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 27/1. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — DEN
11 Jan — 18 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 12 December 2025.
Wed 31/125:02 a.m.SEA - DEN
Nonstop2h 49mUnited Airlines
Wed 7/17:45 a.m.DEN - SEA
Nonstop3h 10mUnited Airlines
Deal found 9/12C$ 203
Wed 31/129:25 a.m.SEA - DEN
2 stops7h 35mSouthwest
Wed 7/18:25 p.m.DEN - SEA
Nonstop3h 05mSouthwest
Deal found 9/12C$ 292
Wed 31/127:35 p.m.SEA - DEN
Nonstop2h 48mDelta
Wed 7/16:50 p.m.DEN - SEA
Nonstop3h 20mDelta
Deal found 12/12C$ 299
Wed 17/126:15 a.m.SEA - DEN
2 stops6h 55mSouthwest
Wed 7/18:25 p.m.DEN - SEA
Nonstop3h 05mSouthwest
Deal found 10/12C$ 313
Thu 25/121:25 p.m.SEA - DEN
Nonstop2h 53mFrontier
Fri 2/16:35 a.m.DEN - SEA
1 stop8h 19mFrontier
Deal found 9/12C$ 354
Thu 18/127:40 a.m.SEA - DEN
Nonstop2h 52mDelta
Wed 14/14:10 p.m.DEN - SEA
1 stop8h 12mDelta
Deal found 9/12C$ 361
Mon 29/127:48 p.m.SEA - DEN
1 stop12h 07mFrontier
Fri 2/16:35 a.m.DEN - SEA
1 stop8h 19mFrontier
Deal found 9/12C$ 383
Fri 26/122:54 p.m.SEA - DEN
Nonstop2h 49mFrontier
Sat 3/110:00 a.m.DEN - SEA
1 stop4h 54mFrontier
Deal found 9/12C$ 400
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 12 December 2025.
Fri 16/15:15 a.m.SEA - DEN
Nonstop2h 35mSouthwest
Tue 20/18:25 p.m.DEN - SEA
Nonstop3h 05mSouthwest
Deal found 11/12C$ 134
Tue 17/21:40 p.m.SEA - DEN
Nonstop2h 47mDelta
Mon 23/26:40 a.m.DEN - SEA
Nonstop3h 11mDelta
Deal found 10/12C$ 134
Mon 19/15:15 a.m.SEA - DEN
Nonstop2h 35mSouthwest
Sat 24/17:00 p.m.DEN - SEA
Nonstop3h 05mSouthwest
Deal found 11/12C$ 134
Mon 23/27:40 p.m.SEA - DEN
Nonstop2h 45mDelta
Wed 25/212:30 p.m.DEN - SEA
Nonstop3h 11mDelta
Deal found 10/12C$ 134
Thu 19/27:40 p.m.SEA - DEN
Nonstop2h 45mDelta
Fri 20/26:40 a.m.DEN - SEA
Nonstop3h 11mDelta
Deal found 11/12C$ 134
Thu 19/27:40 p.m.SEA - DEN
Nonstop2h 45mDelta
Wed 25/26:50 p.m.DEN - SEA
Nonstop3h 18mDelta
Deal found 10/12C$ 134
Wed 18/27:40 p.m.SEA - DEN
Nonstop2h 45mDelta
Fri 20/26:40 a.m.DEN - SEA
Nonstop3h 11mDelta
Deal found 11/12C$ 134
Wed 7/17:40 p.m.SEA - DEN
Nonstop2h 45mDelta
Fri 9/16:29 a.m.DEN - SEA
Nonstop3h 11mDelta
Deal found 11/12C$ 134
Fri 9/11:45 p.m.SEA - DEN
Nonstop2h 49mDelta
Mon 12/16:29 a.m.DEN - SEA
Nonstop3h 11mDelta
Deal found 9/12C$ 134
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 12 December 2025.
Thu 15/112:19 p.m.SEA - DEN
Nonstop2h 51mFrontier
Sun 18/19:00 a.m.DEN - SEA
Nonstop3h 09mFrontier
Deal found 10/12C$ 95
Mon 23/27:40 p.m.SEA - DEN
Nonstop2h 45mDelta
Wed 25/212:30 p.m.DEN - SEA
Nonstop3h 11mDelta
Deal found 10/12C$ 134
Fri 9/11:45 p.m.SEA - DEN
Nonstop2h 49mDelta
Mon 12/16:29 a.m.DEN - SEA
Nonstop3h 11mDelta
Deal found 11/12C$ 135
Thu 8/17:54 p.m.SEA - DEN
Nonstop2h 41mAlaska Airlines
Mon 12/17:00 a.m.DEN - SEA
Nonstop3h 11mAlaska Airlines
Deal found 9/12C$ 148
Sat 28/21:36 p.m.SEA - DEN
Nonstop2h 44mAlaska Airlines
Sat 28/27:52 p.m.DEN - SEA
Nonstop3h 08mAlaska Airlines
Deal found 10/12C$ 153
Thu 8/17:54 p.m.SEA - DEN
Nonstop2h 41mAlaska Airlines
Thu 15/11:34 p.m.DEN - SEA
Nonstop3h 09mAlaska Airlines
Deal found 11/12C$ 161
Fri 16/15:15 a.m.SEA - DEN
Nonstop2h 35mSouthwest
Tue 20/18:25 p.m.DEN - SEA
Nonstop3h 05mSouthwest
Deal found 10/12C$ 175
Fri 20/24:30 p.m.SEA - DEN
Nonstop2h 30mSouthwest
Mon 23/28:45 p.m.DEN - SEA
Nonstop3h 05mSouthwest
Deal found 12/12C$ 189
Fri 16/17:40 p.m.SEA - DEN
Nonstop2h 45mDelta
Tue 20/112:30 p.m.DEN - SEA
Nonstop3h 13mDelta
Deal found 10/12C$ 203
Thu 26/21:36 p.m.SEA - DEN
Nonstop2h 44mAlaska Airlines
Thu 26/27:52 p.m.DEN - SEA
Nonstop3h 08mAlaska Airlines
Deal found 9/12C$ 208
Thu 1/17:35 p.m.SEA - DEN
Nonstop2h 48mDelta
Wed 14/112:30 p.m.DEN - SEA
Nonstop3h 13mDelta
Deal found 11/12C$ 217
Sun 29/312:40 p.m.SEA - DEN
Nonstop2h 41mAlaska Airlines
Wed 8/47:00 a.m.DEN - SEA
Nonstop3h 07mAlaska Airlines
Deal found 10/12C$ 229
Last-minute flights from Seattle to Denver
Discover last-minute flight deals from Seattle to Denver. Data last updated 12 December 2025 and is based on user searches.
Wed 17/126:15 a.m.SEA - DEN
2 stops6h 55mSouthwest
Wed 7/18:25 p.m.DEN - SEA
Nonstop3h 05mSouthwest
Deal found 10/12C$ 313
Wed 17/127:40 a.m.SEA - DEN
Nonstop2h 52mDelta
Sun 21/126:04 p.m.DEN - SEA
Nonstop3h 10mDelta
Deal found 10/12C$ 506
Wed 17/125:15 a.m.SEA - DEN
1 stop7h 20mSouthwest
Sun 21/1210:35 p.m.DEN - SEA
Nonstop3h 00mSouthwest
Deal found 10/12C$ 520
Thu 18/127:40 a.m.SEA - DEN
Nonstop2h 52mDelta
Wed 14/14:10 p.m.DEN - SEA
1 stop8h 12mDelta
Deal found 9/12C$ 361
Thu 18/121:19 p.m.SEA - DEN
1 stop7h 09mAlaska Airlines
Wed 14/112:34 p.m.DEN - SEA
2 stops9h 00mAlaska Airlines
Deal found 9/12C$ 490
Mon 22/121:19 p.m.SEA - DEN
1 stop7h 09mAlaska Airlines
Wed 31/127:20 a.m.DEN - SEA
1 stop8h 35mAlaska Airlines
Deal found 10/12C$ 530
Mon 22/121:35 p.m.SEA - DEN
Nonstop2h 39mDelta
Wed 31/126:05 a.m.DEN - SEA
Nonstop3h 15mDelta
Deal found 10/12C$ 548
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 12 December 2025.
Tue 10/37:45 p.m.SEA - DEN
Nonstop2h 45mDelta
Deal found 9/12C$ 68
Tue 6/19:57 a.m.SEA - DEN
1 stop7h 18mAlaska Airlines
Deal found 10/12C$ 80
Tue 10/29:25 a.m.SEA - DEN
1 stop4h 50mDelta
Deal found 10/12C$ 81
Thu 8/15:25 a.m.SEA - DEN
1 stop5h 29mDelta
Deal found 12/12C$ 95
Fri 16/111:30 a.m.SEA - DEN
1 stop6h 10mSouthwest
Deal found 10/12C$ 108
Sat 10/16:25 a.m.SEA - DEN
2 stops7h 35mSouthwest
Deal found 10/12C$ 116
Tue 3/28:45 a.m.SEA - DEN
1 stop6h 15mSouthwest
Deal found 10/12C$ 121
Thu 5/25:00 a.m.SEA - DEN
Nonstop2h 48mUnited Airlines
Deal found 10/12C$ 123
Sun 11/16:05 a.m.SEA - DEN
2 stops6h 40mSouthwest
Deal found 10/12C$ 130
Mon 16/25:00 a.m.SEA - DEN
Nonstop2h 35mSouthwest
Deal found 10/12C$ 137
Wed 18/29:30 a.m.SEA - DEN
2 stops10h 20mSouthwest
Deal found 10/12C$ 143
Tue 13/18:38 a.m.SEA - DEN
2 stops14h 20mAlaska Airlines
Deal found 12/12C$ 148
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 12 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 12 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
Fri 16/1
5:15 a.m.-8:50 a.m.
Nonstop2h 35m
Denver Intl
Tue 20/1
8:25 p.m.-10:30 p.m.
Nonstop3h 05m
C$ 134
SeattleDenver
SEA - DEN
SEADEN
Seattle/Tacoma Intl
Tue 17/2
1:40 p.m.-5:27 p.m.
Nonstop2h 47m
Denver Intl
Mon 23/2
6:40 a.m.-8:51 a.m.
Nonstop3h 11m
C$ 134
SeattleDenver
SEA - DEN
SEADEN
Seattle/Tacoma Intl
Mon 19/1
5:15 a.m.-8:50 a.m.
Nonstop2h 35m
Denver Intl
Sat 24/1
7:00 p.m.-9:05 p.m.
Nonstop3h 05m
C$ 134
SeattleDenver
SEA - DEN
SEADEN
Seattle/Tacoma Intl
Mon 23/2
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$ 134
SeattleDenver
SEA - DEN
SEADEN
Seattle/Tacoma Intl
Thu 19/2
7:40 p.m.-11:25 p.m.
Nonstop2h 45m
Denver Intl
Fri 20/2
6:40 a.m.-8:51 a.m.
Nonstop3h 11m
C$ 134
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$ 134
SeattleDenver
SEA - DEN
SEADEN
Seattle/Tacoma Intl
Wed 18/2
7:40 p.m.-11:25 p.m.
Nonstop2h 45m
Denver Intl
Fri 20/2
6:40 a.m.-8:51 a.m.
Nonstop3h 11m
C$ 134
SeattleDenver
SEA - DEN
SEADEN
Seattle/Tacoma Intl
Wed 7/1
7:40 p.m.-11:25 p.m.
Nonstop2h 45m
Denver Intl
Fri 9/1
6:29 a.m.-8:40 a.m.
Nonstop3h 11m
C$ 134
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$ 134
SeattleDenver
SEA - DEN
SEADEN
Seattle/Tacoma Intl
Tue 27/1
7:40 p.m.-11:25 p.m.
Nonstop2h 45m
C$ 68
Flights are sorted by cheapest round-trip flights first.
Deals found on 10/12
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
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 5 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$ 68). 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 12 December 2025.
Unlike in the morning, when flights are generally more expensive, you can save up to 37% 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 6 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 12 December 2025.
The most flights from SEA to DEN are scheduled on a Thursday (39 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (18 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 12 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 27 flights from Seattle/Tacoma Intl to Denver Intl, all of which are around 2h 49m 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 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$ 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 (93%), Copa Airlines (91%), Icelandair( 91%).
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$ 312, our data indicates the cheapest price to be C$ 87. The most popular route (Seattle/Tacoma Intl - Denver Intl), is priced around C$ 105.
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$ 68). 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 12 December 2025.
Browse through other flights departing from Seattle. Flights are based on user searches made on Cheapflights and were last updated on 12 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 12 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.
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