Frontier's UpFront Plus seats guarantee an empty middle seat, offering more space.
Early check-in helps secure your place on overbooked flights, a common practice with Frontier.
$70+ 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 5/9. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — SEA
Jan 28 — Feb 41
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.The best prices from Denver Intl to Seattle/Tacoma Intl are usually found in April or February, booked 23 days in advance, depart on a Friday or Thursday and return on a Friday
Cheap 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 January 23, 2025.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $89 (Cheapflightsfares) |
One-way from | $73 (Cheapflightsfares) |
Popular in | December |
Cheapest in | April |
Average price | $183 |
Good round-trip deal | $227 or less |
Good one-way deal | $155 or less |
Find 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 January 23, 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 January 23, 2025.
This Cheapflightsfares deal was found by Cheapflights users on 1/23. 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.
Wed 3/510:30 amDEN - SEA
Nonstop3h 06mFrontier
Fri 3/72:02 pmSEA - DEN
Nonstop2h 48mFrontier
Deal found 1/23![Frontier logo]()
$89
This Travelocity deal was found by Cheapflights users on 1/21. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/139:57 amDEN - SEA
Nonstop3h 05mMultiple Airlines
Mon 2/178:10 pmSEA - DEN
Nonstop2h 39mMultiple Airlines
Deal found 1/21![Multiple Airlines logo]()
$100
This United Airlines deal was found by Cheapflights users on 1/21. 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.
Sat 2/227:46 amDEN - SEA
Nonstop3h 03mUnited Airlines
Mon 2/243:04 pmSEA - DEN
1 stop6h 24mUnited Airlines
Deal found 1/21![United Airlines logo]()
$123
This Southwest deal was found by Cheapflights users on 1/21. 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.
Fri 2/1410:25 pmDEN - SEA
Nonstop3h 00mSouthwest
Mon 2/175:00 amSEA - DEN
Nonstop2h 35mSouthwest
Deal found 1/21![Southwest logo]()
$157
This Delta deal was found by Cheapflights users on 1/22. 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 2/186:25 amDEN - SEA
Nonstop3h 14mDelta
Sat 2/228:35 pmSEA - DEN
Nonstop2h 42mDelta
Deal found 1/22![Delta logo]()
$167
This Alaska Airlines deal was found by Cheapflights users on 1/23. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/187:00 amDEN - SEA
Nonstop3h 16mAlaska Airlines
Thu 2/208:10 pmSEA - DEN
Nonstop2h 39mAlaska Airlines
Deal found 1/23![Alaska Airlines logo]()
$187
This American Airlines deal was found by Cheapflights users on 1/22. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/1512:11 pmDEN - SEA
1 stop5h 53mAmerican Airlines
Wed 2/196:00 amSEA - DEN
1 stop8h 27mAmerican Airlines
Deal found 1/22![American Airlines logo]()
$208
Find flights from Denver to Seattle within your budget
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 January 23, 2025.
Fly from
Any airport
Fly to
Any airport
Route
Depart
Return
Price
DenverSeattle
DEN - SEA
DENSEA
Denver Intl
Wed 3/5
10:30 am-12:36 pm
Nonstop3h 06m
Seattle/Tacoma Intl
Fri 3/7
2:02 pm-5:50 pm
Nonstop2h 48m
$89
DenverSeattle
DEN - SEA
DENSEA
Denver Intl
Thu 2/13
9:57 am-12:02 pm
Nonstop3h 05m
Seattle/Tacoma Intl
Mon 2/17
8:10 pm-11:49 pm
Nonstop2h 39m
$100
DenverSeattle
DEN - SEA
DENSEA
Denver Intl
Sat 2/22
7:46 am-9:49 am
Nonstop3h 03m
Seattle/Tacoma Intl
Mon 2/24
3:04 pm-10:28 pm
1 stop6h 24m
$123
DenverSeattle
DEN - SEA
DENSEA
Denver Intl
Fri 2/14
10:25 pm-12:25 am
Nonstop3h 00m
Seattle/Tacoma Intl
Mon 2/17
5:00 am-8:35 am
Nonstop2h 35m
$157
DenverSeattle
DEN - SEA
DENSEA
Denver Intl
Tue 2/18
6:25 am-8:39 am
Nonstop3h 14m
Seattle/Tacoma Intl
Sat 2/22
8:35 pm-12:17 am
Nonstop2h 42m
$167
DenverSeattle
DEN - SEA
DENSEA
Denver Intl
Tue 2/18
7:00 am-9:16 am
Nonstop3h 16m
Seattle/Tacoma Intl
Thu 2/20
8:10 pm-11:49 pm
Nonstop2h 39m
$187
DenverSeattle
DEN - SEA
DENSEA
Denver Intl
Sat 2/15
12:11 pm-5:04 pm
1 stop5h 53m
Seattle/Tacoma Intl
Wed 2/19
6:00 am-3:27 pm
1 stop8h 27m
$208
DenverSeattle
DEN - SEA
DENSEA
Denver Intl
Fri 5/9
5:30 am-4:40 pm
1 stop12h 10m
$70
DenverSeattle
DEN - SEA
DENSEA
Denver Intl
Tue 3/18
2:20 pm-8:22 pm
1 stop7h 02m
$80
DenverSeattle
DEN - SEA
DENSEA
Denver Intl
Wed 3/12
6:10 am-8:19 am
Nonstop3h 09m
$89
Showing 1-10 of 15 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 January.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*1 star | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*2 stars | |
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy- | Trust Score*1 star | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy- | 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.
The best insider tips for Denver to Seattle flights
Find out what our experts recommend to make the most of your Denver to Seattle trip
Airlines
![Frontier]()
Frontier
![Alaska Airlines]()
Alaska Airlines
Alaska's Premium Class offers extra legroom and free cocktails, enhancing comfort.
Alaska Airlines' Wi-Fi is a flat fee, ideal for business travelers needing connectivity.
![Delta]()
Delta
Delta offers free Wi-Fi for SkyMiles members on most domestic flights, enhancing in-flight connectivity.
Delta Comfort Plus provides extra legroom and earlier boarding, ideal for a more comfortable journey.
![United Airlines]()
United Airlines
United's Economy Plus offers extra legroom, enhancing comfort on domestic routes.
United's MileagePlus program allows pooling miles, facilitating ticket purchases for family members.
Airports
Our travel experts
Snippets provided in this section are AI-generated based on a summarization of Cheapflights-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
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.
Travel insights for flights from Denver to Seattle
Get recent, data-driven insights about flights from Denver to Seattle including ideal travel times, pricing trends, and more.
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 January 17, 2025.
To ensure you get the cheapest price possible for a flight from Denver to Seattle, you should look to book at least 23 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 $238). Flying from Denver to Seattle in July is currently the most expensive (average of $411). 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 January 23, 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 7% versus a flight at noon.
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 January 21, 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. Tuesday at noon flights should be avoided if possible as fares are typically the most expensive at this time.
Weekly flight availability from Denver to Seattle
Explore weekly flight availability from Denver to Seattle. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated January 23, 2025.
The most flights from DEN to SEA are scheduled on a Thursday (35 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (17 on average).
Rainfall in Seattle by month
Plan your trip to Seattle by taking into account the average rainfall totals by month.
In terms of precipitation, rainfall in Seattle ranges from 0.7 - 6.6 inches per month. November is typically the wettest month, when rainfall can reach 6.6 in. July is typically the driest time to visit Seattle when rainfall is around 0.7 in.
Temperature in Seattle by month
Plan your trip to Seattle by taking into account the average temperature totals by month.
If weather is an important factor for your trip to Seattle, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 66.2 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 41.0 F).
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 January 23, 2025.
Read through reviews of airlines operating flights from Denver to Seattle, such as United Airlines, American Airlines and Frontier. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
4,647 reviews
Crew
8.7
Food
7.2
Overall
8.1
Comfort
8.1
Boarding
8.2
Entertainment
7.7
Reviews
1 / 10
We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.
4,647 reviews
4,647 reviews
Crew
8.7
Food
7.2
Overall
8.1
Comfort
8.1
Boarding
8.2
Entertainment
7.7
Reviews
1 / 10
We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.
9,699 reviews
4,647 reviews
Crew
8.7
Food
7.2
Overall
8.1
Comfort
8.1
Boarding
8.2
Entertainment
7.7
Reviews
1 / 10
We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.
8,508 reviews
4,647 reviews
Crew
8.7
Food
7.2
Overall
8.1
Comfort
8.1
Boarding
8.2
Entertainment
7.7
Reviews
1 / 10
We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.
8,971 reviews
4,647 reviews
Crew
8.7
Food
7.2
Overall
8.1
Comfort
8.1
Boarding
8.2
Entertainment
7.7
Reviews
1 / 10
We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.
10,000 reviews
4,647 reviews
Crew
8.7
Food
7.2
Overall
8.1
Comfort
8.1
Boarding
8.2
Entertainment
7.7
Reviews
1 / 10
We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.
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 Denver?
Book flights to Denver if you plan to visit one of these locationsSeaTac
Tukwila
Renton
Tacoma
Lacey
Federal Way
Ocean Shores
Leavenworth
Olympia
Marysville
Centralia
Cle Elum
Mukilteo
Aberdeen
Lakewood
Issaquah
Shoreline
Lynnwood
Shelton
Silverdale
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 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 2,558,603 searches. Data last updated January 23, 2025.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$56 | Average$129 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$89 | Average$222 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$129 | Average$264 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$129 | Average$202 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$136 | Average$293 | FlexibilityNo cancel fee | On-time69% |