Frontier offers extra comfort seats with 32” separation for a fee, ideal for taller passengers.
Frontier’s Board First option is available with a carry-on purchase or for elite members.
$53+ Cheap flights from Denver to Seattle (DEN - SEA)
This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 2/19. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — SEA
Jan 17 — Jan 241
1 adult, Economy
We work with more than 300 partners to bring you better travel deals
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 68 days in advance, depart on a Friday or Thursday and return on a Friday
Cheap flight deals from Denver to Seattle
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 December 18, 2025.
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 December 18, 2025.
This Frontier deal was found by Cheapflights users on 12/15. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/296:35 amDEN - SEA
1 stop8h 19mFrontier
Mon 1/52:54 pmSEA - DEN
Nonstop2h 49mFrontier
Deal found 12/15![Frontier logo]()
$141
This Kiwi.com deal was found by Cheapflights users on 12/15. 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 12/1710:00 pmDEN - SEA
Nonstop3h 10mFrontier
Sat 1/102:49 pmSEA - DEN
Nonstop2h 49mFrontier
Deal found 12/15![Frontier logo]()
$142
This Frontier deal was found by Cheapflights users on 12/17. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/3110:16 amDEN - SEA
Nonstop3h 14mFrontier
Tue 1/61:00 pmSEA - DEN
Nonstop2h 53mFrontier
Deal found 12/17![Frontier logo]()
$165
This Gotogate deal was found by Cheapflights users on 12/15. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/2910:16 amDEN - SEA
Nonstop3h 14mFrontier
Mon 1/1912:19 pmSEA - DEN
Nonstop2h 51mFrontier
Deal found 12/15![Frontier logo]()
$168
This CheapOair deal was found by Cheapflights users on 12/15. 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.
Thu 12/1810:16 amDEN - SEA
Nonstop3h 14mFrontier
Sun 1/1812:19 pmSEA - DEN
Nonstop2h 51mFrontier
Deal found 12/15![Frontier logo]()
$169
This Expedia deal was found by Cheapflights users on 12/17. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/227:00 amDEN - SEA
1 stop28h 11mFrontier
Thu 1/812:26 pmSEA - DEN
Nonstop2h 51mFrontier
Deal found 12/17![Frontier logo]()
$171
This Orbitz deal was found by Cheapflights users on 12/15. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/2810:29 pmDEN - SEA
1 stop16h 25mFrontier
Tue 1/61:00 pmSEA - DEN
Nonstop2h 53mFrontier
Deal found 12/15![Frontier logo]()
$180
This Kiwi.com deal was found by Cheapflights users on 12/17. 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.
Thu 12/2510:16 amDEN - SEA
Nonstop3h 14mFrontier
Tue 1/61:00 pmSEA - DEN
Nonstop2h 53mFrontier
Deal found 12/17![Frontier logo]()
$182
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 December 18, 2025.
Most accurate provider | CheapOair 3 stars |
|---|---|
Most trusted provider | CheapOair 3 stars |
Round-trip from | $58 (Frontier) |
One-way from | $53 (Kiwi.com) |
Popular in | June |
Cheapest in | January |
Average price | $208 |
Good round-trip deal | $187 or less |
Good one-way deal | $127 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 2,558,603 searches. Data last updated December 18, 2025.
Use the filters below to find and compare flights from Denver to Seattle that are best for you.
Fly from
Denver
Fly to
Seattle
Route
Depart
Return
Price
DenverSeattle
DEN - SEA
DENSEA
Denver Intl
Wed 1/7
12:15 pm-2:28 pm
Nonstop3h 13m
Seattle/Tacoma Intl
Wed 1/14
7:54 pm-11:35 pm
Nonstop2h 41m
$117
DenverSeattle
DEN - SEA
DENSEA
Denver Intl
Sat 1/10
12:30 pm-2:43 pm
Nonstop3h 13m
Seattle/Tacoma Intl
Tue 1/13
1:45 pm-5:34 pm
Nonstop2h 49m
$117
DenverSeattle
DEN - SEA
DENSEA
Denver Intl
Wed 2/18
7:00 am-9:10 am
Nonstop3h 10m
Seattle/Tacoma Intl
Sun 2/22
8:30 am-12:14 pm
Nonstop2h 44m
$117
DenverSeattle
DEN - SEA
DENSEA
Denver Intl
Wed 1/14
6:29 am-8:40 am
Nonstop3h 11m
Seattle/Tacoma Intl
Wed 1/21
1:45 pm-5:34 pm
Nonstop2h 49m
$117
DenverSeattle
DEN - SEA
DENSEA
Denver Intl
Wed 1/7
7:00 am-9:11 am
Nonstop3h 11m
Seattle/Tacoma Intl
Tue 1/13
7:54 pm-11:35 pm
Nonstop2h 41m
$117
DenverSeattle
DEN - SEA
DENSEA
Denver Intl
Tue 1/20
6:50 pm-9:10 pm
Nonstop3h 20m
Seattle/Tacoma Intl
Sun 1/25
5:00 am-11:51 am
1 stop5h 51m
$127
DenverSeattle
DEN - SEA
DENSEA
Denver Intl
Sun 1/11
6:29 am-8:40 am
Nonstop3h 11m
Seattle/Tacoma Intl
Wed 1/14
5:25 am-11:54 am
1 stop5h 29m
$127
DenverSeattle
DEN - SEA
DENSEA
Denver Intl
Tue 1/6
6:29 am-8:40 am
Nonstop3h 11m
Seattle/Tacoma Intl
Mon 1/12
5:25 am-11:54 am
1 stop5h 29m
$127
DenverSeattle
DEN - SEA
DENSEA
Denver Intl
Sat 1/10
6:29 am-8:40 am
Nonstop3h 11m
Seattle/Tacoma Intl
Sun 1/11
5:25 am-11:54 am
1 stop5h 29m
$127
DenverSeattle
DEN - SEA
DENSEA
Denver Intl
Wed 1/7
4:10 pm-11:22 pm
1 stop8h 12m
Seattle/Tacoma Intl
Mon 1/12
7:40 pm-11:25 pm
Nonstop2h 45m
$127
Showing 1-10 of 23 results
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 December.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*1 star | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*2 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy- | Trust Score*1 star | |
| Price Accuracy- | Trust Score*1 star | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on Denver-Seattle flights, users find the pricing of CheapOair to be most consistent on Cheapflights vs. CheapOair Users can find the same prices on Denver-Seattle flight deals on Cheapflights vs. CheapOair >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 CheapOair the most. CheapOair 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.
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
Delays
How far ahead should I book a flight from Denver to Seattle?
Use this chart to determine the optimal time to book a round-trip flight from Denver to Seattle. Price data was last updated on December 12, 2025.
To ensure you get the cheapest price possible for a flight from Denver to Seattle, you should look to book at least 39 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, February is the cheapest month in which you can book a flight from Denver to Seattle (average of $48). Flying from Denver to Seattle in July is currently the most expensive (average of $118). 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 December 18, 2025.
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 evening, which can drop the price by up to 29% versus a flight in the morning.
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 December 13, 2025.
Travelers seeking maximum savings on their Denver to Seattle flight should consider departing on Friday evenings when fares are most often at their lowest. Monday at noon 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 19% of weekly flights between Denver and Seattle have experienced delays in the past year, with the average delay time being 145 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?
Wednesday tends to have the lowest number of delays on this route, whereas Sunday 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, Delta have had the lowest number of delays on this route, with just 13% 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
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 December 18, 2025.
See what other customers who have flown with Alaska Airlines, Delta, and Hawaiian Airlines 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.
Food
7.1
Boarding
8.1
Entertainment
7.0
Crew
8.5
Overall
8.0
Comfort
7.8
Reviews
1 / 20
10.0
ExcellentAnonymous,Dec 2025
SJC - SEA
Food
7.1
Boarding
8.1
Entertainment
7.0
Crew
8.5
Overall
8.0
Comfort
7.8
Reviews
1 / 20
10.0
ExcellentAnonymous,Dec 2025
SJC - SEA
Food
7.1
Boarding
8.1
Entertainment
7.0
Crew
8.5
Overall
8.0
Comfort
7.8
Reviews
1 / 20
10.0
ExcellentAnonymous,Dec 2025
SJC - SEA
Food
7.1
Boarding
8.1
Entertainment
7.0
Crew
8.5
Overall
8.0
Comfort
7.8
Reviews
1 / 20
10.0
ExcellentAnonymous,Dec 2025
SJC - SEA
Food
7.1
Boarding
8.1
Entertainment
7.0
Crew
8.5
Overall
8.0
Comfort
7.8
Reviews
1 / 20
10.0
ExcellentAnonymous,Dec 2025
SJC - SEA
Food
7.1
Boarding
8.1
Entertainment
7.0
Crew
8.5
Overall
8.0
Comfort
7.8
Reviews
1 / 20
10.0
ExcellentAnonymous,Dec 2025
SJC - SEA
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 locationsTacoma
SeaTac
Lakewood
Ocean Shores
Olympia
Edmonds
Lynnwood
Renton
Puyallup
Kirkland
Kent
Tukwila
Cle Elum
Marysville
Leavenworth
Fife
Aberdeen
Shoreline
Centralia
Federal Way
Browse thousands of different options on Cheapflights for your next trip
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Alternative routes for Denver to Seattle
See prices for flight routes from nearby airports that may be better suited for you.
Top 6 airlines flying from Denver to Seattle
Discover the top 6 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 2,558,603 searches. Data last updated December 18, 2025.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$58 | Average$166 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$109 | Average$234 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$111 | Average$255 | FlexibilityNo cancel fee | On-time85% | |
| Cheapest$132 | Average$298 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$138 | Average$239 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$148 | Average$275 | FlexibilityNo cancel fee | On-time75% |