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 17/8. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — DEN
17 Jul — 24 Jul1
Round-trip
1 adult
Economy
Round-trip
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 66 days in advance, depart on a Thursday or Saturday and return on a Tuesday
Cheap flight deals from Seattle to Denver
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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 17 June 2026.
Thu 8/107:41 p.m.
SEA
-
DEN
Nonstop2h 53m
Frontier
Sun 11/107:45 a.m.
DEN
-
SEA
Nonstop3h 06m
Frontier
Deal found 16/6C$ 246
Sat 29/87:41 p.m.
SEA
-
DEN
Nonstop2h 55m
Frontier
Tue 1/97:45 a.m.
DEN
-
SEA
Nonstop3h 03m
Frontier
Deal found 16/6C$ 274
Tue 22/99:16 p.m.
SEA
-
DEN
1 stop5h 36m
Frontier
Wed 23/97:30 a.m.
DEN
-
SEA
1 stop6h 30m
Frontier
Deal found 12/6C$ 286
Wed 26/87:06 p.m.
SEA
-
DEN
Nonstop2h 52m
Frontier
Sun 30/87:15 a.m.
DEN
-
SEA
Nonstop3h 04m
Frontier
Deal found 17/6C$ 301
Thu 8/107:41 p.m.
SEA
-
DEN
Nonstop2h 53m
Frontier
Mon 12/107:45 a.m.
DEN
-
SEA
Nonstop3h 06m
Frontier
Deal found 12/6C$ 323
Mon 14/97:41 p.m.
SEA
-
DEN
Nonstop2h 53m
Frontier
Sun 20/910:29 p.m.
DEN
-
SEA
Nonstop2h 58m
Frontier
Deal found 13/6C$ 332
Best flights from Seattle to Denver
Discover carefully curated flight deals from Seattle to Denver that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated 17 June 2026.
Sat 22/85:40 p.m.
SEA
-
DEN
Nonstop2h 45m
Southwest
Sat 29/89:15 a.m.
DEN
-
SEA
1 stop5h 25m
Southwest
Deal found 15/6C$ 435
Sat 15/811:44 a.m.
SEA
-
DEN
Nonstop2h 54m
Alaska Airlines
Sat 15/86:15 p.m.
DEN
-
SEA
Nonstop3h 02m
Alaska Airlines
Deal found 12/6C$ 441
Thu 23/78:10 a.m.
SEA
-
DEN
Nonstop2h 52m
Delta
Thu 23/77:09 p.m.
DEN
-
SEA
1 stop5h 50m
Delta
Deal found 13/6C$ 497
Sat 29/810:18 a.m.
SEA
-
DEN
1 stop8h 08m
Alaska Airlines
Wed 2/91:43 p.m.
DEN
-
SEA
1 stop6h 09m
Alaska Airlines
Deal found 15/6C$ 455
Wed 5/88:30 a.m.
SEA
-
DEN
1 stop7h 35m
Southwest
Sat 8/81:30 p.m.
DEN
-
SEA
2 stops8h 00m
Southwest
Deal found 14/6C$ 462
Mon 10/85:45 a.m.
SEA
-
DEN
1 stop5h 19m
Delta
Sat 29/86:28 p.m.
DEN
-
SEA
1 stop4h 37m
Delta
Deal found 14/6C$ 497
Tue 25/86:25 a.m.
SEA
-
DEN
1 stop5h 35m
Southwest
Tue 1/912:50 p.m.
DEN
-
SEA
2 stops8h 25m
Southwest
Deal found 14/6C$ 462
Tue 14/77:30 a.m.
SEA
-
DEN
2 stops7h 20m
Southwest
Tue 14/75:30 p.m.
DEN
-
SEA
2 stops7h 05m
Southwest
Deal found 13/6C$ 469
Sat 1/87:30 a.m.
SEA
-
DEN
2 stops9h 00m
Southwest
Tue 4/812:50 p.m.
DEN
-
SEA
2 stops8h 25m
Southwest
Deal found 13/6C$ 469
Sat 11/75:30 a.m.
SEA
-
DEN
2 stops7h 20m
Southwest
Sat 18/710:20 p.m.
DEN
-
SEA
Nonstop2h 55m
Southwest
Deal found 15/6C$ 477
Fri 17/77:30 a.m.
SEA
-
DEN
2 stops7h 35m
Southwest
Tue 21/75:30 p.m.
DEN
-
SEA
2 stops7h 05m
Southwest
Deal found 15/6C$ 498
Thu 8/107:55 a.m.
SEA
-
DEN
2 stops7h 35m
Southwest
Mon 12/105:55 a.m.
DEN
-
SEA
1 stop8h 15m
Southwest
Deal found 13/6C$ 518
Direct flights from Seattle to Denver
Explore direct flight options from Seattle to Denver based on user searches, and compare prices and availability for your desired travel dates. Data last updated 17 June 2026.
Thu 8/107:41 p.m.
SEA
-
DEN
Nonstop2h 53m
Frontier
Sun 11/107:45 a.m.
DEN
-
SEA
Nonstop3h 06m
Frontier
Deal found 16/6C$ 246
Sat 29/87:41 p.m.
SEA
-
DEN
Nonstop2h 55m
Frontier
Tue 1/97:45 a.m.
DEN
-
SEA
Nonstop3h 03m
Frontier
Deal found 16/6C$ 274
Wed 26/87:06 p.m.
SEA
-
DEN
Nonstop2h 52m
Frontier
Sun 30/87:15 a.m.
DEN
-
SEA
Nonstop3h 04m
Frontier
Deal found 17/6C$ 301
Thu 8/107:41 p.m.
SEA
-
DEN
Nonstop2h 53m
Frontier
Mon 12/107:45 a.m.
DEN
-
SEA
Nonstop3h 06m
Frontier
Deal found 12/6C$ 323
Mon 14/97:41 p.m.
SEA
-
DEN
Nonstop2h 53m
Frontier
Sun 20/910:29 p.m.
DEN
-
SEA
Nonstop2h 58m
Frontier
Deal found 13/6C$ 332
Tue 22/97:00 a.m.
SEA
-
DEN
Nonstop2h 51m
Frontier
Wed 23/910:29 p.m.
DEN
-
SEA
Nonstop2h 58m
Frontier
Deal found 12/6C$ 346
Fri 10/77:06 p.m.
SEA
-
DEN
Nonstop2h 52m
Frontier
Fri 17/77:13 a.m.
DEN
-
SEA
Nonstop3h 04m
Frontier
Deal found 12/6C$ 398
Thu 8/102:14 p.m.
SEA
-
DEN
Nonstop2h 46m
Multiple Airlines
Mon 12/107:45 a.m.
DEN
-
SEA
Nonstop3h 06m
Multiple Airlines
Deal found 13/6C$ 412
Wed 22/71:33 p.m.
SEA
-
DEN
Nonstop2h 47m
Alaska Airlines
Wed 22/79:08 p.m.
DEN
-
SEA
Nonstop3h 02m
Alaska Airlines
Deal found 13/6C$ 420
Tue 18/86:10 p.m.
SEA
-
DEN
Nonstop2h 45m
Southwest
Tue 25/89:05 a.m.
DEN
-
SEA
Nonstop2h 55m
Southwest
Deal found 15/6C$ 427
Last-minute flights from Seattle to Denver
Discover last-minute flight deals from Seattle to Denver. Data last updated 17 June 2026 and is based on user searches.
Tue 23/67:41 p.m.
SEA
-
DEN
Nonstop2h 55m
Frontier
Tue 30/64:26 p.m.
DEN
-
SEA
1 stop19h 09m
Frontier
Deal found 16/6C$ 448
Tue 7/712:35 p.m.
SEA
-
DEN
Nonstop3h 05m
Frontier
Tue 7/710:29 p.m.
DEN
-
SEA
1 stop13h 10m
Frontier
Deal found 17/6C$ 428
Fri 10/77:06 p.m.
SEA
-
DEN
Nonstop2h 52m
Frontier
Fri 17/78:45 a.m.
DEN
-
SEA
1 stop11h 53m
Frontier
Deal found 12/6C$ 368
Tue 14/77:35 a.m.
SEA
-
DEN
Nonstop2h 40m
Southwest
Tue 14/79:35 p.m.
DEN
-
SEA
Nonstop3h 00m
Southwest
Deal found 13/6C$ 427
Wed 15/75:15 a.m.
SEA
-
DEN
Nonstop2h 35m
Southwest
Wed 22/76:55 p.m.
DEN
-
SEA
1 stop5h 20m
Southwest
Deal found 16/6C$ 435
Fri 17/75:00 a.m.
SEA
-
DEN
Nonstop2h 43m
United Airlines
Tue 21/76:00 a.m.
DEN
-
SEA
Nonstop3h 00m
United Airlines
Deal found 15/6C$ 456
Wed 22/71:33 p.m.
SEA
-
DEN
Nonstop2h 47m
Alaska Airlines
Wed 22/79:08 p.m.
DEN
-
SEA
Nonstop3h 02m
Alaska Airlines
Deal found 13/6C$ 420
Wed 22/77:59 p.m.
SEA
-
DEN
Nonstop2h 45m
Delta
Sat 1/86:35 p.m.
DEN
-
SEA
1 stop4h 25m
Delta
Deal found 15/6C$ 455
Wed 29/77:30 a.m.
SEA
-
DEN
2 stops7h 20m
Southwest
Wed 5/89:10 a.m.
DEN
-
SEA
1 stop7h 00m
Southwest
Deal found 16/6C$ 462
One-way flights from Seattle to Denver
Search for one-way flight options from Seattle to Denver. Find affordable one-way fares based on user searches. Data last updated 17 June 2026.
Mon 17/87:06 p.m.
SEA
-
DEN
Nonstop2h 52m
Frontier
Deal found 14/6C$ 164
Thu 30/77:06 p.m.
SEA
-
DEN
Nonstop2h 52m
Frontier
Deal found 15/6C$ 165
Sun 16/87:06 p.m.
SEA
-
DEN
Nonstop2h 52m
Frontier
Deal found 14/6C$ 188
Sun 19/78:53 p.m.
SEA
-
DEN
1 stop5h 55m
Frontier
Deal found 15/6C$ 202
Sun 28/611:53 a.m.
SEA
-
DEN
1 stop20h 33m
Frontier
Deal found 13/6C$ 207
Wed 9/125:07 a.m.
SEA
-
DEN
Nonstop2h 43m
United Airlines
Deal found 16/6C$ 214
Tue 8/125:45 a.m.
SEA
-
DEN
1 stop6h 00m
Southwest
Deal found 16/6C$ 228
Tue 14/77:59 p.m.
SEA
-
DEN
Nonstop2h 45m
Delta
Deal found 16/6C$ 230
Sat 18/77:30 a.m.
SEA
-
DEN
2 stops8h 30m
Southwest
Deal found 16/6C$ 235
Thu 10/121:50 p.m.
SEA
-
DEN
Nonstop2h 45m
Delta
Deal found 16/6C$ 242
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 17 June 2026.
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 17 June 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
Cheapest round-trip
SeattleDenver
SEA - DEN
SEADEN
Seattle/Tacoma Intl
Sat 22/8
5:40 p.m.-9:25 p.m.
Nonstop2h 45m
Denver Intl
Sat 29/8
9:15 a.m.-1:40 p.m.
1 stop5h 25m
C$ 435
Quickest round-trip
SeattleDenver
SEA - DEN
SEADEN
Seattle/Tacoma Intl
Sat 15/8
11:44 a.m.-3:38 p.m.
Nonstop2h 54m
Denver Intl
Sat 15/8
6:15 p.m.-8:17 p.m.
Nonstop3h 02m
C$ 441
SeattleDenver
SEA - DEN
SEADEN
Seattle/Tacoma Intl
Sat 29/8
10:18 a.m.-7:26 p.m.
1 stop8h 08m
Denver Intl
Wed 2/9
1:43 p.m.-6:52 p.m.
1 stop6h 09m
C$ 455
SeattleDenver
SEA - DEN
SEADEN
Seattle/Tacoma Intl
Wed 5/8
8:30 a.m.-5:05 p.m.
1 stop7h 35m
Denver Intl
Sat 8/8
1:30 p.m.-8:30 p.m.
2 stops8h 00m
C$ 462
SeattleDenver
SEA - DEN
SEADEN
Seattle/Tacoma Intl
Tue 25/8
6:25 a.m.-1:00 p.m.
1 stop5h 35m
Denver Intl
Tue 1/9
12:50 p.m.-8:15 p.m.
2 stops8h 25m
C$ 462
SeattleDenver
SEA - DEN
SEADEN
Seattle/Tacoma Intl
Tue 14/7
7:30 a.m.-3:50 p.m.
2 stops7h 20m
Denver Intl
Tue 14/7
5:30 p.m.-11:35 p.m.
2 stops7h 05m
C$ 469
SeattleDenver
SEA - DEN
SEADEN
Seattle/Tacoma Intl
Sat 1/8
7:30 a.m.-5:30 p.m.
2 stops9h 00m
Denver Intl
Tue 4/8
12:50 p.m.-8:15 p.m.
2 stops8h 25m
C$ 469
SeattleDenver
SEA - DEN
SEADEN
Seattle/Tacoma Intl
Sat 11/7
5:30 a.m.-1:50 p.m.
2 stops7h 20m
Denver Intl
Sat 18/7
10:20 p.m.-12:15 a.m.
Nonstop2h 55m
C$ 477
SeattleDenver
SEA - DEN
SEADEN
Seattle/Tacoma Intl
Thu 23/7
8:10 a.m.-12:02 p.m.
Nonstop2h 52m
Denver Intl
Thu 23/7
7:09 p.m.-11:59 p.m.
1 stop5h 50m
C$ 497
SeattleDenver
SEA - DEN
SEADEN
Seattle/Tacoma Intl
Mon 10/8
5:45 a.m.-12:04 p.m.
1 stop5h 19m
Denver Intl
Sat 29/8
6:28 p.m.-10:05 p.m.
1 stop4h 37m
C$ 497
Flights are sorted by cheapest round-trip flights first.
Deals found on 12/6
Showing 1-10 of 24 resultsSorted by cheapest first
1
2
3
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.
SEA-DEN
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
Prices
Airlines
Delays
How far ahead should I book a flight from Seattle to Denver?
The best time to book flights from Seattle to Denver is 65 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$ 225). Flying from Seattle to Denver in June is currently the most expensive (average of C$ 445). 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 17 June 2026.
Unlike in the morning, when flights are generally more expensive, you can save up to 27% 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 13 June 2026.
Travelers seeking maximum savings on their Seattle to Denver flight should consider departing on Monday 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.
How much does it cost to fly round-trip from Seattle to Denver?
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 17 June 2026.
The most flights from SEA to DEN are scheduled on a Tuesday (38 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (20 on average).
How often are flights from Seattle to Denver delayed?
About 19% of weekly flights between Seattle and Denver have experienced delays in the past year, with the average delay time being 137 minutes.
What is the most punctual flight time for Seattle to Denver flights?
Historically, flights departing at night are less likely to be delayed, whereas flights leaving in the early afternoon tend to experience delays more often.
What day of the week experiences the fewest flight delays on this route?
Saturday tends to have the lowest number of delays on this route, whereas Friday has historically faced a higher average of delays compared to other days of the week.
Which airline has the best punctuality record on Seattle to Denver flights?
Over the past year, United Airlines has had the lowest number of delays on this route, with just 10% of flights being delayed.
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 17 June 2026.
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.
There was a delay and my husband needs a wheelchair and we were moved from 1 gate to another.
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 30 flights from Seattle/Tacoma Intl to Denver Intl, all of which are around 2h 45m 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 148 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 40m. Fly via Southwest, Alaska Airlines, or Delta to get the fastest option. There are 1645 km between Seattle and Denver. This flight may include one or multiple stops.
What are the cheapest airlines flying from Seattle to Denver round-trip?
According to our current data, Frontier (C$ 63), Delta (C$ 82), and Southwest (C$ 117) offers the cheapest pricing from Seattle to Denver. Users have found that Frontier is 80% cheaper than the other options available to this destination.
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 (92%), Japan Airlines (91%), United Airlines( 88%).
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$ 356, our data indicates the cheapest price to be C$ 251. The most popular route (Seattle/Tacoma Intl - Denver Intl), is priced around C$ 326.
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$ 225). Flying from Seattle to Denver in June is currently the most expensive (average of C$ 445). 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.
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 17 June 2026.
Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.
How does Cheapflights help users find flights from Seattle to Denver?
Cheapflights helps you search for flights from Seattle to Denver via 900+ travel sites so you don’t have to. After performing a flight search, users can also filter their flight selection by filtering for price, number of stops, airlines, and so on.
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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