SEA - DEN

£44 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 3/5. 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
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
£99
Overall average: £169
Southwest
Thu 7/5Mon 11/5
SEA - DEN • Direct
Cheapest direct flights
£103
Typical prices: £123-£234
Delta
Fri 15/5Wed 20/5
SEA - DEN • Direct
Advice from real travellers
AI-powered summary based on content written by KAYAK users. AI can make mistakes.
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
Cheapest • from £99 (return)
Best reviews • 5.7 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Direct flights
You can fly direct with Alaska Airlines, Delta, and others. Average duration is 2h 44m
Direct flights
Direct flights
+1
+1
Direct flights
Direct flights
+1
Avoid delays
Most punctual • 90% on-time
Best time • Fewest delays
Insights
Insights
Insights
Insights
When to book
in advance
Our data shows that travellers who book at least 3 weeks in advance save around 22% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
Cheapest • 25% price drop
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 Denver!
Flight Deals
Booking Insights
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

Thu, 7 May - Mon, 11 May
Southwest Logo
05:30 - 09:05
SEA
-
DEN
2h 35mdirect
Southwest Logo
16:25 - 23:05
DEN
-
SEA
7h 40m
2 stops
£99Southwest
Fri, 15 May - Wed, 20 May
Delta Logo
19:59 - 23:52
SEA
-
DEN
2h 53mdirect
Delta Logo
06:05 - 08:09
DEN
-
SEA
3h 04mdirect
£103Delta
Thu, 7 May - Mon, 11 May
Southwest Logo
09:40 - 18:15
SEA
-
DEN
7h 35m
1 stop
Southwest Logo
15:20 - 23:05
DEN
-
SEA
8h 45m
2 stops
£107Southwest
Sat, 2 May - Sat, 9 May
Southwest Logo
06:40 - 12:50
SEA
-
DEN
5h 10m
1 stop
Southwest Logo
20:10 - 22:10
DEN
-
SEA
3h 00mdirect
£108Southwest
Sat, 18 Apr - Wed, 22 Apr
Delta Logo
20:00 - 23:50
SEA
-
DEN
2h 50mdirect
Delta Logo
05:30 - 09:15
DEN
-
SEA
4h 45m
1 stop
£110Delta
Sat, 18 Apr - Wed, 22 Apr
Delta Logo
05:35 - 11:32
SEA
-
DEN
4h 57m
1 stop
Delta Logo
19:45 - 22:05
DEN
-
SEA
3h 20mdirect
£111Delta
Thu, 23 Apr - Tue, 28 Apr
Southwest Logo
05:30 - 09:05
SEA
-
DEN
2h 35mdirect
Southwest Logo
14:50 - 21:00
DEN
-
SEA
7h 10m
2 stops
£111Southwest
Sat, 2 May - Wed, 6 May
Southwest Logo
06:40 - 12:50
SEA
-
DEN
5h 10m
1 stop
Southwest Logo
17:15 - 23:35
DEN
-
SEA
7h 20m
1 stop
£114Southwest
Tue, 14 Apr - Tue, 21 Apr
United Airlines Logo
05:00 - 08:44
SEA
-
DEN
2h 44mdirect
United Airlines Logo
17:57 - 23:27
DEN
-
SEA
6h 30m
1 stop
£115United Airlines
Wed, 15 Apr - Tue, 21 Apr
Delta Logo
13:30 - 20:46
SEA
-
DEN
6h 16m
1 stop
Delta Logo
18:27 - 23:59
DEN
-
SEA
6h 32m
1 stop
£118Delta
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 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 £120 (return) on average. On the other hand, the most expensive months are June and December, where the average cost of round-trip tickets is £187 and £175 respectively.

Can I save money by flying with a stopover from Seattle to Denver?

The average return price for all direct flights, flights with one stopover, and flights with two stopovers for the route found by users searching on KAYAK in the last 2 weeks.

No, with an average price for the route of £163, prices are generally cheapest when you fly direct.

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 22% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 10 weeks before departure.

Good to know - Cheap tickets from Seattle to Denver

Low seasonJanuary
Cheapest flight£44
Best time to beat the crowds (25% less expensive on average)
Most popular time to fly (6% 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 
DebraFlew with Alaska Airlines
SEA
-
DEN
Feb 2026
Seattle TSA much improved. Faster service. Baggage check-in ok. I'm sure will get faster as people get used to it.
Verified travelerFlew with Alaska Airlines
SEA
-
DEN
Mar 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 Delta
SEA
-
DEN
Apr 2025
Train from Denver airport to downtown is easy to use.
Verified travelerFlew with Alaska Airlines
SEA
-
DEN
May 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 £44 for a one-way ticket and £99 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?

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

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

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

  • 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.

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

  • Looking for a cheap flight from Denver to Seattle? 25% of our users found flights on this route for £78 or less one-way.

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.
5.7
FrontierOverall score based on 3027 reviews
5.5Comfort
4.3Entertainment
4.6Food
6.0Boarding
6.6Crew
Airline reviews

More inflight connection. And leg space is horrible. And the paying for baggage I'd ridiculous!!!

4.0 OkayContact Us, Mar 2026
DCA - DEN
Read more Frontier reviews

More inflight connection. And leg space is horrible. And the paying for baggage I'd ridiculous!!!

It was costly and difficult to check in. $85 to take a small suitcase with me, carry on or checked and $75 on the return trip, Plus $25 if I didn't check my self in check in $25, because I couldn't do it on the kiosk. Small very uncomfortable seats, waited on the runway for near an hour each way. It was my worst flight to date.

Due to weather, my flight was delayed, further delayed, then canceled. I eventually got through to a support person who helped me find a different route out of MSP, but to get to DIA, they didn't want to, but eventually did help with the connection ticket purchase. But even this replacement flight was delayed time and time again, and I would have missed my connecting flights and I didn't want to get stuck in a layover city, so after 12 hours at the airport with two young boys who were very tired, we just cancelled our plans and spent the week at home, instead of Nana's.

I knew going into this that Frontier, being a low cost carrier, would be pretty bare bones and charge for most extras but this was made up for by the fact that the airplane was a reasonably new Airbus, every employee was great and best of all, Everett Washington is an amazing airport - thanks Frontier for flying there!!!

Seats were new and comfortable. Staff was fine. Missed my connection due to weather -which wasn’t their fault- but got no help at all. Gate staff sent me to customer service, which was and stayed unstaffed. Sign with QR code directed me to call or chat. Chat was useless. Call was returned after an hour. No itinerary offered by Frontier could get me home in less than 30 hours. Rebooked with another airline and got a partial refund that came to about 10 percent of what I paid to get home.

The experience was good. No frills but I got there safe and sound and on time.

As every law enforcement agency I could imagine surrounded the plane and we didn’t disembark for 2 hours and then had to stick around for another hour to go get our personal belongings after leaving them behind and being bused away from the plane, it was scary and inconvenient. We were given no information as to why this was happening. Lack of communication with passengers was disappointing.

The ticketing agents were rude but then we had a great gate agent very nice we had to ride a buss out to where the plane was parked but it was in some back corner of the airport when we got to the plane the captain who was great btw was cleaning the plane because the same rude ticketing agent told them they we not contracted to vacuum the plane. The ride to las Vegas was fine We had a connecting flight to Dallas. The flight was fine but when we arrived in Dallas everyone who flew on any frontier airlines the picked up bags from baggage claim D15 had to wait over a hour for their bags to start we arrived at 11:30pm ish to the gate we didn't leave the baggage clamed till 12:50 am very not happy and i used to fly frontier 4 times a week for work in Denver i will not be using them again

Frontier Airlines was AWFUL. I was an hour early for my flight and the lady refused to check me in. I had to purchase a whole new ticket with a different airline.

Late, terrible communication, horrible planning of passenger seating until the literal last minute. One of the worst flying experiences of my life. Y'all suck

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

Information on your arrival and departure airports