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 15/1. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — DEN
17 Jan — 24 Jan1
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 69 days in advance, depart on a Thursday or Saturday and return on a Thursday
Cheap flight deals from Seattle to Denver
Enter your travel dates to find the best prices.
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 18 December 2025.
Thu 25/121:25 p.m.SEA - DEN
Nonstop2h 53mFrontier
Mon 26/19:10 a.m.DEN - SEA
Nonstop3h 09mFrontier
Deal found 15/12C$ 227
Thu 25/121:25 p.m.SEA - DEN
Nonstop2h 53mMultiple Airlines
Mon 26/111:49 a.m.DEN - SEA
1 stop7h 54mMultiple Airlines
Deal found 15/12C$ 260
Wed 31/127:35 p.m.SEA - DEN
Nonstop2h 48mDelta
Wed 7/16:50 p.m.DEN - SEA
Nonstop3h 20mDelta
Deal found 17/12C$ 313
Sat 20/121:31 p.m.SEA - DEN
1 stop4h 43mFrontier
Thu 15/19:00 a.m.DEN - SEA
Nonstop3h 09mFrontier
Deal found 17/12C$ 353
Wed 24/127:35 p.m.SEA - DEN
Nonstop2h 48mDelta
Wed 7/14:10 p.m.DEN - SEA
1 stop8h 12mDelta
Deal found 17/12C$ 375
Thu 25/125:25 a.m.SEA - DEN
1 stop4h 40mDelta
Mon 26/16:23 p.m.DEN - SEA
1 stop6h 46mDelta
Deal found 15/12C$ 389
Tue 23/127:35 p.m.SEA - DEN
Nonstop2h 48mDelta
Wed 7/16:50 p.m.DEN - SEA
Nonstop3h 20mDelta
Deal found 17/12C$ 395
Sat 20/121:31 p.m.SEA - DEN
1 stop4h 43mMultiple Airlines
Thu 15/17:00 a.m.DEN - SEA
Nonstop3h 11mMultiple Airlines
Deal found 17/12C$ 404
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 18 December 2025.
Sat 17/17:40 p.m.SEA - DEN
Nonstop2h 45mDelta
Wed 21/16:29 a.m.DEN - SEA
Nonstop3h 11mDelta
Deal found 16/12C$ 161
Mon 19/15:15 a.m.SEA - DEN
Nonstop2h 35mSouthwest
Mon 26/18:25 p.m.DEN - SEA
Nonstop3h 05mSouthwest
Deal found 15/12C$ 161
Fri 9/17:54 p.m.SEA - DEN
Nonstop2h 41mAlaska Airlines
Mon 12/11:34 p.m.DEN - SEA
Nonstop3h 09mAlaska Airlines
Deal found 15/12C$ 161
Mon 19/15:00 a.m.SEA - DEN
Nonstop2h 48mUnited Airlines
Tue 20/17:45 a.m.DEN - SEA
Nonstop3h 10mUnited Airlines
Deal found 18/12C$ 161
Fri 9/11:45 p.m.SEA - DEN
Nonstop2h 49mDelta
Mon 12/16:29 a.m.DEN - SEA
Nonstop3h 11mDelta
Deal found 17/12C$ 161
Mon 9/33:16 p.m.SEA - DEN
Nonstop2h 40mAlaska Airlines
Tue 10/37:00 a.m.DEN - SEA
Nonstop3h 10mAlaska Airlines
Deal found 16/12C$ 161
Fri 30/17:40 p.m.SEA - DEN
Nonstop2h 45mDelta
Sat 7/26:50 p.m.DEN - SEA
Nonstop3h 20mDelta
Deal found 17/12C$ 161
Thu 19/27:40 p.m.SEA - DEN
Nonstop2h 45mDelta
Wed 25/212:30 p.m.DEN - SEA
Nonstop3h 11mDelta
Deal found 16/12C$ 161
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 18 December 2025.
Mon 19/112:19 p.m.SEA - DEN
Nonstop2h 51mFrontier
Mon 26/19:10 a.m.DEN - SEA
Nonstop3h 09mFrontier
Deal found 15/12C$ 96
Mon 12/17:54 p.m.SEA - DEN
Nonstop2h 41mAlaska Airlines
Tue 27/15:09 p.m.DEN - SEA
Nonstop3h 06mAlaska Airlines
Deal found 16/12C$ 161
Fri 13/212:00 p.m.SEA - DEN
Nonstop2h 50mFrontier
Mon 16/29:10 a.m.DEN - SEA
Nonstop3h 09mFrontier
Deal found 17/12C$ 164
Sat 17/18:55 a.m.SEA - DEN
Nonstop2h 43mAlaska Airlines
Sat 17/15:09 p.m.DEN - SEA
Nonstop3h 06mAlaska Airlines
Deal found 16/12C$ 189
Thu 1/11:25 p.m.SEA - DEN
Nonstop2h 53mFrontier
Mon 26/19:10 a.m.DEN - SEA
Nonstop3h 09mFrontier
Deal found 15/12C$ 200
Thu 15/15:00 a.m.SEA - DEN
Nonstop2h 48mUnited Airlines
Fri 16/17:45 a.m.DEN - SEA
Nonstop3h 10mUnited Airlines
Deal found 16/12C$ 201
Fri 16/17:40 p.m.SEA - DEN
Nonstop2h 45mDelta
Tue 20/16:50 p.m.DEN - SEA
Nonstop3h 20mDelta
Deal found 17/12C$ 216
Sun 11/112:26 p.m.SEA - DEN
Nonstop2h 51mFrontier
Thu 15/19:00 a.m.DEN - SEA
Nonstop3h 09mFrontier
Deal found 17/12C$ 227
Mon 19/18:55 a.m.SEA - DEN
Nonstop2h 43mAlaska Airlines
Sat 24/15:09 p.m.DEN - SEA
Nonstop3h 06mAlaska Airlines
Deal found 17/12C$ 230
Tue 10/38:30 a.m.SEA - DEN
Nonstop2h 44mAlaska Airlines
Thu 12/37:52 p.m.DEN - SEA
Nonstop3h 08mAlaska Airlines
Deal found 16/12C$ 258
Thu 8/17:40 p.m.SEA - DEN
Nonstop2h 45mDelta
Sun 11/16:29 a.m.DEN - SEA
Nonstop3h 11mDelta
Deal found 17/12C$ 267
Last-minute flights from Seattle to Denver
Discover last-minute flight deals from Seattle to Denver. Data last updated 18 December 2025 and is based on user searches.
Thu 1/11:25 p.m.SEA - DEN
Nonstop2h 53mFrontier
Mon 26/19:10 a.m.DEN - SEA
Nonstop3h 09mFrontier
Deal found 15/12C$ 200
Thu 8/16:05 a.m.SEA - DEN
Nonstop2h 35mSouthwest
Thu 8/11:10 p.m.DEN - SEA
1 stop8h 10mSouthwest
Deal found 17/12C$ 203
Fri 9/112:26 p.m.SEA - DEN
Nonstop2h 51mFrontier
Mon 12/18:00 a.m.DEN - SEA
1 stop12h 47mFrontier
Deal found 15/12C$ 167
Sat 10/16:25 a.m.SEA - DEN
2 stops7h 35mSouthwest
Sun 11/18:45 p.m.DEN - SEA
Nonstop3h 05mSouthwest
Deal found 18/12C$ 209
Mon 12/17:54 p.m.SEA - DEN
Nonstop2h 41mAlaska Airlines
Sat 24/15:09 p.m.DEN - SEA
Nonstop3h 06mAlaska Airlines
Deal found 16/12C$ 161
Tue 13/17:40 p.m.SEA - DEN
Nonstop2h 45mDelta
Mon 26/16:23 p.m.DEN - SEA
1 stop6h 46mDelta
Deal found 16/12C$ 175
Tue 13/14:33 p.m.SEA - DEN
1 stop6h 25mAlaska Airlines
Wed 28/112:34 p.m.DEN - SEA
1 stop7h 37mAlaska Airlines
Deal found 16/12C$ 215
Thu 15/15:00 a.m.SEA - DEN
Nonstop2h 48mUnited Airlines
Fri 16/17:45 a.m.DEN - SEA
Nonstop3h 10mUnited Airlines
Deal found 16/12C$ 201
Fri 16/17:40 p.m.SEA - DEN
Nonstop2h 45mDelta
Tue 20/16:50 p.m.DEN - SEA
Nonstop3h 20mDelta
Deal found 16/12C$ 216
Sun 18/15:25 a.m.SEA - DEN
1 stop5h 29mDelta
Wed 28/16:23 p.m.DEN - SEA
1 stop6h 46mDelta
Deal found 16/12C$ 189
Mon 19/112:19 p.m.SEA - DEN
Nonstop2h 51mFrontier
Mon 26/19:10 a.m.DEN - SEA
Nonstop3h 09mFrontier
Deal found 15/12C$ 96
Mon 19/112:19 p.m.SEA - DEN
Nonstop2h 51mMultiple Airlines
Mon 26/111:49 a.m.DEN - SEA
1 stop7h 54mMultiple Airlines
Deal found 15/12C$ 128
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 18 December 2025.
Mon 12/17:40 p.m.SEA - DEN
Nonstop2h 45mDelta
Deal found 16/12C$ 81
Tue 6/13:29 p.m.SEA - DEN
1 stop4h 59mAlaska Airlines
Deal found 16/12C$ 94
Sun 18/15:25 a.m.SEA - DEN
1 stop5h 29mDelta
Deal found 17/12C$ 95
Mon 9/22:36 p.m.SEA - DEN
1 stop8h 22mAlaska Airlines
Deal found 16/12C$ 107
Thu 19/27:10 a.m.SEA - DEN
1 stop9h 38mAlaska Airlines
Deal found 15/12C$ 116
Fri 13/36:30 a.m.SEA - DEN
1 stop6h 55mSouthwest
Deal found 16/12C$ 121
Sat 24/16:25 a.m.SEA - DEN
2 stops7h 35mSouthwest
Deal found 16/12C$ 130
Sat 28/26:35 a.m.SEA - DEN
2 stops10h 15mSouthwest
Deal found 15/12C$ 136
Fri 6/26:05 a.m.SEA - DEN
2 stops6h 50mSouthwest
Deal found 16/12C$ 143
Sat 17/14:33 p.m.SEA - DEN
1 stop6h 25mAlaska Airlines
Deal found 17/12C$ 149
Fri 16/17:40 p.m.SEA - DEN
Nonstop2h 45mDelta
Deal found 18/12C$ 150
Tue 20/17:28 p.m.SEA - DEN
2 stops27h 30mAlaska Airlines
Deal found 17/12C$ 154
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 18 December 2025.
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 18 December 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
Sat 17/1
7:40 p.m.-11:25 p.m.
Nonstop2h 45m
Denver Intl
Wed 21/1
6:29 a.m.-8:40 a.m.
Nonstop3h 11m
C$ 161
SeattleDenver
SEA - DEN
SEADEN
Seattle/Tacoma Intl
Mon 19/1
5:15 a.m.-8:50 a.m.
Nonstop2h 35m
Denver Intl
Mon 26/1
8:25 p.m.-10:30 p.m.
Nonstop3h 05m
C$ 161
SeattleDenver
SEA - DEN
SEADEN
Seattle/Tacoma Intl
Fri 9/1
7:54 p.m.-11:35 p.m.
Nonstop2h 41m
Denver Intl
Mon 12/1
1:34 p.m.-3:43 p.m.
Nonstop3h 09m
C$ 161
SeattleDenver
SEA - DEN
SEADEN
Seattle/Tacoma Intl
Mon 19/1
5:00 a.m.-8:48 a.m.
Nonstop2h 48m
Denver Intl
Tue 20/1
7:45 a.m.-9:55 a.m.
Nonstop3h 10m
C$ 161
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
6:29 a.m.-8:40 a.m.
Nonstop3h 11m
C$ 161
SeattleDenver
SEA - DEN
SEADEN
Seattle/Tacoma Intl
Mon 9/3
3:16 p.m.-6:56 p.m.
Nonstop2h 40m
Denver Intl
Tue 10/3
7:00 a.m.-9:10 a.m.
Nonstop3h 10m
C$ 161
SeattleDenver
SEA - DEN
SEADEN
Seattle/Tacoma Intl
Fri 30/1
7:40 p.m.-11:25 p.m.
Nonstop2h 45m
Denver Intl
Sat 7/2
6:50 p.m.-9:10 p.m.
Nonstop3h 20m
C$ 161
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
12:30 p.m.-2:41 p.m.
Nonstop3h 11m
C$ 161
SeattleDenver
SEA - DEN
SEADEN
Seattle/Tacoma Intl
Thu 15/1
5:15 a.m.-8:50 a.m.
Nonstop2h 35m
C$ 81
SeattleDenver
SEA - DEN
SEADEN
Seattle/Tacoma Intl
Thu 5/2
7:40 p.m.-11:25 p.m.
Nonstop2h 45m
C$ 81
Flights are sorted by cheapest round-trip flights first.
Deals found on 17/12
Showing 1-10 of 19 results
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.
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 12 December 2025.
The best time to book flights from Seattle to Denver is 69 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$ 50). Flying from Seattle to Denver in July is currently the most expensive (average of C$ 138). 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 18 December 2025.
Unlike in the morning, when flights are generally more expensive, you can save up to 35% 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 December 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. Saturday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.
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 18 December 2025.
The most flights from SEA to DEN are scheduled on a Thursday (45 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (5 on average).
How often are flights from Seattle to Denver delayed?
About 18% of weekly flights between Seattle and Denver have experienced delays in the past year, with the average delay time being 134 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 Sunday 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 18 December 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.
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.
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.
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.
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.
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.
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 14 flights from Seattle/Tacoma Intl to Denver Intl, all of which are around 2h 35m 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 225 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 Southwest, Alaska Airlines, or United Airlines 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$ 60), Delta (C$ 80), and Southwest (C$ 115) 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: United Airlines (95%), Virgin Atlantic (94%), ANA( 93%).
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$ 243, our data indicates the cheapest price to be C$ 80. The most popular route (Seattle/Tacoma Intl - Denver Intl), is priced around C$ 161.
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$ 50). Flying from Seattle to Denver in July is currently the most expensive (average of C$ 138). 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 18 December 2025.
Browse through other flights departing from Seattle. Flights are based on user searches made on Cheapflights and were last updated on 18 December 2025.
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 18 December 2025.
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.