What is the cheapest airline that flies from Seattle/Tacoma Intl to Denver Intl?

Southwest and Delta are the most popular carriers operating from Seattle/Tacoma Intl to Denver Intl

How many flights depart from Seattle to Denver on average per day?

The number of flights available between Seattle and Denver is 19 per day as of December 2025. The most frequent departure time is 3:00PM, with 45% of daily flights leaving in the afternoon.

What is the most punctual flight time for Seattle to Denver flights?

Generally, flights departing at night tend to experience fewer delays. Flights in the early afternoon have, in the past, seen delays more frequently in comparison.

Which airline has the best punctuality record on Seattle to Denver flights?

According to our data, United Airlines have had the least number of delays on this route over the last 12 months; with about 10% of their flights experiencing any sort of delay.

How often are flights from Seattle to Denver delayed?

Historically, on average around 18% of flights between Seattle and Denver have experienced a delay on any given week. The average delay length over the past 12 months has been 134 minutes.

What day of the week experiences the fewest flight delays on this route?

Saturday is statistically the day of the week which experiences the fewest number of delays on this flight route. Sunday has historically seen more delays on average compared to the rest of the week.

How many flights depart from Seattle to Denver on average per week?

As of December 2025, there are 137 flights per week flying from Seattle to Denver. The most common day of the week flights depart is Wed, with 22% of flights taking off on this day.

What airlines fly to Denver?

Frontier, Delta and Alaska Airlines are the top three most popular airlines that fly to Denver from Seattle according to our data. Frontier is the first choice among our users, with 43% of people opting to fly with this airline when traveling to Denver. Keep in mind that there are 6 different airlines that fly to Denver on a routine basis, so you have a few additional options to choose from.

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?

There are 6 operators available for flights from Seattle/Tacoma Intl Airport to Denver Intl Airport as of December 2025.

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.

$38 Cheap Flights from Seattle to Denver in 2025/26

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Cheap round-trip flights

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12:19 pm - 4:10 pm

SEA

DEN

2h 51mnonstop

12:34 pm - 2:43 pm

DEN

SEA

3h 09mnonstop

$72Frontier

Fri, Jan 16 - Sat, Jan 17

12:19 pm - 4:10 pm

SEA

DEN

2h 51mnonstop

9:00 am - 11:09 am

DEN

SEA

3h 09mnonstop

$73Frontier

Fri, Jan 16 - Sun, Jan 18

3:58 pm - 7:46 pm

SEA

DEN

2h 48mnonstop

7:00 am - 9:11 am

DEN

SEA

3h 11mnonstop

$74Multiple Airlines

Sat, Jan 17 - Sat, Jan 24

2:49 pm - 6:38 pm

SEA

DEN

2h 49mnonstop

5:09 pm - 7:15 pm

DEN

SEA

3h 06mnonstop

$76Multiple Airlines

Sat, Jan 10 - Mon, Jan 12

7:54 pm - 11:35 pm

SEA

DEN

2h 41mnonstop

11:24 am - 1:34 pm

DEN

SEA

3h 10mnonstop

$77Multiple Airlines

Wed, Jan 7 - Sat, Jan 10

2:54 pm - 6:43 pm

SEA

DEN

2h 49mnonstop

7:00 am - 9:11 am

DEN

SEA

3h 11mnonstop

$78Multiple Airlines

Mon, Jan 5 - Wed, Jan 7

12:34 pm - 4:25 pm

SEA

DEN

2h 51mnonstop

11:49 am - 6:43 pm

DEN

SEA

7h 54m1 stop

$79Multiple Airlines

Thu, Feb 5 - Mon, Feb 9

7:54 pm - 11:35 pm

SEA

DEN

2h 41mnonstop

9:10 am - 11:21 am

DEN

SEA

3h 11mnonstop

$82Multiple Airlines

Wed, Jan 7 - Sun, Jan 11

3:58 pm - 7:46 pm

SEA

DEN

2h 48mnonstop

9:00 am - 11:09 am

DEN

SEA

3h 09mnonstop

$83Frontier

Sat, Jan 17 - Mon, Jan 19

12:19 pm - 4:10 pm

SEA

DEN

2h 51mnonstop

5:09 pm - 7:15 pm

DEN

SEA

3h 06mnonstop

$84Multiple Airlines

Thu, Jan 15 - Sat, Jan 17

Alaska Airlines flights from Seattle to Denver

Our best Alaska Airlines deals on Seattle to Denver flight tickets

Alaska Airlines

Jan 10

SEA7:54 pmSeattle/Tacoma Intl

2h 41m

DEN11:35 pmDenver Intl

Jan 11

DEN7:00 amDenver Intl

3h 11m

SEA9:11 amSeattle/Tacoma Intl

$89

Find similar

Alaska Airlines

Jan 9

SEA7:54 pmSeattle/Tacoma Intl

2h 41m

DEN11:35 pmDenver Intl

Jan 13

DEN5:09 pmDenver Intl

3h 06m

SEA7:15 pmSeattle/Tacoma Intl

$97

Find similar

Alaska Airlines

Jan 4

SEA8:17 pmSeattle/Tacoma Intl

2h 42m

DEN11:59 pmDenver Intl

Jan 6

DEN11:31 amDenver Intl

5h 30m

1 stop

SEA4:01 pmSeattle/Tacoma Intl

$108

Find similar

Frontier flights from Seattle to Denver

Our best Frontier deals on Seattle to Denver flight tickets

Frontier

Jan 16

SEA12:19 pmSeattle/Tacoma Intl

2h 51m

DEN4:10 pmDenver Intl

Jan 17

DEN12:34 pmDenver Intl

3h 09m

SEA2:43 pmSeattle/Tacoma Intl

$72

Find similar

Frontier

Jan 11

SEA12:26 pmSeattle/Tacoma Intl

2h 51m

DEN4:17 pmDenver Intl

Jan 17

DEN12:34 pmDenver Intl

3h 09m

SEA2:43 pmSeattle/Tacoma Intl

$73

Find similar

Frontier

Jan 29

SEA12:34 pmSeattle/Tacoma Intl

2h 51m

DEN4:25 pmDenver Intl

Jan 31

DEN10:49 pmDenver Intl

12h 57m

1 stop

SEA10:46 amSeattle/Tacoma Intl

$93

Find similar

Fly from

Fly to

Route

Depart

Return

Price

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Fri 1/16

12:19 pm-4:10 pm

Nonstop2h 51m

Denver Intl

Sat 1/17

12:34 pm-2:43 pm

Nonstop3h 09m

$72

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Fri 1/16

12:19 pm-4:10 pm

Nonstop2h 51m

Denver Intl

Sun 1/18

9:00 am-11:09 am

Nonstop3h 09m

$73

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Sat 1/17

3:58 pm-7:46 pm

Nonstop2h 48m

Denver Intl

Sat 1/24

7:00 am-9:11 am

Nonstop3h 11m

$74

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Sat 1/10

2:49 pm-6:38 pm

Nonstop2h 49m

Denver Intl

Mon 1/12

5:09 pm-7:15 pm

Nonstop3h 06m

$76

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Wed 1/7

7:54 pm-11:35 pm

Nonstop2h 41m

Denver Intl

Sat 1/10

11:24 am-1:34 pm

Nonstop3h 10m

$77

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Mon 1/5

2:54 pm-6:43 pm

Nonstop2h 49m

Denver Intl

Wed 1/7

7:00 am-9:11 am

Nonstop3h 11m

$78

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Thu 2/5

12:34 pm-4:25 pm

Nonstop2h 51m

Denver Intl

Mon 2/9

11:49 am-6:43 pm

1 stop7h 54m

$79

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Wed 1/7

7:54 pm-11:35 pm

Nonstop2h 41m

Denver Intl

Sun 1/11

9:10 am-11:21 am

Nonstop3h 11m

$82

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Sat 1/17

3:58 pm-7:46 pm

Nonstop2h 48m

Denver Intl

Mon 1/19

9:00 am-11:09 am

Nonstop3h 09m

$83

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Thu 1/15

12:19 pm-4:10 pm

Nonstop2h 51m

Denver Intl

Sat 1/17

5:09 pm-7:15 pm

Nonstop3h 06m

$84

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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

Prices

Airlines

Delays

Other information

What is the cheapest month to fly to Denver?

The cheapest month to fly to Denver from Seattle is in January. Flight prices, which tend to average around $187, are often lower during this time because this is during the off-season. If you don’t want to visit Denver in January, then you should wait until October to fly from Seattle, when ticket prices are also cheap, with an average price of $196.

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 Friday when prices can be found for as low as $274. 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 $343.

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

The cheapest time of day to fly to Denver is at noon when flights can be purchased for as low as $236. Flights in the morning are often more expensive with an average ticket price of $330.

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 $216 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 $173 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 December 2025, prices for Seattle to Denver flights are approximately 26% 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	$115
Fastest flight time	2h 42m
Direct flights	Every day
Airports in Denver	1 airport

The best one-way flight to Denver from Seattle in the past 72 hours is $115. The best round-trip flight deal from Seattle to Denver found on momondo in the last 72 hours is $206.

The fastest flight from Seattle to Denver takes 2h 42m

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 35m, 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?
There are 6 operators available for flights from Seattle/Tacoma Intl Airport to Denver Intl Airport as of December 2025.
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?
momondo data reveals that the most frequently booked plane model on the route from Seattle to Denver is Boeing 737 MAX 9, representing 13.11% of all bookings. The subsequent popular models are Airbus A321neo at 12.18%, Boeing 737-800 Passenger/BBJ2 (winglets) at 11.58%, and Boeing 737-900 at 10.26%.
What is the most popular airline from Seattle to Denver?
Based on momondo bookings for flights between Seattle and Denver, the leading airline is Frontier, making up 39% of the total bookings. Other popular airlines include Delta with 20%, Alaska Airlines with 18%, and United Airlines with 13%.

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
Frontier	PriceFrom $66	Free Cancellation	Rating 5.8 3,090 reviews	Search Frontier flights
Hawaiian Airlines	PriceFrom $87	Free Cancellation	Rating 7.8 2,817 reviews	Search Hawaiian Airlines flights
Delta	PriceFrom $116	Free Cancellation	Rating 7.9 8,011 reviews	Search Delta flights
Southwest	PriceFrom $118	Free Cancellation	Rating 8.0 4,250 reviews	Search Southwest flights
United Airlines	PriceFrom $150	Free Cancellation	Rating 7.4 9,066 reviews	Search United Airlines flights
Alaska Airlines	PriceFrom $158	Free Cancellation	Rating 8.0 11,402 reviews	Search Alaska Airlines flights

Southwest Flights From Seattle to Denver
Southwest operates around 15 flights from Seattle to Denver every week. The average price of these flights found in the last 72 hours has been $257, but momondo users have found Southwest deals from Seattle to Denver from as low as $118 round-trip. Southwest has been scored 8.0/10 in 4,250 reviews.
Alaska Airlines Flights From Seattle to Denver
Across 11,402 Alaska Airlines reviews on momondo, the average score is 8.0/10. Alaska Airlines flies from Seattle to Denver about 17 times each week, with ticket deals ranging from $158 to $302. Price data is based on momondo searches in the last 72 hours.

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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.

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Cheap flights from Seattle to Denver from $38

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 1/1. 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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Alaska Airlines flights from Seattle to Denver

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Frontier flights from Seattle to Denver

Our best Frontier deals on Seattle to Denver flight tickets

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Use the filters below to find and compare flights from Seattle to Denver that are best for you.

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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?

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 Friday when prices can be found for as low as $274. 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 $343.

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

The cheapest time of day to fly to Denver is at noon when flights can be purchased for as low as $236. Flights in the morning are often more expensive with an average ticket price of $330.

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?

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 December 2025, prices for Seattle to Denver flights are approximately 26% more expensive when compared to flights at the same time last year.

What is the cheapest airline that flies from Seattle/Tacoma Intl to Denver Intl?

Southwest and Delta are the most popular carriers operating from Seattle/Tacoma Intl to Denver Intl

What airlines fly to Denver?

How often are flights from Seattle to Denver delayed?

Historically, on average around 18% of flights between Seattle and Denver have experienced a delay on any given week. The average delay length over the past 12 months has been 134 minutes.

What is the most punctual flight time for Seattle to Denver flights?

Generally, flights departing at night tend to experience fewer delays. Flights in the early afternoon have, in the past, seen delays more frequently in comparison.

What day of the week experiences the fewest flight delays on this route?

Saturday is statistically the day of the week which experiences the fewest number of delays on this flight route. Sunday has historically seen more delays on average compared to the rest of the week.

Which airline has the best punctuality record on Seattle to Denver flights?

According to our data, United Airlines have had the least number of delays on this route over the last 12 months; with about 10% of their flights experiencing any sort of delay.

How many flights depart from Seattle to Denver on average per day?

The number of flights available between Seattle and Denver is 19 per day as of December 2025. The most frequent departure time is 3:00PM, with 45% of daily flights leaving in the afternoon.

How many flights depart from Seattle to Denver on average per week?

As of December 2025, there are 137 flights per week flying from Seattle to Denver. The most common day of the week flights depart is Wed, with 22% of flights taking off on this day.

When to book flights from Seattle to Denver

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

Fastest flight time

Direct flights

Airports in Denver

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

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

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?

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

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

Southwest Flights From Seattle to Denver

Alaska Airlines Flights From Seattle to Denver

Traveling to a place near Denver?

Why use momondo?

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

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

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

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

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.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to the United States