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$80+ Cheap flights from Seattle to Denver (SEA - DEN)

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 8/12. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — DEN
Jul 8 — Jul 151
Tue 7/8
Tue 7/15
1 adult, Economy
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Cheapflights Tip: The best prices from Seattle/Tacoma Intl to Denver Intl are usually found in October or September, booked 86 days in advance, depart on a Saturday or Thursday and return on a Friday

Cheap flight deals from Seattle to Denver

Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to Denver (DEN). 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 July 3, 2025.

Round-trip from

$135
(FlightHub)

One-way from

$80
(Priceline)

Popular in

December

Cheapest in

October

Average price

$208

Good round-trip deal

$212 or less

Good one-way deal

$141 or less
From Seattle/Tacoma Intl to Denver Intl
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One-way flight from Seattle/Tacoma Intl to Denver Intl
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Highest demand for flights based on searches. 0% potential increase in price ($2 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($5 potential savings vs. average RT price).
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Average for round-trip flights in July 2025
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Price to beat on a round-trip flight from Seattle/Tacoma Intl to Denver Intl.
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Price to beat on a one-way flight from Seattle/Tacoma Intl to Denver Intl.
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Find flight deals from Seattle to Denver

Cheapest flights from Seattle to Denver
Explore the most affordable flight options available from Seattle to Denver. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 3, 2025.

This FlightHub deal was found by Cheapflights users on 7/3. 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.
Thu 7/246:25 amSEA - DEN
Nonstop2h 49mFrontier
Wed 7/309:36 pmDEN - SEA
Nonstop3h 06mFrontier
Deal found 7/3$135
This Alaska Airlines deal was found by Cheapflights users on 7/2. 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 8/58:17 pmSEA - DEN
Nonstop2h 42mAlaska Airlines
Wed 8/66:00 amDEN - SEA
Nonstop3h 01mAlaska Airlines
Deal found 7/2$177
This Southwest deal was found by Cheapflights users on 7/2. 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 10/2512:35 pmSEA - DEN
Nonstop2h 35mSouthwest
Mon 10/277:50 amDEN - SEA
2 stops8h 10mSouthwest
Deal found 7/2$180

Cheapflights Fare Finder

Customize your flight search to find flights from Seattle to Denver 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 July 3, 2025.
Use the filters below to find and compare flights from Seattle to Denver that are best for you.

Fly from

Seattle

Fly to

Denver

Route

Depart

Return

Price

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Thu 7/24

6:25 am-10:14 am

Nonstop2h 49m

Denver Intl

Wed 7/30

9:36 pm-11:42 pm

Nonstop3h 06m

$135

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Tue 8/5

8:17 pm-11:59 pm

Nonstop2h 42m

Denver Intl

Wed 8/6

6:00 am-8:01 am

Nonstop3h 01m

$177

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Tue 8/5

1:42 pm-8:44 pm

1 stop6h 02m

$84

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Thu 9/18

6:00 pm-9:42 pm

Nonstop2h 42m

$87

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Wed 8/13

5:25 am-10:37 am

1 stop4h 12m

$88

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Fri 9/12

11:20 am-6:37 pm

1 stop6h 17m

$96

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Tue 8/19

6:15 am-2:05 pm

2 stops6h 50m

$102

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Sun 7/27

7:00 pm-10:51 pm

Nonstop2h 51m

$119

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/3

The best insider tips for Seattle to Denver 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 Seattle to Denver trip
Airlines
Frontier

Frontier's UpFront Plus guarantees an empty middle seat for added comfort.


Early check-in with Frontier helps secure your place on overbooked flights.

Read more about Frontierby Marisa Garcia
Alaska Airlines

Saver Fare allows a carry-on but restricts seat selection and changes.


Alaska's Wi-Fi is a flat fee, ideal for business travelers needing connectivity.

Read more about Alaska Airlinesby Robert Schrader
United Airlines

United's Economy Plus offers extra legroom and priority boarding for MileagePlus members.


Prepay for checked bags on United to save money on fees.

Read more about United Airlinesby Harriet Baskas
Airports
SEA

Use SEA Spot Saver for free security screening appointments. Sign up online a few days before your flight to reduce wait times.

Read more about SEAby Brandon Schultz
DEN

Take the A Line train from DEN to Union Station for a quick, cost-effective ride into downtown Denver.

Read more about DENby Emily Zemler
Our travel experts
Marisa Garcia

Marisa Garcia

Expert on Frontier

Marisa Garcia

Marisa Garcia

Marisa knows planes inside and out, spending 16 years working on aircraft in hangars at airports around the world. She is an aviation industry expert, specialized in airline interiors and regulations. Ten years ago, she pivoted to journalism. She shares her insights in leading aviation, travel, and business publications and on her site FlightChic.

Read more
Robert Schrader

Robert Schrader

Expert on Alaska Airlines

Robert Schrader

Robert Schrader

One of the web's original travel bloggers, Robert launched his first site Leave Your Daily Hell in 2009. Since then, he's expanded into destination niche sites (one each for Japan, Thailand and Taiwan), in addition to having written for the inflight magazines of Singapore Airlines and Korean Air. Overall, he's visited nearly 100 countries, and flies business as often as possible.

Read more
Harriet Baskas

Harriet Baskas

Expert on United Airlines

Harriet Baskas

Harriet Baskas

Harriet is an award-winning journalist who is happiest in an airport or an unusual museum. Her stories about airports, air travel, and the business of travel have appeared on NBC News, CNBC, USA TODAY, The Points Guy and other outlets. She is the creator of the StuckatTheAirport.com blog and the author of nine books. When not out on the road or exploring the latest airport amenities, she’s home in Seattle getting ready for the next adventure.

Read more
Emily Zemler

Emily Zemler

Expert on DEN

Emily Zemler

Emily Zemler

Emily is a freelance writer and book author based in London covering entertainment and travel. Her work has appeared in Los Angeles Times, Observer, and Conde Nast Traveler She has ventured to more than 40 countries and all seven continents, always in search of a great art museum. She has written extensively about hotels, luxury travel, and aviation.

Read more
Brandon Schultz

Brandon Schultz

Expert on SEA

Brandon Schultz

Brandon Schultz

Brandon Schultz is an award-winning food and travel writer based in New York City. His work has appeared in Forbes, AAA, Thrillist, Travel + Leisure, and The Daily Meal, among many others, and he is the author of 6 books, including 3 cookbooks.

Read more

Best time to book a flight from Seattle to Denver

Have a flexible travel schedule? Discover the best time to fly to Denver from Seattle 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 Seattle to Denver

How far ahead should I book a flight from Seattle to Denver?

Use this chart to determine the optimal time to book a round-trip flight from Seattle to Denver. Price data was last updated on June 27, 2025.

To ensure you get the cheapest price possible for a flight from Seattle to Denver, you should look to book at least 86 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 Seattle to Denver?

Currently, October is the cheapest month in which you can book a flight from Seattle to Denver (average of $197). Flying from Seattle to Denver in March is currently the most expensive (average of $278). 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 SEA to DEN?

Find hourly flight availability from Seattle to Denver. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 3, 2025.

A simple way to save on the total cost of your ticket is to fly from Seattle to Denver in the evening. If you’re flexible enough to do this you can expect to save up to 37% on your trip compared to booking a flight in the morning.

What is the cheapest day to fly from Seattle to Denver?

Use this chart to determine the cheapest time to fly round-trip from Seattle to Denver. Price data was last updated on June 29, 2025.

Travelers seeking maximum savings on their Seattle to Denver flight should consider departing on Wednesday evenings when fares are most often at their lowest. Monday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

Weekly flight availability from Seattle to Denver

Explore weekly flight availability from Seattle to Denver. 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 July 3, 2025.

The most flights from SEA to DEN are scheduled on a Thursday (57 on average). You will have fewer flight options on Friday, which is when the least amount of flights are scheduled (26 on average).

Reviews of airlines servicing Denver

Get insights into the airlines that provide service to Denver. 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 Denver. Reviews last updated July 3, 2025.
Read reviews from past customers who have flown Alaska Airlines, Southwest, and Delta from Seattle to Denver. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Food

7.1

Crew

8.5

Comfort

7.8

Entertainment

7.1

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Food

7.1

Crew

8.5

Comfort

7.8

Entertainment

7.1

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥
Southwest
8.0
Very good
4,266 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Food

7.1

Crew

8.5

Comfort

7.8

Entertainment

7.1

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥
Delta
8.0
Very good
7,982 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Food

7.1

Crew

8.5

Comfort

7.8

Entertainment

7.1

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥
Hawaiian Airlines
7.8
Good
2,545 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Food

7.1

Crew

8.5

Comfort

7.8

Entertainment

7.1

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Food

7.1

Crew

8.5

Comfort

7.8

Entertainment

7.1

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥

Related info for your journey

Find useful and relevant information for your journey from Seattle to Denver. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airports do I use to fly from Seattle to Denver?

    If you wish to fly to Denver from Seattle, then you need to book flights from Seattle/Tacoma Intl to Denver Intl. There are 38 flights from Seattle/Tacoma Intl (SEA) to Denver Intl (DEN) per day to choose from. Flights to Denver from Seattle/Tacoma Intl are available from 6 different airlines, which means you should have some options if you want to compare airfare deals. 2h 42m is how long a nonstop flight from Seattle to Denver Intl typically takes.

  • How popular is this Seattle to Denver flight route?

    Within the past month, 292 users have taken a look at flights from Seattle/Tacoma Intl to Denver Intl.

  • What are the cheapest airlines flying from Seattle to Denver round-trip?

    Currently priced at $135, Frontier will fly you from Seattle to Denver and back. In addition to Frontier, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Alaska Airlines and Southwest - these airlines can fly you to your destination from $175 and $180, respectively. These flights start at 34% lower than the current average price 3 months from now.

  • What are the cheapest airlines to fly from Seattle to Denver one-way?

    For one-way options, check prices for Frontier. According to our data, you can fly for as low as $80. Users have also found prices from $87 and $88 on Delta and Alaska Airlines, respectively.

  • What are the most reliable airlines from Seattle to Denver?

    No one likes to see their flight delayed. When booking a flight from Seattle to Denver consider choosing United Airlines (80%), ANA (76%) or Copa Airlines (68%) as they are the most reliable in getting you off to your destination on time.

  • What are the cheapest flights from Seattle to Denver?

    Looking at all options, your cheapest flight can be booked for $99. While the most popular route (Seattle/Tacoma Intl - Denver Intl) can be booked for $108 on average our data indicates $784 when flying from Seattle to Denver.

  • Can I find deals for flights from Seattle to Denver that include hotel bookings?

    Yes. In addition to deals on Seattle to Denver flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Seattle to Denver?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Seattle to Denver.

  • Can I find deals for business class flights from Seattle to Denver?

    Yes. Cheapflights offers flight deals from Seattle to Denver by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Seattle to Denver?

    Currently, October is the cheapest month in which you can book a flight from Seattle to Denver (average of $197). Flying from Seattle to Denver in March is currently the most expensive (average of $278). 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.

See more FAQs

Traveling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
Westminster
Black Hawk
Winter Park
Lakewood
Cripple Creek
Golden
Brighton
Silverthorne
Thornton
Frisco
Broomfield
Grand Lake
Manitou Springs
Central City
Fort Morgan
Glendale
Copper Mountain
Wheat Ridge
Longmont
Idaho Springs

Browse thousands of different options on Cheapflights for your next trip

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Top 6 airlines flying from Seattle to Denver

Discover the top 6 airlines that operate flights from Seattle to Denver. 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 July 3, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$57Average$152FlexibilityNo cancel feeOn-time62%
Hawaiian AirlinesCheapest$98Average$241FlexibilityNo cancel feeOn-time85%
DeltaCheapest$112Average$247FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$125Average$248FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$149Average$309FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$166Average$295FlexibilityNo cancel feeOn-time75%

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