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Cheap flights from Seattle to Denver from C$ 78

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 14/12. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — DEN
25 Dec — 1 Jan1
1 adult
1 adult, Economy, 0 bags

Cheapflights Tip: The best prices from Seattle/Tacoma Intl to Denver Intl are usually found in January or October, booked 77 days in advance, depart on a Sunday or Friday and return on a Saturday

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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 25 November 2025.

Sun 14/127:35 p.m.SEA - DEN
Nonstop2h 46mDelta
Tue 16/1212:25 p.m.DEN - SEA
Nonstop3h 08mDelta
Deal found 23/11C$ 154
Mon 15/127:55 a.m.SEA - DEN
Nonstop2h 49mAlaska Airlines
Mon 5/16:02 a.m.DEN - SEA
Nonstop3h 08mAlaska Airlines
Deal found 23/11C$ 159
Tue 30/128:35 p.m.SEA - DEN
Nonstop2h 30mSouthwest
Mon 5/110:35 p.m.DEN - SEA
Nonstop3h 00mSouthwest
Deal found 23/11C$ 165
Mon 15/125:25 a.m.SEA - DEN
1 stop4h 44mDelta
Mon 5/16:29 a.m.DEN - SEA
Nonstop3h 11mDelta
Deal found 23/11C$ 179
Tue 16/127:55 a.m.SEA - DEN
Nonstop2h 49mAlaska Airlines
Wed 31/126:02 a.m.DEN - SEA
Nonstop3h 08mAlaska Airlines
Deal found 24/11C$ 188
Fri 5/123:40 p.m.SEA - DEN
Nonstop2h 48mFrontier
Mon 8/126:00 a.m.DEN - SEA
1 stop11h 36mFrontier
Deal found 24/11C$ 189
Thu 18/128:17 p.m.SEA - DEN
Nonstop2h 42mAlaska Airlines
Wed 31/126:02 a.m.DEN - SEA
Nonstop3h 08mAlaska Airlines
Deal found 24/11C$ 193
Tue 30/121:25 p.m.SEA - DEN
1 stop4h 43mMultiple Airlines
Mon 5/16:02 a.m.DEN - SEA
Nonstop3h 08mMultiple Airlines
Deal found 23/11C$ 196
Sat 6/1212:48 p.m.SEA - DEN
Nonstop2h 51mFrontier
Sun 7/1210:37 p.m.DEN - SEA
1 stop12h 29mFrontier
Deal found 25/11C$ 199
Wed 17/1212:45 p.m.SEA - DEN
1 stop7h 43mAlaska Airlines
Wed 31/126:02 a.m.DEN - SEA
Nonstop3h 08mAlaska Airlines
Deal found 24/11C$ 202
Tue 30/128:17 p.m.SEA - DEN
Nonstop2h 42mAlaska Airlines
Tue 6/13:46 p.m.DEN - SEA
Nonstop3h 06mAlaska Airlines
Deal found 23/11C$ 207

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 25 November 2025.

Round-trip from

C$ 141

One-way from

C$ 78

Popular in

December

Cheapest in

January

Average price

C$ 313

Good round-trip deal

C$ 181 or less

Good one-way deal

C$ 184 or less
Frontier
  • Frontier
  • 21/1-26/1
  • 1 total stop
  • 11h 31m total
  • Seattle to Denver
Search Deals
United Airlines
  • United Airlines
  • 14/12
  • Nonstop
  • 2h 42m total
  • Seattle to Denver
Search Deals
Highest demand for flights based on searches. 0% potential increase in price (C$ 2 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (C$ 6 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in November 2025
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 629,999 searches. Data last updated 25 November 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

Tue 16/12

11:02 a.m.-2:46 p.m.

Nonstop2h 44m

Denver Intl

Wed 31/12

6:02 a.m.-8:10 a.m.

Nonstop3h 08m

C$ 159

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Fri 9/1

1:45 p.m.-5:34 p.m.

Nonstop2h 49m

Denver Intl

Mon 12/1

6:50 p.m.-9:10 p.m.

Nonstop3h 20m

C$ 165

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Tue 30/12

8:35 p.m.-12:05 a.m.

Nonstop2h 30m

Denver Intl

Mon 5/1

10:35 p.m.-12:35 a.m.

Nonstop3h 00m

C$ 165

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Thu 19/2

7:40 p.m.-11:25 p.m.

Nonstop2h 45m

Denver Intl

Wed 25/2

6:50 p.m.-9:08 p.m.

Nonstop3h 18m

C$ 165

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Fri 6/3

1:40 p.m.-5:27 p.m.

Nonstop2h 47m

Denver Intl

Mon 9/3

7:39 p.m.-9:50 p.m.

Nonstop3h 11m

C$ 165

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Sat 28/2

7:40 p.m.-11:25 p.m.

Nonstop2h 45m

Denver Intl

Fri 6/3

6:50 p.m.-9:08 p.m.

Nonstop3h 18m

C$ 165

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Fri 23/1

7:54 p.m.-11:35 p.m.

Nonstop2h 41m

Denver Intl

Sun 25/1

11:49 a.m.-6:43 p.m.

1 stop7h 54m

C$ 179

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Sun 11/1

7:40 p.m.-11:25 p.m.

Nonstop2h 45m

Denver Intl

Sun 18/1

12:49 p.m.-4:38 p.m.

1 stop4h 49m

C$ 179

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Wed 14/1

5:25 a.m.-11:54 a.m.

1 stop5h 29m

Denver Intl

Tue 20/1

6:23 p.m.-12:09 a.m.

1 stop6h 46m

C$ 193

SeattleDenver

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Sun 18/1

5:25 a.m.-11:54 a.m.

1 stop5h 29m

Denver Intl

Fri 23/1

6:23 p.m.-12:09 a.m.

1 stop6h 46m

C$ 193

Flights are sorted by cheapest round-trip flights first.

Deals found on 23/11

Showing 1-10 of 21 results
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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 21 November 2025.

The best time to book flights from Seattle to Denver is 77 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

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 C$ 65). Flying from Seattle to Denver in July is currently the most expensive (average of C$ 155). 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 25 November 2025.

Unlike in the morning, when flights are generally more expensive, you can save up to 42% on flights from Seattle to Denver by exploring options for tickets at noon.

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 25 November 2025.

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

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 25 November 2025.
Read through reviews of airlines operating flights from Seattle to Denver, such as Alaska Airlines,Southwest, andDelta. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
11,354 reviews
Check prices

Crew

8.5

Entertainment

7.0

Overall

8.0

Comfort

7.8

Food

7.1

Boarding

8.1

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.
Alaska Airlines
8.0
Very good
11,354 reviews
Alaska Airlines
8.0
Very good
11,354 reviews
Check prices

Crew

8.5

Entertainment

7.0

Overall

8.0

Comfort

7.8

Food

7.1

Boarding

8.1

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.
Southwest
8.0
Very good
4,254 reviews
Alaska Airlines
8.0
Very good
11,354 reviews
Check prices

Crew

8.5

Entertainment

7.0

Overall

8.0

Comfort

7.8

Food

7.1

Boarding

8.1

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.
Delta
7.9
Good
7,998 reviews
Alaska Airlines
8.0
Very good
11,354 reviews
Check prices

Crew

8.5

Entertainment

7.0

Overall

8.0

Comfort

7.8

Food

7.1

Boarding

8.1

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.
Hawaiian Airlines
7.8
Good
2,814 reviews
Alaska Airlines
8.0
Very good
11,354 reviews
Check prices

Crew

8.5

Entertainment

7.0

Overall

8.0

Comfort

7.8

Food

7.1

Boarding

8.1

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.
Frontier
5.8
Fair
3,099 reviews
Alaska Airlines
8.0
Very good
11,354 reviews
Check prices

Crew

8.5

Entertainment

7.0

Overall

8.0

Comfort

7.8

Food

7.1

Boarding

8.1

Reviews

1 / 20
8.0
Excellent

Anonymous,Sep 2025

SEA - MKE

The crew were excellent, flight good, but the actual space for a person to occupy for 4 hours seems to get smaller and smaller 🤣. I am not overweight, and average height….very uncomfortable,, especially when I couldn’t recliner the seat at all, and the pocket in front doesn’t accommodate a water bottle.

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?

    Booking a flight from Seattle/Tacoma Intl (SEA) to Denver Intl (DEN) is your only option if you wish to fly from Seattle to Denver. On a typical day, there are 26 flights from Seattle/Tacoma Intl to Denver Intl, all of which are around 2h 41m for a nonstop flight. You can also purchase a plane ticket from 5 airlines when you book a flight from Seattle/Tacoma Intl to Denver.

  • How popular is this Seattle to Denver flight route?

    This flight path from Seattle/Tacoma Intl to Denver Intl was viewed by 268 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

  • How long is the flight from Seattle to Denver?

    There are many flights that can get you from Seattle to Denver in 2h 44m. Fly via Alaska Airlines or Delta to get the fastest option. There are 1645 km between Seattle and Denver. All flights are typically direct.

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

    According to our current data, Frontier (C$ 61), Delta (C$ 110), and Southwest (C$ 118) offers the cheapest pricing from Seattle to Denver. Users have found that Frontier is 79% cheaper than the other options available to this destination.

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

    The cheapest airline one-way is Delta, with whom users have recently found tickets for as low as C$ 78. However, be on the lookout for offers from Alaska Airlines and United Airlines, as they are both options that can get you from Seattle to Denver for a low price.

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

    Before booking your flight to Denver from Seattle, check out the most reliable airlines to get you to your destination on time: SWISS (100%), STARLUX Airlines (100%), United Airlines( 92%).

  • What are the cheapest flights from Seattle to Denver?

    Looking for the cheapest flight from Seattle to Denver? While on average our users pay C$ 277, our data indicates the cheapest price to be C$ 55. The most popular route (Seattle/Tacoma Intl - Denver Intl), is priced around C$ 165.

  • 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 C$ 65). Flying from Seattle to Denver in July is currently the most expensive (average of C$ 155). 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

Travelling to a place near Denver?

Book flights to Denver if you plan to visit one of these locations
Golden
Westminster
Thornton

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Alternative routes for Seattle to Denver

See prices for flight routes from nearby airports that may be better suited for you.
Bellingham to Denver flights

Top 5 airlines flying from Seattle to Denver

Discover the top 5 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 629,999 searches. Data last updated 25 November 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapestC$ 61AverageC$ 198FlexibilityNo cancel feeOn-time62%
Search Frontier flights
DeltaCheapestC$ 110AverageC$ 244FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
SouthwestCheapestC$ 118AverageC$ 223FlexibilityNo cancel feeOn-time63%
Search Southwest flights
Hawaiian AirlinesCheapestC$ 182AverageC$ 293FlexibilityNo cancel feeOn-time85%
Search Hawaiian Airlines flights
Alaska AirlinesCheapestC$ 221AverageC$ 334FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights

Fly with Cheapflights

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How does Cheapflights help users find flights from Seattle to Denver?

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Why should you use Cheapflights to find cheap flight tickets from Seattle to Denver?

Millions of users choose and trust Cheapflights to book the best flight deals from Seattle to Denver for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

Can Cheapflights find flights from Seattle to Denver with no change fees?

Yes! Cheapflights helps users easily find flights from Seattle to Denver with no change fees.

Can Cheapflights notify me if prices for flights from Seattle to Denver become cheaper?

Yes, Cheapflights has a feature called Price Alert, which notifies users when flight prices change. Track prices for your flight to Denver from Seattle today and book when prices fit your budget.

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