SEA - DEN

£116 Find Cheap Flights from Seattle to Denver

This is the cheapest return flight price found by a KAYAK user in the last 72 hours by searching for a flight from Seattle to Denver departing on 27/9. 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

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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Flights 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

Sat, 27 Sep - Tue, 30 Sep
Delta Logo
19:40 - 23:24SEA-DEN
2h 44mdirect
Delta Logo
06:15 - 08:26DEN-SEA
3h 11mdirect
£116Delta
Find Deal
Wed, 30 Jul - Sat, 16 Aug
Delta Logo
07:20 - 11:05SEA-DEN
2h 45mdirect
Delta Logo
06:35 - 08:29DEN-SEA
2h 54mdirect
£123Delta
Find Deal
Fri, 26 Sep - Fri, 26 Sep
Alaska Airlines Logo
13:35 - 17:21SEA-DEN
2h 46mdirect
Alaska Airlines Logo
19:33 - 21:34DEN-SEA
3h 01mdirect
£141Alaska Airlines
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Sat, 30 Aug - Sat, 6 Sep
United Airlines Logo
05:07 - 08:48SEA-DEN
2h 41mdirect
United Airlines Logo
11:40 - 18:49DEN-SEA
8h 09m1 stop
£142United Airlines
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Tue, 29 Jul - Thu, 14 Aug
Alaska Airlines Logo
20:17 - 23:59SEA-DEN
2h 42mdirect
Alaska Airlines Logo
11:33 - 15:24DEN-SEA
4h 51m1 stop
£145Alaska Airlines
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Tue, 7 Oct - Sat, 11 Oct
Southwest Logo
16:55 - 20:30SEA-DEN
2h 35mdirect
Southwest Logo
07:45 - 15:55DEN-SEA
9h 10m2 stops
£149Southwest
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Wed, 23 Jul - Mon, 28 Jul
Southwest Logo
16:55 - 20:40SEA-DEN
2h 45mdirect
Southwest Logo
19:55 - 00:30DEN-SEA
5h 35m1 stop
£152Southwest
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Wed, 25 Jun - Sat, 28 Jun
Frontier Logo
06:25 - 10:12SEA-DEN
2h 47mdirect
Frontier Logo
16:44 - 18:53DEN-SEA
3h 09mdirect
£153Frontier
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Mon, 24 Nov - Fri, 28 Nov
United Airlines Logo
19:13 - 22:55SEA-DEN
2h 42mdirect
United Airlines Logo
17:55 - 23:15DEN-SEA
6h 20m1 stop
£164United Airlines
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Wed, 25 Jun - Sat, 28 Jun
Frontier Logo
12:18 - 10:12SEA-DEN
20h 54m1 stop
Frontier Logo
16:44 - 18:53DEN-SEA
3h 09mdirect
£205Frontier
Find Deal
Expert advice

Expert advice for your flight from Seattle to Denver

 
Snippets provided in this section are AI-generated based on a summarisation of KAYAK-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
KAYAK teamed up with top travel experts to share the best tips for your journey.
Airlines
Alaska Airlines

Alaska's 20-minute bag guarantee offers bonus miles if bags aren't delivered promptly at baggage claim.


Alaska's Premium Class offers extra legroom and complimentary drinks on flights over 350 miles.

Frontier

Frontier's Premium Bundle includes priority boarding and extra legroom for just CA$27 more than Economy.


Avoid Basic Fare to prevent extra fees; Economy Bundle offers carry-on and seat choice.

Read more about Frontierby Stefanie Waldek
United Airlines

United's Economy Plus offers 15 cm more legroom than standard economy, enhancing comfort on short flights.


Purchase Priority Boarding to ensure overhead bin space, especially if you're in a higher boarding zone.

Our travel experts
Harriet Baskas

Harriet Baskas

Expert on Alaska Airlines

Harriet Baskas

Harriet Baskas

Harriet is an award-winning journalist who is happiest in an airport or an unusual museum. Her stories about airports, air travel, and the business of travel have appeared on NBC News, CNBC, The Points Guy, and other outlets. She is the creator of the StuckatTheAirport.com blog and the author of nine books. When not out on the road or exploring the latest airport amenities, she’s home in Seattle getting ready for the next adventure.

Read more
Stefanie Waldek

Stefanie Waldek

Expert on Frontier and United Airlines

Stefanie Waldek

Stefanie Waldek

Stefanie Waldek is a freelance space, travel, and design writer based in Saratoga Springs, NY. Her words have appeared in Space.com, Travel + Leisure, Condé Nast Traveler, Architectural Digest, and House Beautiful, among other publications. An expert in aviation and expedition cruising, Stefanie is frequently up in the air or out at sea, likely en route to Antarctica or the Arctic.

Read more
Useful Info

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 Saturday is the most expensive. Flying from Denver back to Seattle, the best deals are generally found on Saturday, 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 October, where tickets cost £118 (return) on average. On the other hand, the most expensive months are December and April, where the average cost of round-trip tickets is £188 and £174 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. For the absolute cheapest price, our data suggests you should book 12 weeks before departure.


Good to know - Cheap tickets from Seattle to Denver

Low seasonJanuary
High seasonAugust
Cheapest flight£58
Best time to beat the crowds (9% less expensive on average)
Most popular time to fly and prices are also 9% lower 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 
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

  • Is there anywhere to smoke at Seattle-Tacoma International Airport?

    While smoking is not allowed inside any of the terminals at Seattle-Tacoma International Airport, there are two locations outside where you may smoke. The first is near the north end of the baggage claim level, and the second is across from the small parking lot. To determine if you are allowed to smoke, look for ashtrays and double check that there are no airport signs prohibiting it.

  • What is there to do while waiting at Seattle-Tacoma International Airport?

    In addition to periodic live music performances, Seattle-Tacoma International Airport also has a diverse Art Walk that is 0.5 mi long and begins near Gate A 14. There are also several Digiboo self-service kiosks located throughout the airport that allow travelers to download movies and televisions shows directly onto their portable devices.

  • Are there any amenities for pets at Denver International Airport?

    There are several pet relief zones located in the centers of Terminals A, B, and C at Denver International Airport and they provide pet owners with waste disposal bags, trashcans, and running water. Additionally, there is a Paradise 4 Paws Pet Resort adjacent to the main terminal that offers both pet boarding and grooming services.

  • Where can I grab a meal at Denver International Airport?

    Boulder Beer Tap House is located in the Jeppesen Terminal of Denver International Airport and serves a selection of burgers, appetizers, and salads, while Cantina Grill is located nearby and has a Mexican-inspired menu. The Denver Chophouse is located near the A Gates and is known for its vegan and gluten-free meals.

  • 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 £79 for a one-way ticket and £157 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, Hawaiian Airlines, Delta, and American Airlines offer inflight Wi-Fi service on the Seattle to Denver flight route.

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

    The Boeing 737-800 Passenger/BBJ2 (winglets) 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, oneworld, and Star Alliance are the airline alliances operating flights between Seattle and Denver, with SkyTeam being the most commonly used for this 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 Seattle to Denver? 25% of our users found flights on this route for £87 or less one-way and £468 or less round-trip.
  • For travelers looking for non-stop flights from Seattle to Denver, book your reservation with either United, Delta, or Frontier Airlines, as each of these companies offers many flights without layovers. If you would like some extra perks, look into flying with Southwest Airlines, as they provide free checked baggage and snacks.
  • If you’re trying to find a way to pass the time before boarding your flight from Seattle to Denver, purchase an entry ticket for the Club at SEA in Seattle-Tacoma International Airport (SEA). This lounge is open to customers of all airlines and provides guests with snacks, magazines, televisions, and games.
  • Have a question about the airport or need help finding a specific service? Look for the Airport Volunteers stationed throughout Seattle-Tacoma International Airport in bright blue jackets. These volunteers can help you find your gate, recommend dining options, and tell you about the airport’s various amenities.
  • If you are feeling sore after being cooped up in a plane for several hours, consider getting a quick massage at A Massage in Denver International Airport (DEN). With two locations near the A and B Gates, this massage parlor is a quick and convenient way to let go of any tension and stress.
  • For those that are traveling with a small child, take note of the fact that there are private nursing rooms located in each terminal of Denver International Airport. These rooms contain seating, outlets, changing tables, and sinks, and they are free to access.

Prefer to fly direct from Seattle to Denver?

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

ANA, Air France, Air Tahiti Nui, +19 more

ANA, Air France, +20 more

Tuesday

ANA, Air France, Air Tahiti Nui, +16 more

ANA, Air France, +17 more

Wednesday

ANA, Air France, Air Tahiti Nui, +19 more

ANA, Air France, +20 more

Thursday

ANA, Air France, Air Tahiti Nui, +18 more

ANA, Air France, +19 more

Friday

ANA, Air France, Air Tahiti Nui, +19 more

ANA, Air France, +20 more

Saturday

ANA, Air France, Air Tahiti Nui, +19 more

ANA, Air France, +20 more

Sunday

ANA, Air France, Air Tahiti Nui, +20 more

ANA, Air France, +21 more

See more direct flights

Direct returns

Denver Intl to Seattle/Tacoma Intl

Monday

ANA, Air Tahiti Nui, Alaska Airlines, +19 more

ANA, Air Tahiti Nui, +20 more

Tuesday

ANA, Air France, Air Tahiti Nui, +14 more

ANA, Air France, +15 more

Wednesday

ANA, Air France, Air Tahiti Nui, +18 more

ANA, Air France, +19 more

Thursday

ANA, Air Tahiti Nui, Alaska Airlines, +16 more

ANA, Air Tahiti Nui, +17 more

Friday

ANA, Air France, Air Tahiti Nui, +18 more

ANA, Air France, +19 more

Saturday

ANA, Air France, Air Tahiti Nui, +18 more

ANA, Air France, +19 more

Sunday

ANA, Air France, Air Tahiti Nui, +19 more

ANA, Air France, +20 more

See more direct flights
See more direct flights

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.
8.0
DeltaOverall score based on 7950 reviews
7.9Entertainment
7.3Food
8.2Boarding
7.9Comfort
8.5Crew
Airline reviews

Great service. Flight was delayed while we sat on the runway for a couple of hours. Weather related. Staff made is very bearable. The steward servicing the first class cabin was exceptional. Thank you! 💗

10.0 ExcellentHartaj, Jun 2025EWR - RDU
Read more Delta reviews

Great service. Flight was delayed while we sat on the runway for a couple of hours. Weather related. Staff made is very bearable. The steward servicing the first class cabin was exceptional. Thank you! 💗

5 hours of delay that could've been much shorter if Delta had taken the 1 hour delay they imposed on the flight before boarding to run any of the plane checks required for flight to find the hydraulic issue that required nearly 3 hours to fix. $24 of meal credit buys a sandwich and a soft drink. Poor communication within the terminal about what gate we'd be re-boarding from and when we'd be re-boarding.

Amazing flight! I have never noticed the uniforms of the attendants before in twenty years of flying except today when one female had the most amazing dress on. It was beautifully designed and showed she was in charge. I never dreamed I would google who designed Delta uniforms . The ultimate compliment is when another woman admires your outfit. . I hope your designer puts it on the market

It would be nice if was given wires ear buds. Overall was a good experience was able to sleep on the plane

My flight was 6 pm 6/6. Every hour they delayed it again - air condition issues then no pilot then the crew had worked too many hours and cancelled the flight at 11 pm. Sent customers to NJ a 45 minutes uber ride to a hotel. Had to be back by 5 am for a 7 am flight and again no pilot etc with another three hours of delays.

The entertainment and wifi mostly didn't work on this flight.

Terrible entertainment system - kept freezing and audio kept cutting out. Snacks were mediocre at best for a 5 hour flight.

The check in and bag drop off for Sky Priority members is slow. The Clear security was also slow - a TSA issue.

I am still upset that my bag was lost on a recent trip to Rome ; we were inconvenienced and out €150 Euros ; delta has refused to reimburse us

I am very bothered by the events today. I can't believe the flight attendants allowed someone to take my seat and made me move. It was embarrassing. I was in the right. The lady just didn't want move. I can't believe delta would allow this to stand and disrespect my rights as a passenger. The lady complained about her leg and that she couldn't move. Firstly somehow she was able to make it to row 24. Not sure how much her leg could have hurt. Secondly, I'm in plenty of pain myself. I just finished chemotherapy a several weeks ago. My body is constantly sore. Yet deltas flight attendants didn't appropriately protect my rights. In the end they found me a seat on the plane but I want to understand how delta can operate this way. They in essence allowed a bully to get their way.

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

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