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Cheap flights from Seattle to Denver from $78

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Seattle to Denver departing on 9/26. 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 Seattle to Denver (SEA-DEN)

Cheap round-trip flights

Frontier Logo
8:43 pm - 12:35 amSEA-DEN
2h 52mnonstop
Frontier Logo
10:00 am - 12:13 pmDEN-SEA
3h 13mnonstop
$100Frontier
Find Deal
sáb., oct. 25 - vie., oct. 31
Frontier Logo
7:00 am - 10:53 amSEA-DEN
2h 53mnonstop
Frontier Logo
10:29 pm - 12:30 amDEN-SEA
3h 01mnonstop
$101Frontier
Find Deal
mié., sep. 10 - dom., sep. 14
Frontier Logo
6:12 am - 10:08 amSEA-DEN
2h 56mnonstop
Frontier Logo
10:29 pm - 12:30 amDEN-SEA
3h 01mnonstop
$102Frontier
Find Deal
vie., sep. 5 - lun., sep. 8
Frontier Logo
6:12 am - 10:08 amSEA-DEN
2h 56mnonstop
Frontier Logo
10:29 pm - 12:30 amDEN-SEA
3h 01mnonstop
$103Frontier
Find Deal
lun., sep. 8 - dom., sep. 14
Frontier Logo
8:43 pm - 12:35 amSEA-DEN
2h 52mnonstop
Frontier Logo
5:30 am - 7:33 amDEN-SEA
3h 03mnonstop
$104Frontier
Find Deal
mié., oct. 8 - dom., oct. 12
Frontier Logo
6:12 am - 10:08 amSEA-DEN
2h 56mnonstop
Frontier Logo
10:29 pm - 12:30 amDEN-SEA
3h 01mnonstop
$105Frontier
Find Deal
jue., sep. 25 - lun., sep. 29
Frontier Logo
6:12 am - 10:08 amSEA-DEN
2h 56mnonstop
Frontier Logo
10:29 pm - 12:30 amDEN-SEA
3h 01mnonstop
$106Frontier
Find Deal
jue., sep. 25 - dom., sep. 28
Frontier Logo
2:31 pm - 6:22 pmSEA-DEN
2h 51mnonstop
Frontier Logo
10:00 am - 12:13 pmDEN-SEA
3h 13mnonstop
$107Frontier
Find Deal
dom., oct. 26 - jue., oct. 30
Logo
5:20 am - 10:44 amSEA-DEN
4h 24m1 stop
Logo
8:55 pm - 10:59 pmDEN-SEA
3h 04mnonstop
$132
Find Deal
mar., sep. 23 - mar., sep. 30
Logo
1:02 pm - 4:55 pmSEA-DEN
2h 53mnonstop
Logo
8:02 pm - 10:13 pmDEN-SEA
3h 11mnonstop
$149
Find Deal
jue., oct. 23 - mié., oct. 29

Frontier flights from Seattle to Denver

Our best Frontier deals on Seattle to Denver flight tickets
Frontier
Oct 25
SEA8:43 pmSeattle/Tacoma Intl
2h 52m
DEN12:35 amDenver Intl
Oct 31
DEN10:00 amDenver Intl
3h 13m
SEA12:13 pmSeattle/Tacoma Intl
$100
Find similar
Frontier
Sep 10
SEA7:00 amSeattle/Tacoma Intl
2h 53m
DEN10:53 amDenver Intl
Sep 14
DEN10:29 pmDenver Intl
3h 01m
SEA12:30 amSeattle/Tacoma Intl
$101
Find similar
Frontier
Sep 5
SEA6:12 amSeattle/Tacoma Intl
2h 56m
DEN10:08 amDenver Intl
Sep 8
DEN10:29 pmDenver Intl
3h 01m
SEA12:30 amSeattle/Tacoma Intl
$102
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Seattle to Denver 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 agosto 25, 2025.
Use the filters below to find and compare flights from Seattle to Denver that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

sáb. 10/25

8:43 pm-12:35 am

Nonstop2h 52m

Denver Intl

vie. 10/31

10:00 am-12:13 pm

Nonstop3h 13m

$100

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

mié. 9/10

7:00 am-10:53 am

Nonstop2h 53m

Denver Intl

dom. 9/14

10:29 pm-12:30 am

Nonstop3h 01m

$101

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

vie. 9/5

6:12 am-10:08 am

Nonstop2h 56m

Denver Intl

lun. 9/8

10:29 pm-12:30 am

Nonstop3h 01m

$102

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

lun. 9/8

6:12 am-10:08 am

Nonstop2h 56m

Denver Intl

dom. 9/14

10:29 pm-12:30 am

Nonstop3h 01m

$103

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

mié. 10/8

8:43 pm-12:35 am

Nonstop2h 52m

Denver Intl

dom. 10/12

5:30 am-7:33 am

Nonstop3h 03m

$104

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

jue. 9/25

6:12 am-10:08 am

Nonstop2h 56m

Denver Intl

lun. 9/29

10:29 pm-12:30 am

Nonstop3h 01m

$105

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

jue. 9/25

6:12 am-10:08 am

Nonstop2h 56m

Denver Intl

dom. 9/28

10:29 pm-12:30 am

Nonstop3h 01m

$106

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

dom. 10/26

2:31 pm-6:22 pm

Nonstop2h 51m

Denver Intl

jue. 10/30

10:00 am-12:13 pm

Nonstop3h 13m

$107

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

mar. 9/23

5:20 am-10:44 am

1 stop4h 24m

Denver Intl

mar. 9/30

8:55 pm-10:59 pm

Nonstop3h 04m

$132

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

jue. 10/23

1:02 pm-4:55 pm

Nonstop2h 53m

Denver Intl

mié. 10/29

8:02 pm-10:13 pm

Nonstop3h 11m

$149

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 Denver from

How to get the cheapest flight ticket from Seattle to Denver

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 Denver?

The cheapest month to fly to Denver from Seattle is in October. Flight prices, which tend to average around $165, are often lower during this time because this is during the off-season. If you don’t want to visit Denver in October, then you should wait until September to fly from Seattle, when ticket prices are also cheap, with an average price of $173.

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

The cheapest day to depart on your flight to Denver is on a Saturday when prices can be found for as low as $271. This is often the case because there is less demand to fly during this day of the week. The most expensive day to fly to Denver is Monday, with ticket prices averaging around $338.

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

The cheapest time of day to fly to Denver is in the evening when flights can be purchased for as low as $221. Flights in the morning are often more expensive with an average ticket price of $324.

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

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

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

You are more likely to see cheaper flights to Denver from Seattle when booking weeks ahead of your departure date. In general, you can expect to find flights to Denver for around $210 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Denver from Seattle for as low as $178 on momondo.

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

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

How have Seattle to Denver flight prices changed over time?

As of August 2025, prices for Seattle to Denver flights are approximately 25% more expensive when compared to flights at the same time last year.

When to book flights from Seattle to Denver

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

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

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

Best Price Found

$148

Fastest flight time

2h 35m

Direct flights

Every day

Airports in Denver

1 airport
The best one-way flight to Denver from Seattle in the past 72 hours is $148. The best round-trip flight deal from Seattle to Denver found on momondo in the last 72 hours is $173.
The fastest flight from Seattle to Denver takes 2h 35m
Direct flights go from Seattle to Denver every day.
There is 1 airport near Denver: Denver Intl (DEN)
Search flight deals

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

    A flight from Seattle/Tacoma Intl to Denver Intl will travel around 1019.6 mi. Flights usually cover this in 2h 51m, depending on flying conditions and air traffic around both airports.

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

    Prices for flights from Seattle/Tacoma Intl Airport to Denver Intl Airport refresh daily.

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

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

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Seattle/Tacoma Intl Airport to Denver Intl Airport.

  • What documentation or ID do you need to fly to Denver Intl Airport?

    The necessary travel and health documents for your Denver Intl Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

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

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

Best airlines flying from Seattle to Denver

Compare and see reviews for airlines that fly from Seattle to Denver with momondo
Airline
Rating
Free Cancellation
Price
FrontierPriceFrom $64Free CancellationRating
5.8
3,201 reviews
Search Frontier flights
Hawaiian AirlinesPriceFrom $86Free CancellationRating
7.8
2,679 reviews
Search Hawaiian Airlines flights
DeltaPriceFrom $116Free CancellationRating
7.9
7,981 reviews
Search Delta flights
SouthwestPriceFrom $129Free CancellationRating
8.0
4,243 reviews
Search Southwest flights
United AirlinesPriceFrom $147Free CancellationRating
7.4
8,940 reviews
Search United Airlines flights
Alaska AirlinesPriceFrom $166Free CancellationRating
8.0
10,000 reviews
Search Alaska Airlines flights

  • Southwest Flights From Seattle to Denver

    Southwest operates around 19 flights from Seattle to Denver every week. The average price of these flights found in the last 72 hours has been $244, but momondo users have found Southwest deals from Seattle to Denver from as low as $129 round-trip. Southwest has been scored 8.0/10 in 4,243 reviews.

  • Alaska Airlines Flights From Seattle to Denver

    Across 10,000 Alaska Airlines reviews on momondo, the average score is 8.0/10. Alaska Airlines flies from Seattle to Denver about 22 times each week, with ticket deals ranging from $166 to $303. Price data is based on momondo searches in the last 72 hours.

Traveling to a place near Denver?

Book flights to Denver if you plan to visit one of these locations
Estes Park
Breckenridge
Black Hawk
Aurora
Fort Collins
Keystone
Cripple Creek
Longmont
Boulder
Manitou Springs
Lakewood
Greeley
Westminster
Thornton
Winter Park
Grand Lake
Copper Mountain
Frisco
Silverthorne
Centennial

Why use momondo?

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

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 Seattle to Denver for you.

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

Flights from Seattle to Denver 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 Seattle to Denver?

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

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

Yes. momondo can track prices for Seattle to Denver flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

An easier way to manage your Denver 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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