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$43+ 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 5/14. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — DEN
Apr 2 — Apr 91
Thu 4/2
Thu 4/9
1 adult, Economy
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Find cheap flights from Seattle to Denver 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 Seattle/Tacoma Intl to Denver Intl are usually found in January or September, booked 69 days in advance, depart on a Friday or Saturday and return on a Thursday

Cheap 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 March 3, 2026.

This Expedia deal was found by Cheapflights users on 2/26. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/27:12 pm
SEA
-
DEN
Nonstop2h 47m
Multiple Airlines
Wed 5/66:00 am
DEN
-
SEA
Nonstop3h 03m
Multiple Airlines
Deal found 2/26$79
This Super.com deal was found by Cheapflights users on 3/1. 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 4/147:12 pm
SEA
-
DEN
Nonstop2h 47m
Frontier
Fri 4/177:40 am
DEN
-
SEA
Nonstop3h 12m
Frontier
Deal found 3/1$81
This Expedia deal was found by Cheapflights users on 3/1. 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 4/158:07 pm
SEA
-
DEN
Nonstop2h 52m
Frontier
Sat 4/187:15 am
DEN
-
SEA
Nonstop3h 12m
Frontier
Deal found 3/1$82
This Super.com deal was found by Cheapflights users on 2/27. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/612:42 pm
SEA
-
DEN
Nonstop2h 55m
Frontier
Thu 4/99:25 am
DEN
-
SEA
Nonstop3h 12m
Frontier
Deal found 2/27$84
This Kiwi.com deal was found by Cheapflights users on 3/3. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/174:20 pm
SEA
-
DEN
Nonstop2h 51m
Multiple Airlines
Fri 4/246:00 am
DEN
-
SEA
Nonstop3h 03m
Multiple Airlines
Deal found 3/3$85
This Kiwi.com deal was found by Cheapflights users on 3/2. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/47:12 pm
SEA
-
DEN
Nonstop2h 47m
Multiple Airlines
Sat 5/96:00 am
DEN
-
SEA
Nonstop3h 03m
Multiple Airlines
Deal found 3/2$87
This Kiwi.com deal was found by Cheapflights users on 3/2. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/1112:42 pm
SEA
-
DEN
Nonstop2h 55m
Multiple Airlines
Tue 4/147:00 am
DEN
-
SEA
Nonstop3h 10m
Multiple Airlines
Deal found 3/2$88
This Trip.com deal was found by Cheapflights users on 3/1. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/238:05 pm
SEA
-
DEN
Nonstop2h 54m
Alaska Airlines
Sun 4/266:00 am
DEN
-
SEA
Nonstop3h 03m
Alaska Airlines
Deal found 3/1$90
This Cheapflightsfares deal was found by Cheapflights users on 3/3. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/154:20 pm
SEA
-
DEN
Nonstop2h 51m
Frontier
Mon 5/187:15 am
DEN
-
SEA
Nonstop3h 12m
Frontier
Deal found 3/3$91
This Frontier deal was found by Cheapflights users on 3/2. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/2712:24 pm
SEA
-
DEN
Nonstop2h 51m
Frontier
Fri 4/39:25 am
DEN
-
SEA
Nonstop3h 12m
Frontier
Deal found 3/2$92
This Expedia deal was found by Cheapflights users on 2/26. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/147:12 pm
SEA
-
DEN
Nonstop2h 47m
Multiple Airlines
Tue 4/216:03 pm
DEN
-
SEA
1 stop5h 25m
Multiple Airlines
Deal found 2/26$93

Find 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 March 3, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$79
(Expedia)

One-way from

$43
(Kiwi.com)

Popular in

June

Cheapest in

January

Average price

$217

Good round-trip deal

$206 or less

Good one-way deal

$149 or less
Provider with most accurate pricing for Seattle/Tacoma Intl-Denver Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-Denver Intl flights.
Search Deals
From Seattle/Tacoma Intl to Denver Intl
Search Deals
One-way flight from Seattle/Tacoma Intl to Denver Intl
Search Deals
Highest demand for flights based on searches. 8% potential increase in price ($20 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($3 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 2026
Search Deals
Price to beat on a round-trip flight from Seattle/Tacoma Intl to Denver Intl.
Search Deals
Price to beat on a one-way flight from Seattle/Tacoma Intl to Denver Intl.
Search Deals

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 March 3, 2026.
Use the filters below to find and compare flights from Seattle to Denver that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Wed 4/15

1:25 pm-5:10 pm

Nonstop2h 45m

Denver Intl

Wed 4/22

1:45 pm-10:55 pm

2 stops10h 10m

$112

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Fri 5/1

2:50 pm-11:45 pm

1 stop7h 55m

Denver Intl

Sat 5/9

2:45 pm-11:00 pm

2 stops9h 15m

$122

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Thu 4/23

1:17 pm-5:11 pm

Nonstop2h 54m

Denver Intl

Thu 4/23

7:25 pm-9:29 pm

Nonstop3h 04m

$132

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Tue 3/17

7:46 pm-11:32 pm

Nonstop2h 46m

Denver Intl

Tue 3/24

6:15 pm-12:03 am

1 stop6h 48m

$137

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Thu 5/14

7:59 pm-11:52 pm

Nonstop2h 53m

Denver Intl

Wed 5/20

6:05 am-8:09 am

Nonstop3h 04m

$137

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Sat 4/11

7:46 pm-11:32 pm

Nonstop2h 46m

Denver Intl

Thu 4/16

6:27 pm-11:59 pm

1 stop6h 32m

$147

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Fri 4/24

5:45 pm-12:45 am

1 stop6h 00m

Denver Intl

Sun 4/26

7:45 am-9:46 am

Nonstop3h 01m

$157

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Wed 3/25

2:35 pm-12:45 am

2 stops9h 10m

Denver Intl

Fri 3/27

8:10 pm-1:25 am

1 stop6h 15m

$172

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Tue 3/17

11:25 am-7:57 pm

1 stop7h 32m

Denver Intl

Fri 3/20

6:15 pm-12:03 am

1 stop6h 48m

$177

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Wed 5/20

7:50 am-11:49 am

Nonstop2h 59m

Denver Intl

Fri 5/29

6:05 am-8:09 am

Nonstop3h 04m

$187

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/1

Showing 1-10 of 23 resultsSorted by cheapest first
1
2
3

Compare providers for flights from Seattle to Denver

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 Seattle to Denver in March.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
CheapTicketsDealPrice Accuracy3 starsTrust Score*3 stars
CheapflightsfaresPrice Accuracy2 starsTrust Score*2 stars
CheapfaremartPrice Accuracy-Trust Score*1 star
JustAirTicketPrice Accuracy-Trust Score*1 star
PricelinePrice Accuracy1 starTrust Score*3 stars
MytripPrice Accuracy2 starsTrust Score*3 stars
GotogatePrice Accuracy2 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Seattle-Denver flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Seattle-Denver flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Seattle-Denver flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Seattle-Denver 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 Seattle-Denver 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 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 February 27, 2026.

To ensure you get the cheapest price possible for a flight from Seattle to Denver, you should look to book at least 69 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, January is the cheapest month in which you can book a flight from Seattle to Denver (average of $53). Flying from Seattle to Denver in July is currently the most expensive (average of $110). 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 March 3, 2026.

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 22% 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 February 21, 2026.

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

The best insider tips for Seattle to Denver 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 Seattle to Denver trip
Our travel experts
Marisa Garcia

Marisa Garcia

Expert on Frontier

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

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 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 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 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

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 March 3, 2026.
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
11,979 reviews

Food

7.1

Overall

8.0

Boarding

8.1

Comfort

7.8

Crew

8.5

Entertainment

7.0

Reviews

1 / 20
4.0
Okay

Anonymous,Dec 2025

SEA - MSY

I really got a lesson in upgrades. I let my seat get chosen . Both times a middle seat...on purpose ...even when we were not full. That's petty I sat behind the first class . They got more than 1 drink ...and a snack . .and the staff actually talked to them...behind a see thru shawl/sheet in the aisle....... You could see over the seats just fine and you could hear the voices just fine. But the sheet let You KNOW. Your not welcome here. For a moment I regretted not spending 300 dollars per seat so I could see a smile and eat a sandwhich and enjoy my seat . The married couple drank champain and laughed and flirted with each other. It looked so happy and care free MONEY really does buy happiness ..the hateful glares and sighs from my seat mates brought me back to reality I wasn't rich and I still had 2 hours left in this middle seat.
Alaska Airlines
8.0
Very good
11,979 reviews
Alaska Airlines
8.0
Very good
11,979 reviews

Food

7.1

Overall

8.0

Boarding

8.1

Comfort

7.8

Crew

8.5

Entertainment

7.0

Reviews

1 / 20
4.0
Okay

Anonymous,Dec 2025

SEA - MSY

I really got a lesson in upgrades. I let my seat get chosen . Both times a middle seat...on purpose ...even when we were not full. That's petty I sat behind the first class . They got more than 1 drink ...and a snack . .and the staff actually talked to them...behind a see thru shawl/sheet in the aisle....... You could see over the seats just fine and you could hear the voices just fine. But the sheet let You KNOW. Your not welcome here. For a moment I regretted not spending 300 dollars per seat so I could see a smile and eat a sandwhich and enjoy my seat . The married couple drank champain and laughed and flirted with each other. It looked so happy and care free MONEY really does buy happiness ..the hateful glares and sighs from my seat mates brought me back to reality I wasn't rich and I still had 2 hours left in this middle seat.
Southwest
8.0
Very good
4,305 reviews
Alaska Airlines
8.0
Very good
11,979 reviews

Food

7.1

Overall

8.0

Boarding

8.1

Comfort

7.8

Crew

8.5

Entertainment

7.0

Reviews

1 / 20
4.0
Okay

Anonymous,Dec 2025

SEA - MSY

I really got a lesson in upgrades. I let my seat get chosen . Both times a middle seat...on purpose ...even when we were not full. That's petty I sat behind the first class . They got more than 1 drink ...and a snack . .and the staff actually talked to them...behind a see thru shawl/sheet in the aisle....... You could see over the seats just fine and you could hear the voices just fine. But the sheet let You KNOW. Your not welcome here. For a moment I regretted not spending 300 dollars per seat so I could see a smile and eat a sandwhich and enjoy my seat . The married couple drank champain and laughed and flirted with each other. It looked so happy and care free MONEY really does buy happiness ..the hateful glares and sighs from my seat mates brought me back to reality I wasn't rich and I still had 2 hours left in this middle seat.
Delta
7.9
Good
8,242 reviews
Alaska Airlines
8.0
Very good
11,979 reviews

Food

7.1

Overall

8.0

Boarding

8.1

Comfort

7.8

Crew

8.5

Entertainment

7.0

Reviews

1 / 20
4.0
Okay

Anonymous,Dec 2025

SEA - MSY

I really got a lesson in upgrades. I let my seat get chosen . Both times a middle seat...on purpose ...even when we were not full. That's petty I sat behind the first class . They got more than 1 drink ...and a snack . .and the staff actually talked to them...behind a see thru shawl/sheet in the aisle....... You could see over the seats just fine and you could hear the voices just fine. But the sheet let You KNOW. Your not welcome here. For a moment I regretted not spending 300 dollars per seat so I could see a smile and eat a sandwhich and enjoy my seat . The married couple drank champain and laughed and flirted with each other. It looked so happy and care free MONEY really does buy happiness ..the hateful glares and sighs from my seat mates brought me back to reality I wasn't rich and I still had 2 hours left in this middle seat.
United Airlines
7.4
Good
9,380 reviews
Alaska Airlines
8.0
Very good
11,979 reviews

Food

7.1

Overall

8.0

Boarding

8.1

Comfort

7.8

Crew

8.5

Entertainment

7.0

Reviews

1 / 20
4.0
Okay

Anonymous,Dec 2025

SEA - MSY

I really got a lesson in upgrades. I let my seat get chosen . Both times a middle seat...on purpose ...even when we were not full. That's petty I sat behind the first class . They got more than 1 drink ...and a snack . .and the staff actually talked to them...behind a see thru shawl/sheet in the aisle....... You could see over the seats just fine and you could hear the voices just fine. But the sheet let You KNOW. Your not welcome here. For a moment I regretted not spending 300 dollars per seat so I could see a smile and eat a sandwhich and enjoy my seat . The married couple drank champain and laughed and flirted with each other. It looked so happy and care free MONEY really does buy happiness ..the hateful glares and sighs from my seat mates brought me back to reality I wasn't rich and I still had 2 hours left in this middle seat.
Frontier
5.7
Fair
3,041 reviews
Alaska Airlines
8.0
Very good
11,979 reviews

Food

7.1

Overall

8.0

Boarding

8.1

Comfort

7.8

Crew

8.5

Entertainment

7.0

Reviews

1 / 20
4.0
Okay

Anonymous,Dec 2025

SEA - MSY

I really got a lesson in upgrades. I let my seat get chosen . Both times a middle seat...on purpose ...even when we were not full. That's petty I sat behind the first class . They got more than 1 drink ...and a snack . .and the staff actually talked to them...behind a see thru shawl/sheet in the aisle....... You could see over the seats just fine and you could hear the voices just fine. But the sheet let You KNOW. Your not welcome here. For a moment I regretted not spending 300 dollars per seat so I could see a smile and eat a sandwhich and enjoy my seat . The married couple drank champain and laughed and flirted with each other. It looked so happy and care free MONEY really does buy happiness ..the hateful glares and sighs from my seat mates brought me back to reality I wasn't rich and I still had 2 hours left in this middle seat.

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 18 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 38m 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, 268 users have taken a look at flights from Seattle/Tacoma Intl to Denver Intl.

  • How long is the flight from Seattle to Denver?

    There are many flights that can get you from Seattle to Denver in 2h 45m. Fly via Delta or Southwest to get the fastest option. The distance between Seattle and Denver is about 1022 mi. Most flights are nonstop.

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

    Currently priced at $57, 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 Hawaiian Airlines and Delta - these airlines can fly you to your destination from $78 and $97, respectively. These flights start at 73% 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 $29. Users have also found prices from $58 and $71 on United Airlines and Delta, 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 (93%), KLM (93%) or Air France (92%) 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 $87. While the most popular route (Seattle/Tacoma Intl - Denver Intl) can be booked for $55 on average, our data indicates $619 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, January is the cheapest month in which you can book a flight from Seattle to Denver (average of $53). Flying from Seattle to Denver in July is currently the most expensive (average of $110). 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 Denver?

Book flights to Denver if you plan to visit one of these locations
Thornton
Black Hawk
Lakewood
Broomfield
Westminster
Golden
Centennial
Greeley
Lone Tree
Wheat Ridge
Silverthorne
Cripple Creek
Winter Park
Central City
Glendale
Manitou Springs
Frisco
Fort Morgan
Brighton
Evergreen

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

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 March 3, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$57Average$164FlexibilityNo cancel feeOn-time62%
Hawaiian AirlinesCheapest$78Average$216FlexibilityNo cancel feeOn-time85%
DeltaCheapest$97Average$235FlexibilityNo cancel feeOn-timeN/A
Alaska AirlinesCheapest$117Average$282FlexibilityNo cancel feeOn-time75%
SouthwestCheapest$125Average$253FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$132Average$295FlexibilityNo cancel feeOn-time69%

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