$95+ Cheap flights from Denver to Seattle (DEN - SEA)
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/20. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — SEA
Oct 29 — Nov 51
Round-trip
1 adult, Economy
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Find cheap flights from Denver to Seattle with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheapflights Tip: The best prices from Denver Intl to Seattle/Tacoma Intl are usually found in January or February, booked 47 days in advance, depart on a Friday or Thursday and return on a Friday
Cheap flight deals from Denver to Seattle
Cheapest
Best
Last-minute
One-way
Cheapest flights from Denver to SeattleExplore the most affordable flight options available from Denver to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 29, 2026.
Explore the most affordable flight options available from Denver to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 29, 2026.
This Cheapflightsfares deal was found by Cheapflights users on 9/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/2710:55 pm -
1 stop20h 59m
Tue 11/38:09 pm -
1 stop20h 26m
Deal found 9/28![Frontier logo]()
$163
This Cheapflightsfares deal was found by Cheapflights users on 9/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/2710:55 pm -
1 stop20h 59m
Wed 11/48:09 pm -
1 stop20h 54m
Deal found 9/27![Frontier logo]()
$164
This CheapOair deal was found by Cheapflights users on 9/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/281:10 pm -
1 stop6h 44m
Wed 11/48:09 pm -
1 stop20h 54m
Deal found 9/26![Frontier logo]()
$172
This deal was found by Cheapflights users on 9/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/151:07 pm -
Nonstop3h 05m
Sat 10/174:27 pm -
Nonstop2h 50m
Deal found 9/24![Frontier logo]()
$173
This Cheapflightsfares deal was found by Cheapflights users on 9/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/281:10 pm -
1 stop6h 44m
Tue 11/38:09 pm -
1 stop20h 26m
Deal found 9/27![Frontier logo]()
$174
This Cheapflightsfares deal was found by Cheapflights users on 9/28. Clicking the “Pick Dates ” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/289:10 am -
1 stop10h 44m
Mon 11/98:09 pm -
1 stop12h 36m
Deal found 9/28![Frontier logo]()
$175
This Cheapflightsfares deal was found by Cheapflights users on 9/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/39:12 am -
1 stop12h 35m
Sun 12/62:07 pm -
1 stop24h 07m
Deal found 9/28![Frontier logo]()
$180
This Cheapflightsfares deal was found by Cheapflights users on 9/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/2010:55 pm -
1 stop20h 50m
Wed 10/288:09 pm -
1 stop18h 02m
Deal found 9/24![Frontier logo]()
$181
This Kiwi.com deal was found by Cheapflights users on 9/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/201:07 pm -
Nonstop3h 05m
Wed 11/188:09 pm -
1 stop12h 36m
Deal found 9/24![Frontier logo]()
$182
Best flights from Denver to SeattleDiscover carefully curated flight deals from Denver to Seattle that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 29, 2026.
Discover carefully curated flight deals from Denver to Seattle that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 29, 2026.
This Delta deal was found by Cheapflights users on 9/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/86:00 am -
Nonstop3h 18m
Wed 12/238:30 am -
Nonstop2h 52m
Deal found 9/26![Delta logo]()
$307
This United Airlines deal was found by Cheapflights users on 9/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/33:53 pm -
Nonstop3h 04m
Tue 11/108:30 am -
Nonstop2h 44m
Deal found 9/26![United Airlines logo]()
$307
This Alaska Airlines deal was found by Cheapflights users on 9/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/229:42 pm -
Nonstop3h 07m
Fri 12/257:32 am -
Nonstop2h 45m
Deal found 9/25![Alaska Airlines logo]()
$333
This Southwest deal was found by Cheapflights users on 9/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/158:05 pm -
1 stop6h 35m
Sat 10/1711:40 am -
2 stops10h 00m
Deal found 9/26![Southwest logo]()
$347
This Delta deal was found by Cheapflights users on 9/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/81:17 pm -
Nonstop3h 07m
Thu 12/247:57 pm -
Nonstop2h 49m
Deal found 9/24![Delta logo]()
$313
This Alaska Airlines deal was found by Cheapflights users on 9/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/87:00 am -
Nonstop3h 13m
Thu 12/245:05 pm -
Nonstop2h 39m
Deal found 9/25![Alaska Airlines logo]()
$333
This Delta deal was found by Cheapflights users on 9/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/96:00 am -
Nonstop3h 12m
Tue 11/108:30 am -
Nonstop2h 47m
Deal found 9/23![Delta logo]()
$313
This Southwest deal was found by Cheapflights users on 9/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/248:45 am -
2 stops9h 55m
Mon 10/265:10 pm -
1 stop6h 35m
Deal found 9/28![Southwest logo]()
$347
This Alaska Airlines deal was found by Cheapflights users on 9/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/57:47 am -
1 stop6h 10m
Tue 2/93:16 pm -
Nonstop2h 40m
Deal found 9/24![Alaska Airlines logo]()
$334
This Delta deal was found by Cheapflights users on 9/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/241:55 pm -
Nonstop3h 13m
Mon 10/269:45 am -
1 stop7h 24m
Deal found 9/26![Delta logo]()
$332
This Delta deal was found by Cheapflights users on 9/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/226:33 pm -
Nonstop3h 07m
Fri 11/278:30 am -
Nonstop2h 47m
Deal found 9/23![Delta logo]()
$350
Last-minute flights from Denver to SeattleDiscover last-minute flight deals from Denver to Seattle. Data last updated September 29, 2026 and is based on user searches.
Discover last-minute flight deals from Denver to Seattle. Data last updated September 29, 2026 and is based on user searches.
This deal was found by Cheapflights users on 9/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/151:07 pm -
Nonstop3h 05m
Sat 10/174:27 pm -
Nonstop2h 50m
Deal found 9/24![Frontier logo]()
$173
This Cheapflightsfares deal was found by Cheapflights users on 9/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/2010:55 pm -
1 stop20h 50m
Wed 10/288:09 pm -
1 stop18h 02m
Deal found 9/24![Frontier logo]()
$181
This Kiwi.com deal was found by Cheapflights users on 9/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/201:07 pm -
Nonstop3h 05m
Wed 11/188:09 pm -
1 stop12h 36m
Deal found 9/24![Frontier logo]()
$182
This Kiwi.com deal was found by Cheapflights users on 9/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/211:10 pm -
1 stop6h 35m
Wed 11/188:09 pm -
1 stop12h 36m
Deal found 9/24![Frontier logo]()
$180
This Cheapflightsfares deal was found by Cheapflights users on 9/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/2710:55 pm -
1 stop20h 59m
Tue 11/38:09 pm -
1 stop20h 26m
Deal found 9/28![Frontier logo]()
$163
This Cheapflightsfares deal was found by Cheapflights users on 9/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/2710:55 pm -
1 stop20h 59m
Wed 11/48:09 pm -
1 stop20h 54m
Deal found 9/27![Frontier logo]()
$164
This CheapOair deal was found by Cheapflights users on 9/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/281:10 pm -
1 stop6h 44m
Wed 11/48:09 pm -
1 stop20h 54m
Deal found 9/26![Frontier logo]()
$172
This Cheapflightsfares deal was found by Cheapflights users on 9/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/281:10 pm -
1 stop6h 44m
Tue 11/38:09 pm -
1 stop20h 26m
Deal found 9/27![Frontier logo]()
$174
This Cheapflightsfares deal was found by Cheapflights users on 9/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/289:10 am -
1 stop10h 44m
Mon 11/98:09 pm -
1 stop12h 36m
Deal found 9/28![Frontier logo]()
$175
One-way flights from Denver to SeattleSearch for one-way flight options from Denver to Seattle. Find affordable one-way fares based on user searches. Data last updated September 29, 2026.
Search for one-way flight options from Denver to Seattle. Find affordable one-way fares based on user searches. Data last updated September 29, 2026.
This Super.com deal was found by Cheapflights users on 9/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/201:10 pm -
1 stop6h 35m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/26![Frontier logo]()
$95
This Cheapflightsfares deal was found by Cheapflights users on 9/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/211:10 pm -
1 stop6h 35m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/25![Frontier logo]()
$97
This Cheapflightsfares deal was found by Cheapflights users on 9/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/241:14 pm -
Nonstop3h 08m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/24![Frontier logo]()
$99
This Super.com deal was found by Cheapflights users on 9/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/261:10 pm -
1 stop6h 35m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/26![Frontier logo]()
$100
This Cheapflightsfares deal was found by Cheapflights users on 9/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/221:10 pm -
1 stop6h 35m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/23![Frontier logo]()
$101
This Super.com deal was found by Cheapflights users on 9/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/231:14 pm -
Nonstop3h 08m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/23![Frontier logo]()
$103
This Super.com deal was found by Cheapflights users on 9/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/141:32 pm -
Nonstop3h 11m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/25![Frontier logo]()
$104
This Cheapflightsfares deal was found by Cheapflights users on 9/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/241:07 pm -
Nonstop3h 05m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/27![Frontier logo]()
$107
This FlightHub deal was found by Cheapflights users on 9/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/221:03 pm -
Nonstop3h 11m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/24![Frontier logo]()
$108
Find flight deals from Denver to Seattle
Discover tips and strategies to find the most affordable flight options for your journey from Denver (DEN) to Seattle (SEA). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated September 29, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $163 (Cheapflightsfares) |
One-way from | $95 (Super.com) |
Popular in | July |
Cheapest in | January |
Average price | $297 |
Good round-trip deal | $286 or less |
Good one-way deal | $152 or less |
Cheapflights 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, Cheapflights users made 7,457,451 searches. Data last updated September 29, 2026.
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
Cheapest round-trip
DenverSeattle
DEN Denver Intl - SEA Seattle/Tacoma Intl
DENSEA
Denver Intl
Thu 10/22
1:10 pm-6:45 pm
1 stop6h 35m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$101
DenverSeattle
DEN Denver Intl - SEA Seattle/Tacoma Intl
DENSEA
Denver Intl
Sun 11/22
1:14 pm-3:22 pm
Nonstop3h 08m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$123
DenverSeattle
DEN Denver Intl - SEA Seattle/Tacoma Intl
DENSEA
Denver Intl
Fri 10/23
1:10 pm-6:45 pm
1 stop6h 35m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$129
Quickest round-trip
DenverSeattle
DEN Denver Intl - SEA Seattle/Tacoma Intl
DENSEA
Denver Intl
Tue 10/20
12:20 pm-2:20 pm
Nonstop3h 00m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$154
DenverSeattle
DEN Denver Intl - SEA Seattle/Tacoma Intl
DENSEA
Denver Intl
Thu 11/12
3:25 pm-5:27 pm
Nonstop3h 02m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$160
DenverSeattle
DEN Denver Intl - SEA Seattle/Tacoma Intl
DENSEA
Denver Intl
Wed 3/24
7:02 pm-11:00 pm
1 stop4h 58m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$164
DenverSeattle
DEN Denver Intl - SEA Seattle/Tacoma Intl
DENSEA
Denver Intl
Tue 10/20
9:45 am-7:56 pm
2 stops11h 11m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$173
DenverSeattle
DEN Denver Intl - SEA Seattle/Tacoma Intl
DENSEA
Denver Intl
Mon 11/23
7:15 pm-1:20 am
2 stops7h 05m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$175
DenverSeattle
DEN Denver Intl - SEA Seattle/Tacoma Intl
DENSEA
Denver Intl
Thu 1/7
1:45 pm-9:26 pm
2 stops8h 41m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$177
DenverSeattle
DEN Denver Intl - SEA Seattle/Tacoma Intl
DENSEA
Denver Intl
Tue 12/8
6:00 am-8:18 am
Nonstop3h 18m
Seattle/Tacoma Intl
Wed 12/23
8:30 am-12:22 pm
Nonstop2h 52m
$307
Showing 1-10 of 20 resultsSorted by cheapest first
Compare providers for flights from Denver to Seattle
Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Denver to Seattle in September.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*1 star | |
| Price Accuracy- | Trust Score*3 stars | |
| Price Accuracy- | Trust Score*1 star | |
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy- | Trust Score*1 star | |
| Price Accuracy2 stars | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on Denver-Seattle flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Denver-Seattle flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Denver-Seattle flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Denver-Seattle flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Denver-Seattle flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.
Best time to book a flight from Denver to Seattle
Have a flexible travel schedule? Discover the best time to fly to Seattle from Denver with our price prediction graph.
DEN-SEA
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Cheapflights Insights
Everything you need to know about your flight from Denver to Seattle
Prices
Airlines
Delays
How far ahead should I book a flight from Denver to Seattle?
To ensure you get the cheapest price possible for a flight from Denver to Seattle, you should look to book at least 46 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.
What is the cheapest month to book a flight from Denver to Seattle?
Currently, January is the cheapest month in which you can book a flight from Denver to Seattle (average of $139). Flying from Denver to Seattle in July is currently the most expensive (average of $325). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
What is the cheapest time of day to fly from DEN to SEA?
Find hourly flight availability from Denver to Seattle. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 29, 2026.
When flying from Denver to Seattle, the time of day you fly usually plays a role in the price. Save by searching for a flight in the morning, which can drop the price by up to 20% versus a flight in the afternoon.
What is the cheapest day to fly from Denver to Seattle?
Use this chart to determine the cheapest time to fly round-trip from Denver to Seattle. Price data was last updated on September 26, 2026.
Travelers seeking maximum savings on their Denver to Seattle flight should consider departing on Friday mornings when fares are most often at their lowest. Tuesday evenings flights should be avoided if possible as fares are typically the most expensive at this time.
How often are flights from Denver to Seattle delayed?
About 17% of weekly flights between Denver and Seattle have experienced delays in the past year, with the average delay time being 140 minutes.
What is the most punctual flight time for Denver to Seattle flights?
Historically, flights departing in the morning are less likely to be delayed, whereas flights leaving at night tend to experience delays more often.
What day of the week experiences the fewest flight delays on this route?
Tuesday tends to have the lowest number of delays on this route, whereas Thursday has historically faced a higher average of delays compared to other days of the week.
Which airline has the best punctuality record on Denver to Seattle flights?
Over the last year, Frontier have had the lowest number of delays on this route, with just 10% of flights being delayed.
The best insider tips for Denver to Seattle flights
AI-powered summary based on content written by travel experts. AI can make mistakes.
Cheapflights partnered with top experts to bring you the best recommendations for your Denver to Seattle trip
Our travel experts
Reviews of airlines servicing Seattle
Get insights into the airlines that provide service to Seattle. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Seattle. Reviews last updated September 29, 2026.
See what other customers who have flown with Southwest,Alaska Airlines, andDelta from Denver to Seattle have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Crew
8.6
Comfort
8.0
Entertainment
7.5
Food
7.0
Boarding
8.1
Overall
8.0
Reviews
1 / 20
10.0
ExcellentCourtney,Sep 2026
DEN - STL
Crew
8.6
Comfort
8.0
Entertainment
7.5
Food
7.0
Boarding
8.1
Overall
8.0
Reviews
1 / 20
10.0
ExcellentCourtney,Sep 2026
DEN - STL
Crew
8.6
Comfort
8.0
Entertainment
7.5
Food
7.0
Boarding
8.1
Overall
8.0
Reviews
1 / 20
10.0
ExcellentCourtney,Sep 2026
DEN - STL
Crew
8.6
Comfort
8.0
Entertainment
7.5
Food
7.0
Boarding
8.1
Overall
8.0
Reviews
1 / 20
10.0
ExcellentCourtney,Sep 2026
DEN - STL
Crew
8.6
Comfort
8.0
Entertainment
7.5
Food
7.0
Boarding
8.1
Overall
8.0
Reviews
1 / 20
10.0
ExcellentCourtney,Sep 2026
DEN - STL
Crew
8.6
Comfort
8.0
Entertainment
7.5
Food
7.0
Boarding
8.1
Overall
8.0
Reviews
1 / 20
10.0
ExcellentCourtney,Sep 2026
DEN - STL
Related info for your journey
Find useful and relevant information for your journey from Denver to Seattle. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Traveling to a place near Seattle?
Book flights to Seattle if you plan to visit one of these locationsSeaTac
Renton
Tacoma
Lacey
Leavenworth
Olympia
Tukwila
Snoqualmie
Puyallup
Lynnwood
Centralia
Kent
Tumwater
Ocean Shores
Ellensburg
Issaquah
Marysville
Lakewood
Fife
Poulsbo
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Denver and Seattle flights
Browse other Denver and Seattle flight options. Last updated on September 29, 2026.
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Top 5 airlines flying from Denver to Seattle
Discover the top 5 airlines that operate flights from Denver to Seattle. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 7,457,451 searches. Data last updated September 29, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$54 | Average$208 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$80 | Average$240 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$117 | Average$347 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$117 | Average$336 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$131 | Average$307 | FlexibilityNo cancel fee | On-time75% |