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 29/9. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — DEN
31 Aug — 7 Sep1
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 74 days in advance, depart on a Thursday or Friday and return on a Wednesday
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 1 August 2026.
Sat 17/107:41 p.m.
SEA
-
DEN
Nonstop2h 53m
Frontier
Wed 21/107:45 a.m.
DEN
-
SEA
Nonstop3h 06m
Frontier
Deal found 29/7C$ 209
Tue 29/94:27 p.m.
SEA
-
DEN
Nonstop2h 54m
Frontier
Mon 5/109:05 a.m.
DEN
-
SEA
1 stop12h 35m
Frontier
Deal found 1/8C$ 214
Thu 27/87:06 p.m.
SEA
-
DEN
Nonstop2h 52m
Frontier
Thu 3/96:10 a.m.
DEN
-
SEA
1 stop10h 18m
Frontier
Deal found 29/7C$ 226
Tue 25/82:37 p.m.
SEA
-
DEN
Nonstop2h 56m
Frontier
Sat 29/88:45 a.m.
DEN
-
SEA
1 stop11h 53m
Frontier
Deal found 28/7C$ 235
Fri 11/94:27 p.m.
SEA
-
DEN
Nonstop2h 54m
Frontier
Sun 13/91:07 p.m.
DEN
-
SEA
Nonstop3h 01m
Frontier
Deal found 30/7C$ 248
Fri 4/97:06 p.m.
SEA
-
DEN
Nonstop2h 52m
Frontier
Sat 5/97:15 a.m.
DEN
-
SEA
Nonstop3h 04m
Frontier
Deal found 31/7C$ 256
Fri 28/87:06 p.m.
SEA
-
DEN
Nonstop2h 52m
Frontier
Fri 4/98:45 a.m.
DEN
-
SEA
1 stop12h 17m
Frontier
Deal found 31/7C$ 263
Fri 21/88:07 p.m.
SEA
-
DEN
Nonstop2h 51m
Delta
Sun 23/86:20 a.m.
DEN
-
SEA
Nonstop2h 59m
Delta
Deal found 30/7C$ 276
Thu 20/88:07 p.m.
SEA
-
DEN
Nonstop2h 51m
Delta
Sun 23/86:20 a.m.
DEN
-
SEA
Nonstop2h 59m
Delta
Deal found 28/7C$ 277
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 1 August 2026.
Thu 20/83:40 p.m.
SEA
-
DEN
1 stop6h 20m
Southwest
Sun 23/86:35 p.m.
DEN
-
SEA
1 stop7h 15m
Southwest
Deal found 27/7C$ 311
Sat 17/102:59 p.m.
SEA
-
DEN
1 stop6h 13m
Alaska Airlines
Wed 21/1012:31 p.m.
DEN
-
SEA
1 stop6h 31m
Alaska Airlines
Deal found 30/7C$ 314
Sat 15/89:40 a.m.
SEA
-
DEN
1 stop4h 22m
Delta
Sat 22/86:28 p.m.
DEN
-
SEA
1 stop4h 37m
Delta
Deal found 31/7C$ 388
Fri 28/83:25 p.m.
SEA
-
DEN
2 stops7h 20m
Southwest
Wed 9/94:15 p.m.
DEN
-
SEA
Nonstop2h 55m
Southwest
Deal found 30/7C$ 346
Tue 25/82:18 p.m.
SEA
-
DEN
1 stop5h 55m
Alaska Airlines
Sat 29/81:43 p.m.
DEN
-
SEA
1 stop7h 09m
Alaska Airlines
Deal found 27/7C$ 374
Mon 24/86:15 p.m.
SEA
-
DEN
Nonstop2h 45m
Southwest
Fri 28/82:05 p.m.
DEN
-
SEA
2 stops8h 10m
Southwest
Deal found 27/7C$ 360
Thu 27/89:10 a.m.
SEA
-
DEN
1 stop8h 05m
Southwest
Thu 3/910:15 a.m.
DEN
-
SEA
2 stops7h 45m
Southwest
Deal found 29/7C$ 396
Wed 11/118:05 a.m.
SEA
-
DEN
1 stop6h 20m
Southwest
Wed 18/1112:30 p.m.
DEN
-
SEA
2 stops7h 05m
Southwest
Deal found 30/7C$ 404
Tue 10/119:20 a.m.
SEA
-
DEN
1 stop8h 55m
Southwest
Tue 17/1112:30 p.m.
DEN
-
SEA
2 stops7h 05m
Southwest
Deal found 30/7C$ 404
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 1 August 2026.
Sat 17/107:41 p.m.
SEA
-
DEN
Nonstop2h 53m
Frontier
Wed 21/107:45 a.m.
DEN
-
SEA
Nonstop3h 06m
Frontier
Deal found 29/7C$ 209
Thu 27/82:37 p.m.
SEA
-
DEN
Nonstop2h 56m
Frontier
Thu 3/97:15 a.m.
DEN
-
SEA
Nonstop3h 04m
Frontier
Deal found 29/7C$ 228
Fri 11/94:27 p.m.
SEA
-
DEN
Nonstop2h 54m
Frontier
Sun 13/91:07 p.m.
DEN
-
SEA
Nonstop3h 01m
Frontier
Deal found 30/7C$ 248
Fri 4/97:06 p.m.
SEA
-
DEN
Nonstop2h 52m
Frontier
Sat 5/97:15 a.m.
DEN
-
SEA
Nonstop3h 04m
Frontier
Deal found 31/7C$ 256
Fri 18/94:27 p.m.
SEA
-
DEN
Nonstop2h 54m
Frontier
Mon 21/91:07 p.m.
DEN
-
SEA
Nonstop3h 01m
Frontier
Deal found 29/7C$ 263
Fri 21/88:07 p.m.
SEA
-
DEN
Nonstop2h 51m
Delta
Sun 23/86:20 a.m.
DEN
-
SEA
Nonstop2h 59m
Delta
Deal found 30/7C$ 276
Thu 20/88:07 p.m.
SEA
-
DEN
Nonstop2h 51m
Delta
Sun 23/86:20 a.m.
DEN
-
SEA
Nonstop2h 59m
Delta
Deal found 28/7C$ 277
Sat 22/85:40 p.m.
SEA
-
DEN
Nonstop2h 45m
Southwest
Sun 30/87:50 p.m.
DEN
-
SEA
Nonstop2h 55m
Southwest
Deal found 28/7C$ 290
Fri 14/87:06 p.m.
SEA
-
DEN
Nonstop2h 52m
Frontier
Wed 19/87:15 a.m.
DEN
-
SEA
Nonstop3h 04m
Frontier
Deal found 31/7C$ 296
Fri 28/87:06 p.m.
SEA
-
DEN
Nonstop2h 52m
Frontier
Fri 4/97:15 a.m.
DEN
-
SEA
Nonstop3h 04m
Frontier
Deal found 31/7C$ 303
Last-minute flights from Seattle to Denver
Discover last-minute flight deals from Seattle to Denver. Data last updated 1 August 2026 and is based on user searches.
Fri 14/87:06 p.m.
SEA
-
DEN
Nonstop2h 52m
Frontier
Wed 19/87:15 a.m.
DEN
-
SEA
Nonstop3h 04m
Frontier
Deal found 31/7C$ 296
Thu 20/88:07 p.m.
SEA
-
DEN
Nonstop2h 51m
Delta
Sun 23/86:20 a.m.
DEN
-
SEA
Nonstop2h 59m
Delta
Deal found 28/7C$ 277
Fri 21/88:07 p.m.
SEA
-
DEN
Nonstop2h 51m
Delta
Sun 23/86:20 a.m.
DEN
-
SEA
Nonstop2h 59m
Delta
Deal found 29/7C$ 276
Sat 22/85:40 p.m.
SEA
-
DEN
Nonstop2h 45m
Southwest
Sun 30/87:50 p.m.
DEN
-
SEA
Nonstop2h 55m
Southwest
Deal found 28/7C$ 290
Sun 23/88:07 p.m.
SEA
-
DEN
Nonstop2h 51m
Delta
Fri 28/86:28 p.m.
DEN
-
SEA
1 stop4h 37m
Delta
Deal found 28/7C$ 297
Tue 25/82:37 p.m.
SEA
-
DEN
Nonstop2h 56m
Frontier
Sat 29/88:45 a.m.
DEN
-
SEA
1 stop11h 53m
Frontier
Deal found 28/7C$ 235
Thu 27/87:06 p.m.
SEA
-
DEN
Nonstop2h 52m
Frontier
Thu 3/96:10 a.m.
DEN
-
SEA
1 stop10h 18m
Frontier
Deal found 29/7C$ 226
Fri 28/87:06 p.m.
SEA
-
DEN
Nonstop2h 52m
Frontier
Fri 4/98:45 a.m.
DEN
-
SEA
1 stop12h 17m
Frontier
Deal found 31/7C$ 263
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 1 August 2026.
Tue 29/98:15 p.m.
SEA
-
DEN
1 stop20h 17m
Frontier
Deal found 1/8C$ 132
Sun 30/88:07 p.m.
SEA
-
DEN
Nonstop2h 51m
Delta
Deal found 29/7C$ 139
Fri 21/83:45 p.m.
SEA
-
DEN
Nonstop2h 45m
Southwest
Deal found 27/7C$ 146
Fri 30/107:00 p.m.
SEA
-
DEN
1 stop7h 52m
Frontier
Deal found 30/7C$ 150
Thu 20/811:50 a.m.
SEA
-
DEN
1 stop5h 55m
Southwest
Deal found 29/7C$ 153
Sat 29/85:30 a.m.
SEA
-
DEN
1 stop5h 17m
Delta
Deal found 29/7C$ 160
Fri 28/83:25 p.m.
SEA
-
DEN
2 stops7h 20m
Southwest
Deal found 29/7C$ 167
Wed 30/96:15 p.m.
SEA
-
DEN
Nonstop2h 50m
Southwest
Deal found 28/7C$ 174
Tue 1/98:40 a.m.
SEA
-
DEN
Nonstop2h 46m
Delta
Deal found 31/7C$ 181
Tue 26/17:40 p.m.
SEA
-
DEN
Nonstop2h 48m
Delta
Deal found 29/7C$ 188
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 1 August 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 1 August 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
Thu 20/8
3:40 p.m.-11:00 p.m.
1 stop6h 20m
Denver Intl
Sun 23/8
6:35 p.m.-12:50 a.m.
1 stop7h 15m
C$ 311
SeattleDenver
SEA - DEN
SEADEN
Seattle/Tacoma Intl
Sat 17/10
2:59 p.m.-10:12 p.m.
1 stop6h 13m
Denver Intl
Wed 21/10
12:31 p.m.-6:02 p.m.
1 stop6h 31m
C$ 314
SeattleDenver
SEA - DEN
SEADEN
Seattle/Tacoma Intl
Fri 28/8
3:25 p.m.-11:45 p.m.
2 stops7h 20m
Denver Intl
Wed 9/9
4:15 p.m.-6:10 p.m.
Nonstop2h 55m
C$ 346
SeattleDenver
SEA - DEN
SEADEN
Seattle/Tacoma Intl
Mon 24/8
6:15 p.m.-10:00 p.m.
Nonstop2h 45m
Denver Intl
Fri 28/8
2:05 p.m.-9:15 p.m.
2 stops8h 10m
C$ 360
SeattleDenver
SEA - DEN
SEADEN
Seattle/Tacoma Intl
Tue 25/8
2:18 p.m.-9:13 p.m.
1 stop5h 55m
Denver Intl
Sat 29/8
1:43 p.m.-7:52 p.m.
1 stop7h 09m
C$ 374
Quickest round-trip
SeattleDenver
SEA - DEN
SEADEN
Seattle/Tacoma Intl
Sat 15/8
9:40 a.m.-3:02 p.m.
1 stop4h 22m
Denver Intl
Sat 22/8
6:28 p.m.-10:05 p.m.
1 stop4h 37m
C$ 388
SeattleDenver
SEA - DEN
SEADEN
Seattle/Tacoma Intl
Thu 27/8
9:10 a.m.-6:15 p.m.
1 stop8h 05m
Denver Intl
Thu 3/9
10:15 a.m.-5:00 p.m.
2 stops7h 45m
C$ 396
SeattleDenver
SEA - DEN
SEADEN
Seattle/Tacoma Intl
Wed 11/11
8:05 a.m.-3:25 p.m.
1 stop6h 20m
Denver Intl
Wed 18/11
12:30 p.m.-6:35 p.m.
2 stops7h 05m
C$ 404
SeattleDenver
SEA - DEN
SEADEN
Seattle/Tacoma Intl
Tue 10/11
9:20 a.m.-7:15 p.m.
1 stop8h 55m
Denver Intl
Tue 17/11
12:30 p.m.-6:35 p.m.
2 stops7h 05m
C$ 404
Cheapest one-way
SeattleDenver
SEA - DEN
SEADEN
Seattle/Tacoma Intl
Wed 28/10
8:00 p.m.-11:55 p.m.
Nonstop2h 55m
C$ 188
Flights are sorted by cheapest round-trip flights first.
Deals found on 29/7
Showing 1-10 of 21 resultsSorted by cheapest first
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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.
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 73 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$ 226). Flying from Seattle to Denver in June is currently the most expensive (average of C$ 472). 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 1 August 2026.
Unlike in the morning, when flights are generally more expensive, you can save up to 19% 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 July 2026.
Travelers seeking maximum savings on their Seattle to Denver flight should consider departing on Sunday afternoons 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?
Airfare is below average for this route at the moment.
Seattle to Denver flights typically cost between C$ 234 and C$ 451 in October.The cheapest round-trip price found within the last 5 days was C$ 209 on Frontier (17 Oct-21 Oct).
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 1 August 2026.
The most flights from SEA to DEN are scheduled on a Friday (48 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (9 on average).
How often are flights from Seattle to Denver delayed?
About 17% of weekly flights between Seattle and Denver have experienced delays in the past year, with the average delay time being 135 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 9% 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 1 August 2026.
Read through reviews of airlines operating flights from Seattle to Denver, such as Southwest,Alaska Airlines, andDelta. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
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 24 flights from Seattle/Tacoma Intl to Denver Intl, all of which are around 2h 43m 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 124 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 6h 13m. Fly via Southwest or Alaska Airlines 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 (93%), Japan Airlines (88%), United Airlines( 84%).
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$ 346, our data indicates the cheapest price to be C$ 88. The most popular route (Seattle/Tacoma Intl - Denver Intl), is priced around C$ 240.
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$ 226). Flying from Seattle to Denver in June is currently the most expensive (average of C$ 472). 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.
Explore flights to Denver departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on 1 August 2026.
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 1 August 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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