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.
$89+ 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 7/16. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — SEA
Jun 17 — Jun 241
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 October or September, booked 28 days in advance, depart on a Friday or Thursday and return on a Saturday
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 June 12, 2025.
Round-trip from | $133 (Frontier) |
|---|---|
One-way from | $89 (Hawaiian Airlines) |
Popular in | May |
Cheapest in | October |
Average price | $226 |
Good round-trip deal | $217 or less |
Good one-way deal | $131 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 June 12, 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 June 12, 2025.
This Frontier deal was found by Cheapflights users on 6/9. 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.
Thu 8/1410:29 pmDEN - SEA
Nonstop3h 05mFrontier
Mon 8/254:40 pmSEA - DEN
Nonstop2h 45mFrontier
Deal found 6/9![Frontier logo]()
$133
This Delta deal was found by Cheapflights users on 6/10. 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.
Wed 8/136:35 amDEN - SEA
Nonstop2h 54mDelta
Tue 8/197:10 amSEA - DEN
Nonstop2h 45mDelta
Deal found 6/10![Delta logo]()
$157
This Alaska Airlines deal was found by Cheapflights users on 6/9. 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 8/1511:33 amDEN - SEA
1 stop4h 51mAlaska Airlines
Tue 8/266:00 pmSEA - DEN
Nonstop2h 47mAlaska Airlines
Deal found 6/9![Alaska Airlines logo]()
$187
This United Airlines deal was found by Cheapflights users on 6/10. 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.
Thu 10/96:00 amDEN - SEA
1 stop6h 56mUnited Airlines
Fri 10/175:00 amSEA - DEN
Nonstop2h 42mUnited Airlines
Deal found 6/10![United Airlines logo]()
$213
This Hawaiian Airlines deal was found by Cheapflights users on 6/12. 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 Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/2811:40 amDEN - SEA
1 stop4h 53mHawaiian Airlines
Tue 9/25:20 amSEA - DEN
1 stop4h 20mHawaiian Airlines
Deal found 6/12![Hawaiian Airlines logo]()
$251
This Southwest deal was found by Cheapflights users on 6/10. 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 7/1710:35 pmDEN - SEA
Nonstop2h 50mSouthwest
Wed 7/237:30 amSEA - DEN
2 stops8h 00mSouthwest
Deal found 6/10![Southwest logo]()
$262
This Expedia deal was found by Cheapflights users on 6/11. 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.
Wed 6/189:36 pmDEN - SEA
Nonstop3h 08mMultiple Airlines
Mon 6/308:17 pmSEA - DEN
Nonstop2h 42mMultiple Airlines
Deal found 6/11![Multiple Airlines logo]()
$288
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 June 12, 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
Thu 8/14
10:29 pm-12:34 am
Nonstop3h 05m
Seattle/Tacoma Intl
Tue 8/19
6:41 am-10:30 am
Nonstop2h 49m
$133
DenverSeattle
DEN - SEA
DENSEA
Denver Intl
Wed 8/13
6:35 am-8:29 am
Nonstop2h 54m
Seattle/Tacoma Intl
Tue 8/19
7:10 am-10:55 am
Nonstop2h 45m
$157
DenverSeattle
DEN - SEA
DENSEA
Denver Intl
Fri 8/15
11:33 am-3:24 pm
1 stop4h 51m
Seattle/Tacoma Intl
Wed 8/20
10:15 am-2:06 pm
Nonstop2h 51m
$187
DenverSeattle
DEN - SEA
DENSEA
Denver Intl
Wed 7/9
5:50 pm-7:50 pm
Nonstop3h 00m
Seattle/Tacoma Intl
Mon 7/14
7:48 pm-11:40 pm
Nonstop2h 52m
$248
DenverSeattle
DEN - SEA
DENSEA
Denver Intl
Thu 7/17
10:35 pm-12:25 am
Nonstop2h 50m
Seattle/Tacoma Intl
Wed 7/23
7:30 am-4:30 pm
2 stops8h 00m
$262
DenverSeattle
DEN - SEA
DENSEA
Denver Intl
Thu 7/31
7:06 pm-10:59 pm
1 stop4h 53m
Seattle/Tacoma Intl
Tue 8/5
5:25 am-10:37 am
1 stop4h 12m
$276
DenverSeattle
DEN - SEA
DENSEA
Denver Intl
Wed 7/16
9:00 pm-10:59 pm
Nonstop2h 59m
$89
DenverSeattle
DEN - SEA
DENSEA
Denver Intl
Sat 9/6
3:07 pm-9:08 pm
1 stop7h 01m
$94
DenverSeattle
DEN - SEA
DENSEA
Denver Intl
Sun 8/31
7:30 am-9:34 am
Nonstop3h 04m
$98
DenverSeattle
DEN - SEA
DENSEA
Denver Intl
Thu 8/21
9:23 pm-11:21 pm
Nonstop2h 58m
$99
Showing 1-10 of 15 results
The best insider tips for Denver to Seattle flights
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.
Cheapflights partnered with top experts to bring you the best recommendations for your Denver to Seattle trip
Airlines
![Frontier]()
Frontier
![Alaska Airlines]()
Alaska Airlines
Alaska Airlines offers Wi-Fi for a flat fee, ideal for business travelers needing connectivity.
Alaska’s MileagePlan awards miles based on distance, not ticket price, offering great value.
Airports
Our travel experts
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
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 June 9, 2025.
To ensure you get the cheapest price possible for a flight from Denver to Seattle, you should look to book at least 28 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 $391). 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 June 12, 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 afternoon, which can drop the price by up to 30% 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 June 8, 2025.
Travelers seeking maximum savings on their Denver to Seattle flight should consider departing on Thursday afternoons when fares are most often at their lowest. Sunday 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 June 12, 2025.
The most flights from DEN to SEA are scheduled on a Wednesday (54 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (7 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 June 12, 2025.
Read through reviews of airlines operating flights from Denver to Seattle, such as Alaska Airlines, Southwest and Delta. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Overall
8.0
Entertainment
7.1
Comfort
7.8
Food
7.1
Boarding
8.1
Crew
8.5
Reviews
1 / 20
10.0
ExcellentCheri,Jan 2025
FAT - SEA
Overall
8.0
Entertainment
7.1
Comfort
7.8
Food
7.1
Boarding
8.1
Crew
8.5
Reviews
1 / 20
10.0
ExcellentCheri,Jan 2025
FAT - SEA
Overall
8.0
Entertainment
7.1
Comfort
7.8
Food
7.1
Boarding
8.1
Crew
8.5
Reviews
1 / 20
10.0
ExcellentCheri,Jan 2025
FAT - SEA
Overall
8.0
Entertainment
7.1
Comfort
7.8
Food
7.1
Boarding
8.1
Crew
8.5
Reviews
1 / 20
10.0
ExcellentCheri,Jan 2025
FAT - SEA
Overall
8.0
Entertainment
7.1
Comfort
7.8
Food
7.1
Boarding
8.1
Crew
8.5
Reviews
1 / 20
10.0
ExcellentCheri,Jan 2025
FAT - SEA
Overall
8.0
Entertainment
7.1
Comfort
7.8
Food
7.1
Boarding
8.1
Crew
8.5
Reviews
1 / 20
10.0
ExcellentCheri,Jan 2025
FAT - 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 Denver?
Book flights to Denver if you plan to visit one of these locationsSeaTac
Tukwila
Tacoma
Lakewood
Ocean Shores
Lacey
Leavenworth
Federal Way
Lynnwood
Olympia
Shoreline
Kent
Cle Elum
Centralia
Kirkland
Aberdeen
Renton
Shelton
Silverdale
Issaquah
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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 June 12, 2025.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$58 | Average$150 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$109 | Average$234 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$118 | Average$257 | FlexibilityNo cancel fee | On-time85% | |
| Cheapest$133 | Average$229 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$148 | Average$298 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$156 | Average$274 | FlexibilityNo cancel fee | On-time75% |