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Cheap flights from Denver to Seattle from $71

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Denver to Seattle departing on 9/21. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Find the cheapest flights from Denver to Seattle (DEN-SEA)

Cheap round-trip flights

Frontier Logo
10:29 pm - 12:30 amDEN-SEA
3h 01mnonstop
Frontier Logo
4:36 pm - 11:26 pmSEA-DEN
5h 50m1 stop
$114Frontier
Find Deal
Thu, Sep 25 - Sun, Sep 28
Frontier Logo
10:29 pm - 12:30 amDEN-SEA
3h 01mnonstop
Frontier Logo
6:12 am - 10:08 amSEA-DEN
2h 56mnonstop
$115Frontier
Find Deal
Mon, Sep 8 - Fri, Sep 12
Frontier Logo
6:00 am - 11:11 amDEN-SEA
6h 11m1 stop
Frontier Logo
1:02 pm - 4:55 pmSEA-DEN
2h 53mnonstop
$116Frontier
Find Deal
Thu, Oct 2 - Thu, Oct 9
Frontier Logo
10:29 pm - 12:30 amDEN-SEA
3h 01mnonstop
Frontier Logo
6:12 am - 10:08 amSEA-DEN
2h 56mnonstop
$117Frontier
Find Deal
Thu, Sep 18 - Thu, Sep 25
Frontier Logo
10:29 pm - 12:30 amDEN-SEA
3h 01mnonstop
Frontier Logo
1:47 pm - 3:49 pmSEA-DEN
25h 02m1 stop
$118Frontier
Find Deal
Fri, Sep 26 - Mon, Sep 29
Frontier Logo
6:00 am - 11:11 amDEN-SEA
6h 11m1 stop
Frontier Logo
6:12 am - 10:08 amSEA-DEN
2h 56mnonstop
$119Frontier
Find Deal
Thu, Sep 18 - Sun, Sep 21
Frontier Logo
10:29 pm - 12:30 amDEN-SEA
3h 01mnonstop
Frontier Logo
6:12 am - 10:08 amSEA-DEN
2h 56mnonstop
$120Frontier
Find Deal
Mon, Sep 8 - Sun, Sep 14
Frontier Logo
10:29 pm - 12:34 amDEN-SEA
3h 05mnonstop
Frontier Logo
7:00 am - 10:53 amSEA-DEN
2h 53mnonstop
$121Frontier
Find Deal
Sun, Aug 31 - Sat, Sep 13
Logo
6:20 pm - 8:21 pmDEN-SEA
3h 01mnonstop
Logo
1:02 pm - 4:55 pmSEA-DEN
2h 53mnonstop
$136
Find Deal
Sat, Oct 11 - Thu, Oct 16
Logo
8:55 pm - 10:59 pmDEN-SEA
3h 04mnonstop
Logo
5:20 am - 10:44 amSEA-DEN
4h 24m1 stop
$137
Find Deal
Tue, Sep 9 - Tue, Sep 16

Frontier flights from Denver to Seattle

Our best Frontier deals on Denver to Seattle flight tickets
Frontier
Sep 25
DEN10:29 pmDenver Intl
3h 01m
SEA12:30 amSeattle/Tacoma Intl
Sep 28
SEA4:36 pmSeattle/Tacoma Intl
5h 50m
1 stop
DEN11:26 pmDenver Intl
$114
Find similar
Frontier
Sep 8
DEN10:29 pmDenver Intl
3h 01m
SEA12:30 amSeattle/Tacoma Intl
Sep 12
SEA6:12 amSeattle/Tacoma Intl
2h 56m
DEN10:08 amDenver Intl
$115
Find similar
Frontier
Oct 2
DEN6:00 amDenver Intl
6h 11m
1 stop
SEA11:11 amSeattle/Tacoma Intl
Oct 9
SEA1:02 pmSeattle/Tacoma Intl
2h 53m
DEN4:55 pmDenver Intl
$116
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Denver to Seattle that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated August 21, 2025.
Use the filters below to find and compare flights from Denver to Seattle that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Thu 9/25

10:29 pm-12:30 am

Nonstop3h 01m

Seattle/Tacoma Intl

Sun 9/28

4:36 pm-11:26 pm

1 stop5h 50m

$114

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Mon 9/8

10:29 pm-12:30 am

Nonstop3h 01m

Seattle/Tacoma Intl

Fri 9/12

6:12 am-10:08 am

Nonstop2h 56m

$115

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Thu 10/2

6:00 am-11:11 am

1 stop6h 11m

Seattle/Tacoma Intl

Thu 10/9

1:02 pm-4:55 pm

Nonstop2h 53m

$116

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Thu 9/18

10:29 pm-12:30 am

Nonstop3h 01m

Seattle/Tacoma Intl

Thu 9/25

6:12 am-10:08 am

Nonstop2h 56m

$117

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Fri 9/26

10:29 pm-12:30 am

Nonstop3h 01m

Seattle/Tacoma Intl

Mon 9/29

1:47 pm-3:49 pm

1 stop25h 02m

$118

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Thu 9/18

6:00 am-11:11 am

1 stop6h 11m

Seattle/Tacoma Intl

Sun 9/21

6:12 am-10:08 am

Nonstop2h 56m

$119

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Mon 9/8

10:29 pm-12:30 am

Nonstop3h 01m

Seattle/Tacoma Intl

Sun 9/14

6:12 am-10:08 am

Nonstop2h 56m

$120

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Sun 8/31

10:29 pm-12:34 am

Nonstop3h 05m

Seattle/Tacoma Intl

Sat 9/13

7:00 am-10:53 am

Nonstop2h 53m

$121

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Sat 10/11

6:20 pm-8:21 pm

Nonstop3h 01m

Seattle/Tacoma Intl

Thu 10/16

1:02 pm-4:55 pm

Nonstop2h 53m

$136

DenverSeattle

DEN - SEA

DENSEA

Denver Intl

Tue 9/9

8:55 pm-10:59 pm

Nonstop3h 04m

Seattle/Tacoma Intl

Tue 9/16

5:20 am-10:44 am

1 stop4h 24m

$137

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Seattle from

How to get the cheapest flight ticket from Denver to Seattle

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Seattle?

In general, October is the cheapest month to fly from Denver to Seattle. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $171. If you don’t want to visit Seattle in October, then you should wait until September to fly from Denver, when ticket prices are also cheap, with an average price of $176.

What is the cheapest day to depart on your flight to Seattle?

On average, the least expensive day to fly to Seattle from Denver is on a Thursday. momondo users have found tickets for Thursday departures for as low as $287. However, this price may fluctuate depending on the airline, the season, and holidays. On the other hand, Sunday is the most expensive day to depart from Denver because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $449.

What is the cheapest time of day to depart on your flight to Seattle?

Flying to Seattle from Denver in the afternoon is the least expensive time of day to depart. momondo users have found prices as low as $265 when looking at flights departing in the afternoon. Flights to Seattle are more costly in the morning, with an average ticket price of $387. Departure times in the morning fall within the peak daily travel times, which is why tickets can be more expensive.

What is the cheapest Denver Intl to Seattle/Tacoma Intl flight route?

Fly from Denver Intl to Seattle/Tacoma Intl for the best Denver Intl - Seattle/Tacoma Intl flight prices

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

You are more likely to see cheaper flights to Seattle from Denver when booking weeks ahead of your departure date. In general, you can expect to find flights to Seattle for around $210 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Seattle from Denver for as low as $179 on momondo.

What cabin class options are available on Denver Intl to Seattle/Tacoma Intl flights?

There are 4 cabin classes available to choose from on Denver Intl to Seattle/Tacoma Intl flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on Denver to Seattle flights?

No. A direct flight is the cheapest option for a flight between Denver to Seattle.

How have Denver to Seattle flight prices changed over time?

As of August 2025, prices for Denver to Seattle flights are approximately 16% more expensive when compared to flights at the same time last year.

When to book flights from Denver to Seattle

Are you open to changing your travel dates? Check out the ideal times to fly from Denver to Seattle according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Denver to Seattle (DEN to SEA) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Denver to Seattle

Best Price Found

$147

Fastest flight time

2h 54m

Direct flights

Every day

Airports in Seattle

1 airport
The best one-way flight to Seattle from Denver in the past 72 hours is $147. The best round-trip flight deal from Denver to Seattle found on momondo in the last 72 hours is $166.
The fastest flight from Denver to Seattle takes 2h 54m
Direct flights go from Denver to Seattle every day.
There is 1 airport near Seattle: Seattle/Tacoma Intl (SEA)
Search flight deals

  • How far is Denver Intl to Seattle/Tacoma Intl by plane?

    A flight from Denver Intl to Seattle/Tacoma Intl will travel around 1019.6 mi. 3h 01m is a normal flight duration for this route.

  • When did momondo last update prices for flights from Denver Intl Airport to Seattle/Tacoma Intl Airport?

    Prices for flights from Denver Intl Airport to Seattle/Tacoma Intl Airport were last updated today.

  • How many operators does momondo search for flights from Denver Intl Airport to Seattle/Tacoma Intl Airport?

  • How old do you have to be to fly from Denver Intl Airport to Seattle/Tacoma Intl Airport?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Denver Intl Airport to Seattle/Tacoma Intl Airport.

  • What documentation or ID do you need to fly to Seattle/Tacoma Intl Airport?

    The required travel and health documents for your Seattle/Tacoma Intl Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Seattle/Tacoma Intl Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

  • What is the most popular plane model from Denver to Seattle?

  • What is the most popular airline from Denver to Seattle?

Best airlines flying from Denver to Seattle

Compare and see reviews for airlines that fly from Denver to Seattle with momondo
Airline
Rating
Free Cancellation
Price
FrontierPriceFrom $61Free CancellationRating
5.8
3,207 reviews
Search Frontier flights
DeltaPriceFrom $108Free CancellationRating
7.9
7,981 reviews
Search Delta flights
Hawaiian AirlinesPriceFrom $109Free CancellationRating
7.8
2,672 reviews
Search Hawaiian Airlines flights
SouthwestPriceFrom $137Free CancellationRating
8.0
4,245 reviews
Search Southwest flights
United AirlinesPriceFrom $148Free CancellationRating
7.4
8,930 reviews
Search United Airlines flights
Alaska AirlinesPriceFrom $157Free CancellationRating
8.0
10,000 reviews
Search Alaska Airlines flights

  • Southwest Flights From Denver to Seattle

    Southwest operates around 25 flights from Denver to Seattle every week. The average price of these flights found in the last 72 hours has been $230, but momondo users have found Southwest deals from Denver to Seattle from as low as $137 round-trip. Southwest has been scored 8.0/10 in 4,245 reviews.

  • Alaska Airlines Flights From Denver to Seattle

    The best Alaska Airlines deal for Denver to Seattle flight tickets found on momondo in the last 72 hours was $157, round-trip. It should be noted that an average Alaska Airlines flight deal for this route in this time was higher, at $279 round-trip. Alaska Airlines operates 6 flights out of Denver into Seattle in an average week, so prices vary by time and availability. 10,000 Alaska Airlines reviews by users on momondo have scored the airline at 8.0/10.

Traveling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
Leavenworth
Tacoma
SeaTac
Ocean Shores
Olympia
Renton
Kent
Lynnwood
Federal Way
Marysville
Puyallup
Tukwila
Kirkland
Lakewood
Centralia
Cle Elum
Shoreline
Fife
Redmond
Westport

Why use momondo?

Why should I use momondo to find a flight deal from Denver to Seattle?

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Denver to Seattle for you.

Can I find flights from Denver to Seattle with flexible booking policies on momondo?

Flights from Denver to Seattle with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

How can momondo help me find flights from Denver to Seattle?

momondo provides multiple filters to help you find the best flight to Seattle from Denver. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

I’m not ready to book a flight from Denver to Seattle right now. Can momondo alert me if prices change?

Yes momondo offers price alerts on flights to Seattle from Denver. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

An easier way to manage your Seattle trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
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