday

Alaska Airlines, Delta, Southwest, +1 more

Alaska Airlines, Delta, +2 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, Southwest, +1 more

Alaska Airlines, Delta, +2 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

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

Information on your arrival and departure airports