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

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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
11%
expected price increase
Average Price:
$230
(avg. price over the last 2 weeks)
Good Deal:
$154
or less (round trip)

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

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 $154 or less.
The cheapest flight from Seattle/Tacoma Intl to Denver International was found 72 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 14% 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 Seattle/Tacoma Intl to Denver International Flights

How long does a flight from Seattle/Tacoma Intl to Denver International take?
An average nonstop flight takes 2h 38m, covering a distance of 1022 miles.
How many flights are there between Seattle/Tacoma Intl and Denver International?
There are 614 (nonstop) flights between Seattle/Tacoma Intl and Denver International per week, averaging 89 per day.
Which airlines provide the cheapest flights from Seattle/Tacoma Intl to Denver International?
In the past 3 days, the cheapest round-trip tickets were found on Frontier ($67), Multiple Airlines ($97) and Delta ($137).
Do I need a passport to fly between Seattle/Tacoma Intl and Denver International?
No.
Which airlines fly most frequently between Seattle/Tacoma Intl and Denver International?
Alaska Airlines (15 times daily), United (13 times daily), Delta (12 times daily) are the most frequent flyers on this route.
What’s the cheapest day of the week to fly Seattle/Tacoma Intl to Denver International?
For Seattle/Tacoma Intl to Denver International, Tuesday is the cheapest day to fly on average and Thursday is the most expensive. Flying from Denver International back to Seattle/Tacoma Intl, the best deals are generally found on Wednesday, with Thursday being the most expensive.

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

Airports
Origin
Seattle
$67
only
$67
Destination
Denver
$67
only
$67
Tue, Jan 30
SEA
DEN
2h 38m
Wed, Feb 7
DEN
SEA
3h 07m
Trip: 9 days
4.9OkayShow reviews
Overall 4.9 Okay
Based on 464 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
SEA
DEN
Mediocre 3.6

Crew was entertaining

Second most uncomfortable plane I've ever been on. Most uncomfortable was the frontier transfer directly after.

SEA
DEN
Mediocre 2.3

Not much

Cost of bags, not understanding person in terminal during boarding, plane seats; I keep saying we will NOT Frontier again. I must have been desperate.

SEA
DEN
Good 7.3

Price

I like to get to the airport early. It's always a gamble with what the TSA lines will be. So extra time get through and enjoy some food with no rush. Had to wait for over a hour just to check on our bag.

SEA
DEN
Mediocre 3.0

Didn't crash

All flights were late, seats were extremely uncomfortable.

SEA
DEN
Mediocre 2.6

hmm

layover nothing was in order staff sucked yall kept moving gate yall could at lest give us a soda for the long rides

Thu, Feb 1
SEA
DEN
2h 38m
Wed, Feb 7
DEN
SEA
3h 07m
Trip: 7 days
Overall 0.0 Poor
Based on 0 reviews
Fri, Feb 9
SEA
DEN
2h 46m
Sun, Feb 11
DEN
SEA
3h 23m
Trip: 3 days
8.5ExcellentShow reviews
Overall 8.5 Excellent
Based on 10 reviews
Overall
8.0
Boarding
8.1
Comfort
7.7
Crew
8.4
Entertainment
7.5
Food
7.3
SEA
DEN
Good 6.3

I love the new snack choices! Way to go Delta for offering Kind bars now!! This is awesome.

Tiny old plane, props blocked my window view, no entertainment system.

CMH
ATL
Okay 5.0

As poltronas estavam OK.

No voo MEX-GRU o Sistema de Entretenimento nao funcionou por quase 3hs. A refeicao foi muito fraca, tamto no jantar quanto no café da manhã. Onde ja se viu comer feijão preto com onelete no cafe da manhã??? Deveriam pensar no tipo de passageiro q estao atendendo.

SEA
DEN
Excellent 10.0

The staff of the flight were very friendly and attentive. They were great!

SEA
DEN
Good 6.0

Seats were uncomfortable

BNA
BOS
Mediocre 2.0

Delta staff taking care of rude/beligerant guests first vedore guests patiently/kindly waiting in line ... children watched that behavior and the jerks recieved special treatment. Flight staff ripped up guests boarding pass in face. Staff allowed ys to board plane and put our bags under plane and then crew timed out before take off. Never will use Delta again.

Sat, Feb 3
SEA
DEN
2h 38m
Wed, Feb 7
DEN
SEA
3h 07m
Trip: 5 days
4.9OkayShow reviews
Overall 4.9 Okay
Based on 464 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
SEA
DEN
Mediocre 2.0

I was notified of my flight departing Seattle was delayed resulting in it being impossible for me to make my connecting flight in Denver to Philadelphia hence missing an entire 24 hours I could’ve spent with my family and loosing vacation time. Frontier has not done anything to compensate me for the inconvenience.

SEA
DEN
Good 7.3

Price

I like to get to the airport early. It's always a gamble with what the TSA lines will be. So extra time get through and enjoy some food with no rush. Had to wait for over a hour just to check on our bag.

SEA
DEN
Mediocre 2.0

Nothing positive

I wasn't allowed to board because they closed the flight. I didn't realize you have to pay an additional fee to get your seat assignement to even get on the flight. I've been delayed a full 24hrs. That on top of $40 fee to have my carry on. At this point, my $175 plane ticket has ballooned to almost $245 which is more expensive than other flights where they treat you like a human being. F this company.

SEA
DEN
Mediocre 3.6

Crew was entertaining

Second most uncomfortable plane I've ever been on. Most uncomfortable was the frontier transfer directly after.

SEA
DEN
Mediocre 2.3

Not much

Cost of bags, not understanding person in terminal during boarding, plane seats; I keep saying we will NOT Frontier again. I must have been desperate.

Wed, May 9
SEA
DEN
2h 51m
Wed, Jun 6
DEN
SEA
2h 55m
Trip: 29 days
4.9OkayShow reviews
Overall 4.9 Okay
Based on 464 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
SEA
DEN
Mediocre 2.0

Not a single thing

Staff is rude and incompetent, they way over charged my account for for services that weren’t even available but wasn’t told this until after they charged my card. Seriously considering taking my experience with them to local news outlets so this doesn’t happen to anyone else !!

SEA
DEN
Mediocre 3.3

Good connection, timely departure, pleasant crew

Budget airline ended up being much more expensive than my usual airlines. $40 per bag per leg of the trip, including carry-on?! My wife and I each had one carry on bag (normally free). Since we had a connection each direction that's $40 x 2 (people) x 4 flights = $320. That's ridiculous. Furthermore, these were the worst seating conditions on any airline I've ever seen (and I fly plenty). There is no headrest - the seats barely make it to my shoulders. And the seats themselves have no cushion whatsoever. The tray tables are laughably miniscule - much smaller than my laptop. There is no free snack/beverage or in-flight entertainment. There is no wifi. I will stick to United or Delta in the future.

SEA
DEN
Mediocre 3.0

Didn't crash

All flights were late, seats were extremely uncomfortable.

SEA
DEN
Excellent 8.0

Great flight attendants, amazing landing in Denver.

It was delayed. But I appreciated the meal voucher and voucher for future travel.

SEA
DEN
Mediocre 2.6

hmm

layover nothing was in order staff sucked yall kept moving gate yall could at lest give us a soda for the long rides

Wed, Feb 7
SEA
DEN
2h 38m
Thu, Feb 8
DEN
SEA
2h 59m
Trip: 2 days
Overall 0.0 Poor
Based on 0 reviews
Wed, Apr 25
SEA
DEN
2h 41m
Sat, Apr 28
DEN
SEA
2h 58m
Trip: 4 days
4.9OkayShow reviews
Overall 4.9 Okay
Based on 464 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
SEA
DEN
Good 7.3

Price

I like to get to the airport early. It's always a gamble with what the TSA lines will be. So extra time get through and enjoy some food with no rush. Had to wait for over a hour just to check on our bag.

SEA
DEN
Good 7.3

They had us pay 45 dollars per carry on bag. CARRY ON BAG..... I was very disappointed. Who does this? I guess frontier. Won't be flying with them again.

SEA
DEN
Mediocre 2.0

Nothing positive

I wasn't allowed to board because they closed the flight. I didn't realize you have to pay an additional fee to get your seat assignement to even get on the flight. I've been delayed a full 24hrs. That on top of $40 fee to have my carry on. At this point, my $175 plane ticket has ballooned to almost $245 which is more expensive than other flights where they treat you like a human being. F this company.

SEA
DEN
Mediocre 2.0

I was notified of my flight departing Seattle was delayed resulting in it being impossible for me to make my connecting flight in Denver to Philadelphia hence missing an entire 24 hours I could’ve spent with my family and loosing vacation time. Frontier has not done anything to compensate me for the inconvenience.

SEA
DEN
Mediocre 2.0

Not a single thing

Staff is rude and incompetent, they way over charged my account for for services that weren’t even available but wasn’t told this until after they charged my card. Seriously considering taking my experience with them to local news outlets so this doesn’t happen to anyone else !!

Wed, Jan 31
SEA
DEN
2h 38m
Sat, Feb 10
DEN
SEA
3h 01m
Trip: 11 days
Overall 0.0 Poor
Based on 0 reviews
Sat, Mar 3
SEA
DEN
2h 41m
Tue, Mar 13
DEN
SEA
2h 58m
Trip: 10 days
4.9OkayShow reviews
Overall 4.9 Okay
Based on 464 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
SEA
DEN
Mediocre 2.6

hmm

layover nothing was in order staff sucked yall kept moving gate yall could at lest give us a soda for the long rides

SEA
DEN
Mediocre 2.0

Not a single thing

Staff is rude and incompetent, they way over charged my account for for services that weren’t even available but wasn’t told this until after they charged my card. Seriously considering taking my experience with them to local news outlets so this doesn’t happen to anyone else !!

SEA
DEN
Excellent 8.6

boarding/unboarding is painless and enjoyable and attendants are respectfull

snacks and cokes are charged

SEA
DEN
Mediocre 2.3

Not much

Cost of bags, not understanding person in terminal during boarding, plane seats; I keep saying we will NOT Frontier again. I must have been desperate.

SEA
DEN
Mediocre 3.6

Crew was entertaining

Second most uncomfortable plane I've ever been on. Most uncomfortable was the frontier transfer directly after.

Thu, Mar 1
SEA
DEN
2h 43m
Tue, Mar 6
DEN
SEA
2h 58m
Trip: 6 days
Overall 0.0 Poor
Based on 0 reviews
Sun, Feb 18
SEA
DEN
2h 41m
Fri, Feb 23
DEN
SEA
3h 16m
Trip: 6 days
8.5ExcellentShow reviews
Overall 8.5 Excellent
Based on 10 reviews
Overall
8.0
Boarding
8.1
Comfort
7.7
Crew
8.4
Entertainment
7.5
Food
7.3
SEA
DEN
Excellent 8.0

free texting and entertainment!

our flight was delayed half an hour.

SEA
DEN
Good 6.3

I love the new snack choices! Way to go Delta for offering Kind bars now!! This is awesome.

Tiny old plane, props blocked my window view, no entertainment system.

SEA
DEN
Good 6.0

Seats were uncomfortable

BNA
BOS
Mediocre 2.0

Delta staff taking care of rude/beligerant guests first vedore guests patiently/kindly waiting in line ... children watched that behavior and the jerks recieved special treatment. Flight staff ripped up guests boarding pass in face. Staff allowed ys to board plane and put our bags under plane and then crew timed out before take off. Never will use Delta again.

TLH
ATL
Mediocre 2.0

Ice in the morning in Atlanta and Delta cancels my 6pm flight to Atlanta leaving me no flight home that night.

Wed, Apr 25
SEA
DEN
2h 41m
Mon, Apr 30
DEN
SEA
2h 59m
Trip: 6 days
Overall 0.0 Poor
Based on 0 reviews
Wed, May 9
SEA
DEN
2h 51m
Sat, May 12
DEN
SEA
2h 55m
Trip: 4 days
4.9OkayShow reviews
Overall 4.9 Okay
Based on 464 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
SEA
DEN
Good 7.3

They had us pay 45 dollars per carry on bag. CARRY ON BAG..... I was very disappointed. Who does this? I guess frontier. Won't be flying with them again.

SEA
DEN
Mediocre 2.0

Nothing positive

I wasn't allowed to board because they closed the flight. I didn't realize you have to pay an additional fee to get your seat assignement to even get on the flight. I've been delayed a full 24hrs. That on top of $40 fee to have my carry on. At this point, my $175 plane ticket has ballooned to almost $245 which is more expensive than other flights where they treat you like a human being. F this company.

SEA
DEN
Excellent 8.6

boarding/unboarding is painless and enjoyable and attendants are respectfull

snacks and cokes are charged

SEA
DEN
Excellent 8.0

Great flight attendants, amazing landing in Denver.

It was delayed. But I appreciated the meal voucher and voucher for future travel.

SEA
DEN
Mediocre 2.0

I was notified of my flight departing Seattle was delayed resulting in it being impossible for me to make my connecting flight in Denver to Philadelphia hence missing an entire 24 hours I could’ve spent with my family and loosing vacation time. Frontier has not done anything to compensate me for the inconvenience.

Tue, Mar 27
SEA
DEN
2h 44m
Tue, Apr 3
DEN
SEA
2h 58m
Trip: 8 days
Overall 0.0 Poor
Based on 0 reviews
Fri, Jun 1
SEA
DEN
2h 51m
Wed, Jun 6
DEN
SEA
2h 55m
Trip: 6 days
4.9OkayShow reviews
Overall 4.9 Okay
Based on 464 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
SEA
DEN
Mediocre 2.3

Not much

Cost of bags, not understanding person in terminal during boarding, plane seats; I keep saying we will NOT Frontier again. I must have been desperate.

SEA
DEN
Excellent 8.0

Great flight attendants, amazing landing in Denver.

It was delayed. But I appreciated the meal voucher and voucher for future travel.

SEA
DEN
Mediocre 2.6

hmm

layover nothing was in order staff sucked yall kept moving gate yall could at lest give us a soda for the long rides

SEA
DEN
Mediocre 3.0

Didn't crash

All flights were late, seats were extremely uncomfortable.

SEA
DEN
Mediocre 3.3

Good connection, timely departure, pleasant crew

Budget airline ended up being much more expensive than my usual airlines. $40 per bag per leg of the trip, including carry-on?! My wife and I each had one carry on bag (normally free). Since we had a connection each direction that's $40 x 2 (people) x 4 flights = $320. That's ridiculous. Furthermore, these were the worst seating conditions on any airline I've ever seen (and I fly plenty). There is no headrest - the seats barely make it to my shoulders. And the seats themselves have no cushion whatsoever. The tray tables are laughably miniscule - much smaller than my laptop. There is no free snack/beverage or in-flight entertainment. There is no wifi. I will stick to United or Delta in the future.

Thu, Jun 7
SEA
DEN
4h 13m
Tue, Jun 12
DEN
SEA
3h 08m
Trip: 6 days
8.5ExcellentShow reviews
Overall 8.5 Excellent
Based on 10 reviews
Overall
8.0
Boarding
8.1
Comfort
7.7
Crew
8.4
Entertainment
7.5
Food
7.3
ATL
MEX
Excellent 8.3

Tudo conforme esperado em um voo da Delta.

Nada a reclamar.

CUN
ATL
Excellent 9.6

The weather was bad in Atlanta. We were rerouted to Minneapolis and made a connection to Philadelphia. No problems.

SEA
DEN
Okay 5.5

I've only experienced delayed flights with Delta ... and this was no exception. It wasn't weather-related, nor a late flight delivering a plane - just no ground crew to service the plane between flights.

SEA
DEN
Good 6.3

I love the new snack choices! Way to go Delta for offering Kind bars now!! This is awesome.

Tiny old plane, props blocked my window view, no entertainment system.

CMH
ATL
Okay 5.0

As poltronas estavam OK.

No voo MEX-GRU o Sistema de Entretenimento nao funcionou por quase 3hs. A refeicao foi muito fraca, tamto no jantar quanto no café da manhã. Onde ja se viu comer feijão preto com onelete no cafe da manhã??? Deveriam pensar no tipo de passageiro q estao atendendo.

Sat, Mar 3
SEA
DEN
2h 41m
Thu, Mar 8
DEN
SEA
2h 59m
Trip: 6 days
Overall 0.0 Poor
Based on 0 reviews
Wed, Jun 6
SEA
DEN
2h 51m
Mon, Jun 11
DEN
SEA
3h 08m
Trip: 6 days
Overall 0.0 Poor
Based on 0 reviews
Mon, Jul 2
SEA
DEN
2h 43m
Tue, Jul 10
DEN
SEA
2h 56m
Trip: 9 days
4.9OkayShow reviews
Overall 4.9 Okay
Based on 464 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
SEA
DEN
Mediocre 2.0

Nothing positive

I wasn't allowed to board because they closed the flight. I didn't realize you have to pay an additional fee to get your seat assignement to even get on the flight. I've been delayed a full 24hrs. That on top of $40 fee to have my carry on. At this point, my $175 plane ticket has ballooned to almost $245 which is more expensive than other flights where they treat you like a human being. F this company.

SEA
DEN
Excellent 8.0

Great flight attendants, amazing landing in Denver.

It was delayed. But I appreciated the meal voucher and voucher for future travel.

SEA
DEN
Mediocre 2.3

Not much

Cost of bags, not understanding person in terminal during boarding, plane seats; I keep saying we will NOT Frontier again. I must have been desperate.

SEA
DEN
Mediocre 2.6

hmm

layover nothing was in order staff sucked yall kept moving gate yall could at lest give us a soda for the long rides

SEA
DEN
Good 7.3

They had us pay 45 dollars per carry on bag. CARRY ON BAG..... I was very disappointed. Who does this? I guess frontier. Won't be flying with them again.

Thu, Jan 25
SEA
DEN
2h 38m
Sun, Jan 28
DEN
SEA
3h 05m
Trip: 4 days
Overall 0.0 Poor
Based on 0 reviews
Show more results

Seattle/Tacoma Intl to Denver International Flight Information

Avg. Flight Duration 2h 52m
Flights Arrive in Denver International
Flights Depart from Seattle/Tacoma Intl
Flight Price $67
Distance 1022 miles
Airlines Frontier, Delta
*
Prices are per person and are for e–tickets and include all taxes & fees in USD.

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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.