Find Cheap Flights from Denver International to Seattle/Tacoma Intl (DEN - SEA)

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Wed 2/21
Wed 2/28
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Good to Know

Low Season:
October
Best time to beat the crowds
3%
expected price decrease
High Season:
July
Most popular time to fly
10%
expected price increase
Average Price:
$204
(avg. price over the last 2 weeks)
Good Deal:
$151
or less (round trip)

When to Book Flights from Denver International to Seattle/Tacoma Intl

Average price per month
Flight prices as travel date approaches
-1 day
-2 days

Top tips for Finding a Cheap Flight

Looking for a cheap flight? 25% of our users found flights on this route for $150 or less.
The cheapest flight from Denver International to Seattle/Tacoma Intl was found 29 days before departure, on average.
Book at least 2 weeks before departure in order to get a below-average price.
High season is considered to be June, July and August. The cheapest month to fly is October.
Morning departure is around 16% cheaper than an evening flight, on average*.
*Average of the lowest prices shown in KAYAK’s search results for departures within the next 30 days

FAQs for Booking Denver International to Seattle/Tacoma Intl Flights

How long does a flight from Denver International to Seattle/Tacoma Intl take?
An average nonstop flight takes 2h 56m, covering a distance of 1022 miles.
How many flights are there between Denver International and Seattle/Tacoma Intl?
There are 600 (nonstop) flights between Denver International and Seattle/Tacoma Intl per week, averaging 90 per day.
Which airlines provide the cheapest flights from Denver International to Seattle/Tacoma Intl?
In the past 3 days, the cheapest round-trip tickets were found on Multiple Airlines ($97), United ($97) and Frontier ($97).
Do I need a passport to fly between Denver International and Seattle/Tacoma Intl?
No.
Which airlines fly most frequently between Denver International and Seattle/Tacoma Intl?
Alaska Airlines (17 times daily), United (12 times daily), Delta (10 times daily) are the most frequent flyers on this route.
What’s the cheapest day of the week to fly Denver International to Seattle/Tacoma Intl?
For Denver International to Seattle/Tacoma Intl, Tuesday is the cheapest day to fly on average and Sunday is the most expensive. Flying from Seattle/Tacoma Intl back to Denver International, the best deals are generally found on Monday, with Tuesday being the most expensive.

Book cheap flights from Denver International to Seattle/Tacoma Intl (round-trip)

Airports
Origin
Denver
$97
only
$97
Destination
Seattle
$97
only
$97
Tue, Mar 6
DEN
SEA
2h 59m
Wed, Mar 14
SEA
DEN
2h 41m
Trip: 8 days
Overall 0.0 Poor
Based on 0 reviews
Wed, Mar 7
DEN
SEA
2h 59m
Wed, Mar 21
SEA
DEN
2h 37m
Trip: 14 days
7.1GoodShow reviews
Overall 7.1 Good
Based on 100 reviews
Overall
7.2
Boarding
7.4
Comfort
7.0
Crew
7.7
Entertainment
6.5
Food
6.4
DEN
SEA
Mediocre 3.6

Seats are very uncomfortable the delay was unexplained and no information was givenuntil we boarded the plane

DEN
SEA
Mediocre 2.0

I'd have to say poor since I'm still stuck in Denver.

DEN
SEA
Okay 4.8

Flight was already scheduled to get in late--around midnight. Didn't get in until ~2 am.

DEN
SEA
Okay 5.3

Again board from back to front....would have been nice to know to bring headfones with me so I could have watched a movie in my device, usually they play a movie for all.

DEN
SEA
Good 6.0

Premium economy is a must for me from now on. I am 6'4" and the extra leg room makes all the difference in the world. My flight was at night so I had little interaction with the crew. Overall I had a very pleasant experience on united and would definitely fly with them again.

Food options were limited to snack boxes. I had a layover in Denver. At the time of my arrival all of the food options in the Denver airport were closed. I would have appreciated some more substantial food offerings on the plane, as I had to go without dinner thatnight.

Tue, Apr 3
DEN
SEA
2h 58m
Mon, Apr 23
SEA
DEN
2h 38m
Trip: 21 days
4.8OkayShow reviews
Overall 4.8 Okay
Based on 390 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
DEN
SEA
Okay 4.3

I was told I MUST pay for my carry on and the woman at the gate told me it was unnecessary, after forking over $45. Also, water cost money on the flight. I felt mislead.

DEN
SEA
Excellent 8.0

Crew was friendly, take off and landing were good!

Just a general observation I notice the more I travel...I really wish they would stop making the aisles of planes so small!

DEN
SEA
Okay 5.0

Cheap tickets

You must experience the rigid, non-reclining seats packed impossibly close together to get the full Frontier experience. Nonetheless they often have the cheapest airfare so what is a budget traveler to do?

DEN
SEA
Excellent 10.0

The same

DEN
SEA
Mediocre 3.3

They still pick up trash!!

New airbus has even LESS room!! Have to manhandle your personal bag out of the even smaller space under the seat! A soda is $3! There is Nothing to read anymore and the crew are overwhelmed with cranky people... making them cranky.

Wed, Mar 7
DEN
SEA
3h 03m
Wed, Mar 14
SEA
DEN
2h 41m
Trip: 7 days
Overall 0.0 Poor
Based on 0 reviews
Wed, Apr 4
DEN
SEA
3h 01m
Mon, Apr 23
SEA
DEN
2h 38m
Trip: 20 days
4.8OkayShow reviews
Overall 4.8 Okay
Based on 390 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
DEN
SEA
Mediocre 2.0

DID NOT like having to wait in Denver airport for the scheduled 9 hour layover and then delayed for another 1.5 hour for a total of 10+ hours. DID NOT like getting lured into a great schedule in March and then in May you cancelled the flight and we had a 9 + hour layover. TERRIBLE. Will never fly with Frontier again. :(

DEN
SEA
Excellent 8.0

I was last on and only the 1st class was open so free upgrade

No complimentary snacks

DEN
SEA
Okay 5.3

The crew

The web page to bundle was very hard to manover Wasn't asked about payment for my carry on till it was to late How and when can you bundle?

DEN
SEA
Mediocre 3.3

They still pick up trash!!

New airbus has even LESS room!! Have to manhandle your personal bag out of the even smaller space under the seat! A soda is $3! There is Nothing to read anymore and the crew are overwhelmed with cranky people... making them cranky.

DEN
SEA
Excellent 10.0

The same

Wed, Mar 7
DEN
SEA
3h 03m
Wed, Mar 14
SEA
DEN
2h 41m
Trip: 7 days
Overall 0.0 Poor
Based on 0 reviews
Wed, Apr 11
DEN
SEA
3h 05m
Wed, Apr 18
SEA
DEN
2h 37m
Trip: 8 days
4.8OkayShow reviews
Overall 4.8 Okay
Based on 390 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
DEN
SEA
Okay 5.0

Cheap tickets

You must experience the rigid, non-reclining seats packed impossibly close together to get the full Frontier experience. Nonetheless they often have the cheapest airfare so what is a budget traveler to do?

DEN
SEA
Okay 4.3

I was told I MUST pay for my carry on and the woman at the gate told me it was unnecessary, after forking over $45. Also, water cost money on the flight. I felt mislead.

DEN
SEA
Okay 4.0

Didn't crash

Most uncomfortable seats and flight was late

DEN
SEA
Okay 5.0

As above.

As above

DEN
SEA
Okay 5.3

The crew

The web page to bundle was very hard to manover Wasn't asked about payment for my carry on till it was to late How and when can you bundle?

Sun, Mar 11
DEN
SEA
2h 59m
Wed, Mar 21
SEA
DEN
2h 37m
Trip: 10 days
7.1GoodShow reviews
Overall 7.1 Good
Based on 100 reviews
Overall
7.2
Boarding
7.4
Comfort
7.0
Crew
7.7
Entertainment
6.5
Food
6.4
DEN
SEA
Good 6.0

Premium economy is a must for me from now on. I am 6'4" and the extra leg room makes all the difference in the world. My flight was at night so I had little interaction with the crew. Overall I had a very pleasant experience on united and would definitely fly with them again.

Food options were limited to snack boxes. I had a layover in Denver. At the time of my arrival all of the food options in the Denver airport were closed. I would have appreciated some more substantial food offerings on the plane, as I had to go without dinner thatnight.

DEN
SEA
Okay 5.3

Again board from back to front....would have been nice to know to bring headfones with me so I could have watched a movie in my device, usually they play a movie for all.

DEN
SEA
Excellent 10.0

I was supposed to be the volunteer for overbooking problem, but the ground attendent helped me by arranging a seat for me. If she didn't do that, I would miss my next international flight. I'd like to say thanks here!

DEN
SEA
Okay 5.0

Crew were friendly and helpful

Seats are very tight. Entertainment depends on bringing your own ipad or laptop and using the United system. Movies tended to be oldies. Food is 10 pretzels. Count them.

DEN
SEA
Mediocre 2.0

Nothing

Tried to cancel flight significantly ahead of time due to change in my military duties and was offered $0 because all of the fees and charges far exceeded the cost of the tickets. Very unhappy with United.

Tue, Mar 13
DEN
SEA
3h 04m
Wed, Mar 14
SEA
DEN
2h 41m
Trip: 2 days
Overall 0.0 Poor
Based on 0 reviews
Tue, Mar 13
DEN
SEA
3h 04m
Thu, Mar 22
SEA
DEN
2h 37m
Trip: 10 days
7.1GoodShow reviews
Overall 7.1 Good
Based on 100 reviews
Overall
7.2
Boarding
7.4
Comfort
7.0
Crew
7.7
Entertainment
6.5
Food
6.4
DEN
SEA
Good 6.6

Support for all Android platforms needs to be updated.

DEN
SEA
Okay 4.8

Flight was already scheduled to get in late--around midnight. Didn't get in until ~2 am.

DEN
SEA
Mediocre 2.0

Nothing

Tried to cancel flight significantly ahead of time due to change in my military duties and was offered $0 because all of the fees and charges far exceeded the cost of the tickets. Very unhappy with United.

DEN
SEA
Good 6.0

Premium economy is a must for me from now on. I am 6'4" and the extra leg room makes all the difference in the world. My flight was at night so I had little interaction with the crew. Overall I had a very pleasant experience on united and would definitely fly with them again.

Food options were limited to snack boxes. I had a layover in Denver. At the time of my arrival all of the food options in the Denver airport were closed. I would have appreciated some more substantial food offerings on the plane, as I had to go without dinner thatnight.

DEN
SEA
Okay 5.0

Crew were friendly and helpful

Seats are very tight. Entertainment depends on bringing your own ipad or laptop and using the United system. Movies tended to be oldies. Food is 10 pretzels. Count them.

Wed, Mar 14
DEN
SEA
3h 01m
Wed, Mar 21
SEA
DEN
2h 37m
Trip: 8 days
Overall 0.0 Poor
Based on 0 reviews
Tue, Apr 3
DEN
SEA
2h 58m
Wed, Apr 11
SEA
DEN
2h 37m
Trip: 9 days
4.8OkayShow reviews
Overall 4.8 Okay
Based on 390 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
DEN
SEA
Good 7.6

Good fare nice crew

DEN
SEA
Excellent 8.0

Crew was friendly, take off and landing were good!

Just a general observation I notice the more I travel...I really wish they would stop making the aisles of planes so small!

DEN
SEA
Mediocre 3.3

They still pick up trash!!

New airbus has even LESS room!! Have to manhandle your personal bag out of the even smaller space under the seat! A soda is $3! There is Nothing to read anymore and the crew are overwhelmed with cranky people... making them cranky.

DEN
SEA
Okay 4.0

Didn't crash

Most uncomfortable seats and flight was late

DEN
SEA
Okay 4.3

I was told I MUST pay for my carry on and the woman at the gate told me it was unnecessary, after forking over $45. Also, water cost money on the flight. I felt mislead.

Tue, Apr 3
DEN
SEA
2h 59m
Wed, Apr 11
SEA
DEN
2h 37m
Trip: 9 days
Overall 0.0 Poor
Based on 0 reviews
Mon, Apr 9
DEN
SEA
3h 05m
Wed, Apr 11
SEA
DEN
2h 37m
Trip: 3 days
4.8OkayShow reviews
Overall 4.8 Okay
Based on 390 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
DEN
SEA
Excellent 8.0

Crew was friendly, take off and landing were good!

Just a general observation I notice the more I travel...I really wish they would stop making the aisles of planes so small!

DEN
SEA
Okay 4.3

I was told I MUST pay for my carry on and the woman at the gate told me it was unnecessary, after forking over $45. Also, water cost money on the flight. I felt mislead.

DEN
SEA
Okay 5.0

As above.

As above

DEN
SEA
Okay 5.3

The crew

The web page to bundle was very hard to manover Wasn't asked about payment for my carry on till it was to late How and when can you bundle?

DEN
SEA
Mediocre 2.0

The fact the flight was only a bearable 2 hours

The ticket was $30, but then taxes and fees were $43. That's just the start of the money trap...to have a carry on- $60 To check your bag- $45 Then to "reserve your seat" it's any where from $14- $30. The seats didn't even recline. Then during the flight everything costs money, even WATER! I will never fly Frontier again unless I'm desperate...I mean, REALLY DESPERATE!

Tue, Mar 13
DEN
SEA
3h 04m
Wed, Mar 14
SEA
DEN
6h 16m
Trip: 2 days
7.1GoodShow reviews
Overall 7.1 Good
Based on 100 reviews
Overall
7.2
Boarding
7.4
Comfort
7.0
Crew
7.7
Entertainment
6.5
Food
6.4
DEN
SEA
Mediocre 3.6

Seats are very uncomfortable the delay was unexplained and no information was givenuntil we boarded the plane

DEN
SEA
Okay 4.0

Delays

DEN
SEA
Good 6.6

Support for all Android platforms needs to be updated.

DEN
SEA
Excellent 10.0

Didn't disturb us

DEN
SEA
Excellent 10.0

I was supposed to be the volunteer for overbooking problem, but the ground attendent helped me by arranging a seat for me. If she didn't do that, I would miss my next international flight. I'd like to say thanks here!

Wed, Apr 4
DEN
SEA
3h 03m
Tue, Apr 10
SEA
DEN
2h 44m
Trip: 7 days
Overall 0.0 Poor
Based on 0 reviews
Wed, Apr 11
DEN
SEA
3h 05m
Wed, Apr 18
SEA
DEN
2h 37m
Trip: 8 days
4.8OkayShow reviews
Overall 4.8 Okay
Based on 390 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
DEN
SEA
Mediocre 2.0

DID NOT like having to wait in Denver airport for the scheduled 9 hour layover and then delayed for another 1.5 hour for a total of 10+ hours. DID NOT like getting lured into a great schedule in March and then in May you cancelled the flight and we had a 9 + hour layover. TERRIBLE. Will never fly with Frontier again. :(

DEN
SEA
Okay 5.0

Cheap tickets

You must experience the rigid, non-reclining seats packed impossibly close together to get the full Frontier experience. Nonetheless they often have the cheapest airfare so what is a budget traveler to do?

DEN
SEA
Okay 4.0

Didn't crash

Most uncomfortable seats and flight was late

DEN
SEA
Okay 5.3

The crew

The web page to bundle was very hard to manover Wasn't asked about payment for my carry on till it was to late How and when can you bundle?

DEN
SEA
Mediocre 3.3

They still pick up trash!!

New airbus has even LESS room!! Have to manhandle your personal bag out of the even smaller space under the seat! A soda is $3! There is Nothing to read anymore and the crew are overwhelmed with cranky people... making them cranky.

Tue, Apr 3
DEN
SEA
2h 58m
Sat, Apr 21
SEA
DEN
2h 37m
Trip: 19 days
4.8OkayShow reviews
Overall 4.8 Okay
Based on 390 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
DEN
SEA
Okay 4.0

Didn't crash

Most uncomfortable seats and flight was late

DEN
SEA
Okay 5.0

As above.

As above

DEN
SEA
Mediocre 2.0

DID NOT like having to wait in Denver airport for the scheduled 9 hour layover and then delayed for another 1.5 hour for a total of 10+ hours. DID NOT like getting lured into a great schedule in March and then in May you cancelled the flight and we had a 9 + hour layover. TERRIBLE. Will never fly with Frontier again. :(

DEN
SEA
Okay 5.0

Cheap tickets

You must experience the rigid, non-reclining seats packed impossibly close together to get the full Frontier experience. Nonetheless they often have the cheapest airfare so what is a budget traveler to do?

DEN
SEA
Okay 5.3

The crew

The web page to bundle was very hard to manover Wasn't asked about payment for my carry on till it was to late How and when can you bundle?

Fri, Mar 2
DEN
SEA
2h 56m
Wed, Mar 7
SEA
DEN
2h 38m
Trip: 6 days
Overall 0.0 Poor
Based on 0 reviews
Wed, Apr 4
DEN
SEA
2h 56m
Sat, Apr 21
SEA
DEN
2h 37m
Trip: 18 days
4.8OkayShow reviews
Overall 4.8 Okay
Based on 390 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
DEN
SEA
Mediocre 2.0

The fact the flight was only a bearable 2 hours

The ticket was $30, but then taxes and fees were $43. That's just the start of the money trap...to have a carry on- $60 To check your bag- $45 Then to "reserve your seat" it's any where from $14- $30. The seats didn't even recline. Then during the flight everything costs money, even WATER! I will never fly Frontier again unless I'm desperate...I mean, REALLY DESPERATE!

DEN
SEA
Okay 5.0

As above.

As above

DEN
SEA
Excellent 10.0

The same

DEN
SEA
Mediocre 3.3

They still pick up trash!!

New airbus has even LESS room!! Have to manhandle your personal bag out of the even smaller space under the seat! A soda is $3! There is Nothing to read anymore and the crew are overwhelmed with cranky people... making them cranky.

DEN
SEA
Excellent 8.0

I was last on and only the 1st class was open so free upgrade

No complimentary snacks

Show more results

Denver International to Seattle/Tacoma Intl Flight Information

Avg. Flight Duration 2h 49m
Flights Arrive in Seattle/Tacoma Intl
Flights Depart from Denver International
Flight Price $97
Distance 1022 miles
Airlines United, Frontier
*
Prices are per person and are for e–tickets and include all taxes & fees in USD.

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Prices on airline seats, hotel rooms and car rentals can change frequently. Several people may also be trying to buy the same travel option simultaneously. As a result, you may find, on occasion, that certain prices are no longer available.

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The fares displayed include all taxes and fees for economy class travel and were found by the provider in the last 72 hours. Seats are limited and may not be available on all flights and days. Fares are subject to change and may not be available on all flights or dates of travel. Some carriers charge additional fees for extra checked bags. Please check the carriers' sites.