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 29/5. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — DEN
17 May — 24 May1
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 September, booked 66 days in advance, depart on a Thursday or Saturday and return on a Wednesday
Cheap flight deals from Seattle to Denver
Enter your travel dates to find the best prices.
Cheapest
Best
Direct
Last-minute
One-way
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 April 2026.
Thu 28/53:19 p.m.
SEA
-
DEN
Nonstop2h 59m
Frontier
Mon 1/610:39 p.m.
DEN
-
SEA
1 stop20h 56m
Frontier
Deal found 13/4C$ 210
Sat 9/56:52 p.m.
SEA
-
DEN
Nonstop3h 00m
Frontier
Tue 12/57:50 a.m.
DEN
-
SEA
Nonstop2h 59m
Frontier
Deal found 15/4C$ 218
Mon 27/410:57 a.m.
SEA
-
DEN
1 stop23h 37m
Frontier
Wed 6/57:50 a.m.
DEN
-
SEA
Nonstop2h 59m
Frontier
Deal found 14/4C$ 225
Fri 29/57:50 p.m.
SEA
-
DEN
Nonstop3h 04m
Frontier
Sat 30/58:41 a.m.
DEN
-
SEA
1 stop11h 24m
Frontier
Deal found 14/4C$ 232
Thu 28/53:19 p.m.
SEA
-
DEN
Nonstop2h 59m
Frontier
Sat 30/57:00 a.m.
DEN
-
SEA
1 stop12h 35m
Frontier
Deal found 14/4C$ 239
Tue 5/57:50 p.m.
SEA
-
DEN
Nonstop3h 04m
Frontier
Wed 6/57:20 a.m.
DEN
-
SEA
1 stop12h 15m
Frontier
Deal found 14/4C$ 262
Thu 28/53:19 p.m.
SEA
-
DEN
Nonstop2h 59m
Multiple Airlines
Sat 30/56:00 a.m.
DEN
-
SEA
Nonstop3h 05m
Multiple Airlines
Deal found 14/4C$ 267
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 April 2026.
Tue 5/52:41 p.m.
SEA
-
DEN
1 stop8h 18m
Alaska Airlines
Wed 6/56:00 a.m.
DEN
-
SEA
Nonstop3h 03m
Alaska Airlines
Deal found 13/4C$ 325
Thu 28/55:30 a.m.
SEA
-
DEN
Nonstop2h 35m
Southwest
Sat 30/59:00 a.m.
DEN
-
SEA
2 stops11h 40m
Southwest
Deal found 14/4C$ 402
Thu 28/59:40 a.m.
SEA
-
DEN
2 stops8h 20m
Southwest
Mon 1/66:25 p.m.
DEN
-
SEA
1 stop7h 30m
Southwest
Deal found 13/4C$ 421
Sat 9/510:22 a.m.
SEA
-
DEN
1 stop7h 03m
Alaska Airlines
Tue 12/51:02 p.m.
DEN
-
SEA
1 stop7h 55m
Alaska Airlines
Deal found 16/4C$ 436
Fri 29/59:40 a.m.
SEA
-
DEN
2 stops8h 20m
Southwest
Mon 1/66:25 p.m.
DEN
-
SEA
1 stop7h 30m
Southwest
Deal found 13/4C$ 421
Wed 3/66:50 a.m.
SEA
-
DEN
2 stops7h 15m
Southwest
Mon 8/61:25 p.m.
DEN
-
SEA
2 stops7h 05m
Southwest
Deal found 12/4C$ 428
Wed 20/56:50 a.m.
SEA
-
DEN
2 stops7h 15m
Southwest
Thu 28/53:20 p.m.
DEN
-
SEA
2 stops8h 45m
Southwest
Deal found 15/4C$ 428
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 April 2026.
Sat 9/56:52 p.m.
SEA
-
DEN
Nonstop3h 00m
Frontier
Tue 12/57:50 a.m.
DEN
-
SEA
Nonstop2h 59m
Frontier
Deal found 15/4C$ 218
Thu 28/53:19 p.m.
SEA
-
DEN
Nonstop2h 59m
Multiple Airlines
Sat 30/56:00 a.m.
DEN
-
SEA
Nonstop3h 05m
Multiple Airlines
Deal found 12/4C$ 239
Fri 29/57:50 p.m.
SEA
-
DEN
Nonstop3h 04m
Frontier
Sat 30/58:00 a.m.
DEN
-
SEA
Nonstop3h 06m
Frontier
Deal found 14/4C$ 243
Mon 27/47:12 p.m.
SEA
-
DEN
Nonstop2h 47m
Frontier
Wed 6/57:50 a.m.
DEN
-
SEA
Nonstop2h 59m
Frontier
Deal found 14/4C$ 250
Thu 28/53:19 p.m.
SEA
-
DEN
Nonstop2h 59m
Multiple Airlines
Sun 31/56:00 a.m.
DEN
-
SEA
Nonstop3h 05m
Multiple Airlines
Deal found 13/4C$ 269
Wed 6/55:05 a.m.
SEA
-
DEN
Nonstop2h 44m
United Airlines
Wed 13/58:58 p.m.
DEN
-
SEA
Nonstop3h 01m
United Airlines
Deal found 15/4C$ 298
Sat 9/56:00 p.m.
SEA
-
DEN
Nonstop2h 49m
Alaska Airlines
Tue 12/58:00 a.m.
DEN
-
SEA
Nonstop3h 07m
Alaska Airlines
Deal found 16/4C$ 299
Sat 9/57:59 p.m.
SEA
-
DEN
Nonstop2h 53m
Delta
Mon 11/56:35 p.m.
DEN
-
SEA
Nonstop3h 02m
Delta
Deal found 13/4C$ 311
Sat 23/57:59 p.m.
SEA
-
DEN
Nonstop2h 53m
Delta
Sun 24/56:05 a.m.
DEN
-
SEA
Nonstop3h 04m
Delta
Deal found 13/4C$ 313
Last-minute flights from Seattle to Denver
Discover last-minute flight deals from Seattle to Denver. Data last updated 17 April 2026 and is based on user searches.
Mon 27/410:57 a.m.
SEA
-
DEN
1 stop23h 37m
Frontier
Wed 6/57:50 a.m.
DEN
-
SEA
Nonstop2h 59m
Frontier
Deal found 14/4C$ 225
Tue 5/57:50 p.m.
SEA
-
DEN
Nonstop3h 04m
Frontier
Wed 6/57:20 a.m.
DEN
-
SEA
1 stop12h 15m
Frontier
Deal found 14/4C$ 262
Sat 9/56:52 p.m.
SEA
-
DEN
Nonstop3h 00m
Frontier
Tue 12/57:50 a.m.
DEN
-
SEA
Nonstop2h 59m
Frontier
Deal found 15/4C$ 218
Thu 28/53:19 p.m.
SEA
-
DEN
Nonstop2h 59m
Frontier
Mon 1/610:39 p.m.
DEN
-
SEA
1 stop20h 56m
Frontier
Deal found 13/4C$ 210
Thu 28/53:19 p.m.
SEA
-
DEN
Nonstop2h 59m
Frontier
Sat 30/57:00 a.m.
DEN
-
SEA
1 stop12h 35m
Frontier
Deal found 14/4C$ 239
Thu 28/53:19 p.m.
SEA
-
DEN
Nonstop2h 59m
Multiple Airlines
Sat 30/56:00 a.m.
DEN
-
SEA
Nonstop3h 05m
Multiple Airlines
Deal found 14/4C$ 267
Fri 29/57:50 p.m.
SEA
-
DEN
Nonstop3h 04m
Frontier
Sat 30/58:41 a.m.
DEN
-
SEA
1 stop11h 24m
Frontier
Deal found 14/4C$ 232
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 April 2026.
Fri 29/58:20 p.m.
SEA
-
DEN
1 stop6h 05m
Frontier
Deal found 14/4C$ 139
Mon 27/47:12 p.m.
SEA
-
DEN
Nonstop2h 47m
Frontier
Deal found 14/4C$ 141
Wed 20/511:06 a.m.
SEA
-
DEN
1 stop21h 58m
Frontier
Deal found 15/4C$ 147
Sat 9/57:55 a.m.
SEA
-
DEN
Nonstop2h 59m
Delta
Deal found 13/4C$ 150
Thu 14/57:59 p.m.
SEA
-
DEN
Nonstop2h 53m
Delta
Deal found 16/4C$ 163
Sat 9/511:15 a.m.
SEA
-
DEN
2 stops7h 45m
Southwest
Deal found 16/4C$ 170
Wed 13/54:47 p.m.
SEA
-
DEN
1 stop6h 02m
Alaska Airlines
Deal found 13/4C$ 177
Wed 20/56:50 a.m.
SEA
-
DEN
2 stops7h 15m
Southwest
Deal found 15/4C$ 184
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 April 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 April 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
Quickest round-trip
SeattleDenver
SEA - DEN
SEADEN
Seattle/Tacoma Intl
Tue 5/5
2:41 p.m.-11:59 p.m.
1 stop8h 18m
Denver Intl
Wed 6/5
6:00 a.m.-8:03 a.m.
Nonstop3h 03m
C$ 325
SeattleDenver
SEA - DEN
SEADEN
Seattle/Tacoma Intl
Thu 28/5
5:30 a.m.-9:05 a.m.
Nonstop2h 35m
Denver Intl
Sat 30/5
9:00 a.m.-7:40 p.m.
2 stops11h 40m
C$ 402
SeattleDenver
SEA - DEN
SEADEN
Seattle/Tacoma Intl
Thu 28/5
9:40 a.m.-7:00 p.m.
2 stops8h 20m
Denver Intl
Mon 1/6
6:25 p.m.-12:55 a.m.
1 stop7h 30m
C$ 421
SeattleDenver
SEA - DEN
SEADEN
Seattle/Tacoma Intl
Fri 29/5
9:40 a.m.-7:00 p.m.
2 stops8h 20m
Denver Intl
Mon 1/6
6:25 p.m.-12:55 a.m.
1 stop7h 30m
C$ 421
SeattleDenver
SEA - DEN
SEADEN
Seattle/Tacoma Intl
Wed 3/6
6:50 a.m.-3:05 p.m.
2 stops7h 15m
Denver Intl
Mon 8/6
1:25 p.m.-7:30 p.m.
2 stops7h 05m
C$ 428
SeattleDenver
SEA - DEN
SEADEN
Seattle/Tacoma Intl
Wed 20/5
6:50 a.m.-3:05 p.m.
2 stops7h 15m
Denver Intl
Thu 28/5
3:20 p.m.-11:05 p.m.
2 stops8h 45m
C$ 428
SeattleDenver
SEA - DEN
SEADEN
Seattle/Tacoma Intl
Sat 9/5
10:22 a.m.-6:25 p.m.
1 stop7h 03m
Denver Intl
Tue 12/5
1:02 p.m.-7:57 p.m.
1 stop7h 55m
C$ 436
Cheapest one-way
SeattleDenver
SEA - DEN
SEADEN
Seattle/Tacoma Intl
Tue 12/5
7:55 a.m.-11:54 a.m.
Nonstop2h 59m
C$ 150
SeattleDenver
SEA - DEN
SEADEN
Seattle/Tacoma Intl
Mon 11/5
7:59 p.m.-11:52 p.m.
Nonstop2h 53m
C$ 163
SeattleDenver
SEA - DEN
SEADEN
Seattle/Tacoma Intl
Tue 12/5
7:50 a.m.-5:10 p.m.
2 stops8h 20m
C$ 170
Flights are sorted by cheapest round-trip flights first.
Deals found on 13/4
Showing 1-10 of 19 resultsSorted by cheapest first
1
2
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?
Use this chart to determine the optimal time to book a round-trip flight from Seattle to Denver. Price data was last updated on 10 April 2026.
The best time to book flights from Seattle to Denver is 66 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$ 218). Flying from Seattle to Denver in June is currently the most expensive (average of C$ 354). 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 April 2026.
Unlike in the morning, when flights are generally more expensive, you can save up to 24% 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 11 April 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. Saturday afternoons 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 April 2026.
The most flights from SEA to DEN are scheduled on a Friday (36 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (11 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 136 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 11% 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 April 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.
I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
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 25 flights from Seattle/Tacoma Intl to Denver Intl, all of which are around 2h 48m 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 151 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 35m. Fly via Alaska Airlines or Southwest 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$ 62), Delta (C$ 80), and Southwest (C$ 114) 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 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: Condor (96%), STARLUX Airlines (95%), Icelandair( 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$ 417, our data indicates the cheapest price to be C$ 80. The most popular route (Seattle/Tacoma Intl - Denver Intl), is priced around C$ 224.
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$ 218). Flying from Seattle to Denver in June is currently the most expensive (average of C$ 354). 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 17 April 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 17 April 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.
100% Free
Cheapflights is completely free to use, so you can start saving the moment you arrive.
Book with Flexibility
Our users can plan ahead with confidence and find flights with no change fees
Travel Smart
Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.
We value your privacy
Cheapflights and its partners wish to use cookies or similar technologies to store and/or access information on and about your device and process personal data such as your IP address, device identifiers etc., in order to improve your experience on the site, to analyze navigation, to offer and measure personalized advertising, and to facilitate sharing on social networks. We also allow the use of third-party cookies (including those from our advertising partners) on our sites.
By clicking 'Accept', you consent to your data being processed by 0 vendors on this web site for the purposes described in this notice. You can review the vendors and their individual processing purposes on the .
To review individual processing purposes and cookie categories, please click ’Select individual purposes’. You can review and update your choices anytime by clicking the ’Privacy Preferences’ link in the page side navigation.