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 10/2. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — DEN
7 Feb — 14 Feb1
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
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 8 January 2026.
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 8 January 2026.
Thu 19/28:14 p.m.SEA - DEN
Nonstop2h 45mAlaska Airlines
Wed 25/212:34 p.m.DEN - SEA
Nonstop3h 07mAlaska Airlines
Deal found 7/1C$ 126
Fri 27/28:14 p.m.SEA - DEN
Nonstop2h 45mMultiple Airlines
Sun 1/38:45 a.m.DEN - SEA
Nonstop3h 10mMultiple Airlines
Deal found 7/1C$ 127
Thu 19/21:16 p.m.SEA - DEN
Nonstop2h 51mFrontier
Wed 25/29:50 p.m.DEN - SEA
1 stop11h 23mFrontier
Deal found 7/1C$ 129
Thu 29/17:54 p.m.SEA - DEN
Nonstop2h 41mAlaska Airlines
Sat 7/27:00 a.m.DEN - SEA
Nonstop3h 11mAlaska Airlines
Deal found 8/1C$ 130
Sat 31/11:45 p.m.SEA - DEN
Nonstop2h 49mDelta
Thu 5/26:29 a.m.DEN - SEA
Nonstop3h 11mDelta
Deal found 7/1C$ 134
Mon 23/27:40 p.m.SEA - DEN
Nonstop2h 45mDelta
Fri 27/26:50 p.m.DEN - SEA
Nonstop3h 18mDelta
Deal found 6/1C$ 135
Wed 29/48:55 a.m.SEA - DEN
Nonstop2h 50mUnited Airlines
Fri 1/55:52 p.m.DEN - SEA
1 stop6h 37mUnited Airlines
Deal found 7/1C$ 138
Wed 4/210:10 a.m.SEA - DEN
1 stop6h 30mSouthwest
Mon 9/28:45 p.m.DEN - SEA
Nonstop3h 05mSouthwest
Deal found 8/1C$ 140
Sat 2/55:07 a.m.SEA - DEN
Nonstop2h 43mUnited Airlines
Sun 10/58:00 a.m.DEN - SEA
Nonstop2h 59mUnited Airlines
Deal found 7/1C$ 142
Wed 28/11:20 p.m.SEA - DEN
1 stop8h 05mSouthwest
Sun 1/28:45 p.m.DEN - SEA
Nonstop3h 05mSouthwest
Deal found 7/1C$ 144
Thu 5/29:30 a.m.SEA - DEN
2 stops9h 30mSouthwest
Mon 9/28:20 a.m.DEN - SEA
Nonstop3h 05mSouthwest
Deal found 7/1C$ 147
Fri 30/17:40 p.m.SEA - DEN
Nonstop2h 45mDelta
Sat 31/112:46 p.m.DEN - SEA
1 stop5h 05mDelta
Deal found 6/1C$ 148
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 8 January 2026.
Thu 19/28:14 p.m.SEA - DEN
Nonstop2h 45mAlaska Airlines
Wed 25/212:34 p.m.DEN - SEA
Nonstop3h 07mAlaska Airlines
Deal found 7/1C$ 126
Wed 11/25:00 a.m.SEA - DEN
Nonstop2h 48mUnited Airlines
Thu 12/28:54 p.m.DEN - SEA
Nonstop3h 05mUnited Airlines
Deal found 8/1C$ 126
Tue 21/48:30 a.m.SEA - DEN
Nonstop2h 42mDelta
Thu 23/46:54 a.m.DEN - SEA
Nonstop3h 08mDelta
Deal found 7/1C$ 134
Fri 30/16:05 a.m.SEA - DEN
Nonstop2h 35mSouthwest
Sun 1/28:20 a.m.DEN - SEA
Nonstop3h 05mSouthwest
Deal found 8/1C$ 134
Sat 7/27:54 p.m.SEA - DEN
Nonstop2h 41mAlaska Airlines
Mon 9/27:00 a.m.DEN - SEA
Nonstop3h 11mAlaska Airlines
Deal found 7/1C$ 130
Sat 31/15:00 a.m.SEA - DEN
Nonstop2h 48mUnited Airlines
Sat 31/17:08 p.m.DEN - SEA
Nonstop3h 07mUnited Airlines
Deal found 8/1C$ 134
Tue 7/47:45 p.m.SEA - DEN
Nonstop2h 46mDelta
Thu 9/46:30 a.m.DEN - SEA
Nonstop3h 08mDelta
Deal found 7/1C$ 134
Thu 19/211:30 a.m.SEA - DEN
1 stop6h 10mSouthwest
Tue 24/28:35 a.m.DEN - SEA
Nonstop3h 10mSouthwest
Deal found 8/1C$ 140
Mon 23/27:40 p.m.SEA - DEN
Nonstop2h 45mDelta
Fri 27/26:50 p.m.DEN - SEA
Nonstop3h 18mDelta
Deal found 7/1C$ 134
Wed 1/47:45 p.m.SEA - DEN
Nonstop2h 46mDelta
Fri 3/46:30 a.m.DEN - SEA
Nonstop3h 08mDelta
Deal found 7/1C$ 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 8 January 2026.
Thu 19/28:14 p.m.SEA - DEN
Nonstop2h 45mAlaska Airlines
Wed 25/212:34 p.m.DEN - SEA
Nonstop3h 07mAlaska Airlines
Deal found 7/1C$ 126
Fri 27/28:14 p.m.SEA - DEN
Nonstop2h 45mMultiple Airlines
Sun 1/38:45 a.m.DEN - SEA
Nonstop3h 10mMultiple Airlines
Deal found 7/1C$ 127
Thu 29/17:54 p.m.SEA - DEN
Nonstop2h 41mAlaska Airlines
Sat 7/27:00 a.m.DEN - SEA
Nonstop3h 11mAlaska Airlines
Deal found 8/1C$ 130
Sat 31/11:45 p.m.SEA - DEN
Nonstop2h 49mDelta
Sat 7/26:50 p.m.DEN - SEA
Nonstop3h 20mDelta
Deal found 8/1C$ 134
Mon 23/27:40 p.m.SEA - DEN
Nonstop2h 45mDelta
Fri 27/26:50 p.m.DEN - SEA
Nonstop3h 18mDelta
Deal found 6/1C$ 135
Sat 2/55:07 a.m.SEA - DEN
Nonstop2h 43mUnited Airlines
Sun 10/58:00 a.m.DEN - SEA
Nonstop2h 59mUnited Airlines
Deal found 7/1C$ 142
Thu 5/27:54 p.m.SEA - DEN
Nonstop2h 41mAlaska Airlines
Thu 12/27:00 a.m.DEN - SEA
Nonstop3h 10mAlaska Airlines
Deal found 8/1C$ 144
Wed 28/15:00 a.m.SEA - DEN
Nonstop2h 48mUnited Airlines
Fri 13/28:54 p.m.DEN - SEA
Nonstop3h 05mUnited Airlines
Deal found 8/1C$ 148
Wed 13/55:07 a.m.SEA - DEN
Nonstop2h 43mUnited Airlines
Mon 18/59:00 p.m.DEN - SEA
Nonstop2h 59mUnited Airlines
Deal found 8/1C$ 156
Sun 12/48:11 p.m.SEA - DEN
Nonstop2h 45mAlaska Airlines
Tue 14/47:24 p.m.DEN - SEA
Nonstop3h 09mAlaska Airlines
Deal found 7/1C$ 158
Thu 16/48:11 p.m.SEA - DEN
Nonstop2h 45mAlaska Airlines
Tue 21/47:00 a.m.DEN - SEA
Nonstop3h 10mAlaska Airlines
Deal found 7/1C$ 162
Wed 13/57:05 p.m.SEA - DEN
Nonstop2h 51mUnited Airlines
Sat 16/58:00 a.m.DEN - SEA
Nonstop2h 59mUnited Airlines
Deal found 7/1C$ 171
Last-minute flights from Seattle to Denver
Discover last-minute flight deals from Seattle to Denver. Data last updated 8 January 2026 and is based on user searches.
Wed 28/11:20 p.m.SEA - DEN
1 stop8h 05mSouthwest
Sun 1/28:45 p.m.DEN - SEA
Nonstop3h 05mSouthwest
Deal found 7/1C$ 144
Wed 28/11:20 p.m.SEA - DEN
2 stops7h 50mSouthwest
Sat 31/12:50 p.m.DEN - SEA
Nonstop3h 00mSouthwest
Deal found 7/1C$ 151
Thu 29/17:54 p.m.SEA - DEN
Nonstop2h 41mAlaska Airlines
Sat 7/27:00 a.m.DEN - SEA
Nonstop3h 11mAlaska Airlines
Deal found 8/1C$ 130
Fri 30/15:00 a.m.SEA - DEN
1 stop5h 51mDelta
Sun 1/26:29 a.m.DEN - SEA
Nonstop3h 11mDelta
Deal found 6/1C$ 148
Sat 31/17:40 p.m.SEA - DEN
Nonstop2h 45mDelta
Sat 7/26:50 p.m.DEN - SEA
Nonstop3h 20mDelta
Deal found 7/1C$ 134
Wed 4/25:15 a.m.SEA - DEN
1 stop5h 20mSouthwest
Wed 4/28:25 p.m.DEN - SEA
Nonstop3h 05mSouthwest
Deal found 8/1C$ 140
Wed 4/25:15 a.m.SEA - DEN
2 stops12h 50mSouthwest
Mon 9/28:45 p.m.DEN - SEA
Nonstop3h 05mSouthwest
Deal found 8/1C$ 155
Thu 5/29:30 a.m.SEA - DEN
2 stops9h 30mSouthwest
Thu 12/29:55 p.m.DEN - SEA
Nonstop3h 15mSouthwest
Deal found 8/1C$ 147
Thu 19/28:14 p.m.SEA - DEN
Nonstop2h 45mAlaska Airlines
Wed 25/212:34 p.m.DEN - SEA
Nonstop3h 07mAlaska Airlines
Deal found 7/1C$ 126
Thu 19/21:16 p.m.SEA - DEN
Nonstop2h 51mFrontier
Wed 25/29:50 p.m.DEN - SEA
1 stop11h 23mFrontier
Deal found 7/1C$ 129
Mon 23/27:40 p.m.SEA - DEN
Nonstop2h 45mDelta
Fri 27/26:50 p.m.DEN - SEA
Nonstop3h 18mDelta
Deal found 6/1C$ 135
Fri 27/28:14 p.m.SEA - DEN
Nonstop2h 45mMultiple Airlines
Sun 1/38:45 a.m.DEN - SEA
Nonstop3h 10mMultiple Airlines
Deal found 7/1C$ 127
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 8 January 2026.
Tue 10/27:54 p.m.SEA - DEN
Nonstop2h 41mHawaiian Airlines
Deal found 8/1C$ 61
Tue 10/28:55 a.m.SEA - DEN
Nonstop2h 43mAlaska Airlines
Deal found 7/1C$ 64
Sat 7/37:40 p.m.SEA - DEN
Nonstop2h 45mDelta
Deal found 6/1C$ 68
Thu 5/37:50 a.m.SEA - DEN
1 stop5h 15mSouthwest
Deal found 7/1C$ 70
Tue 10/26:45 a.m.SEA - DEN
1 stop8h 05mSouthwest
Deal found 8/1C$ 77
Sat 31/111:26 a.m.SEA - DEN
1 stop7h 32mDelta
Deal found 7/1C$ 82
Thu 26/29:10 a.m.SEA - DEN
2 stops7h 30mSouthwest
Deal found 7/1C$ 84
Mon 18/55:07 a.m.SEA - DEN
Nonstop2h 43mUnited Airlines
Deal found 8/1C$ 94
Mon 26/111:25 a.m.SEA - DEN
1 stop7h 04mDelta
Deal found 7/1C$ 95
Wed 4/35:15 a.m.SEA - DEN
1 stop5h 20mSouthwest
Deal found 6/1C$ 97
Mon 6/45:00 a.m.SEA - DEN
Nonstop2h 44mUnited Airlines
Deal found 6/1C$ 98
Cheapflights Fare Finder
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 8 January 2026.
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
Thu 19/2
8:14 p.m.-11:59 p.m.
Nonstop2h 45m
Denver Intl
Wed 25/2
12:34 p.m.-2:41 p.m.
Nonstop3h 07m
C$ 126
SeattleDenver
SEA - DEN
SEADEN
Seattle/Tacoma Intl
Wed 11/2
5:00 a.m.-8:48 a.m.
Nonstop2h 48m
Denver Intl
Thu 12/2
8:54 p.m.-10:59 p.m.
Nonstop3h 05m
C$ 126
SeattleDenver
SEA - DEN
SEADEN
Seattle/Tacoma Intl
Sat 7/2
7:54 p.m.-11:35 p.m.
Nonstop2h 41m
Denver Intl
Mon 9/2
7:00 a.m.-9:11 a.m.
Nonstop3h 11m
C$ 130
SeattleDenver
SEA - DEN
SEADEN
Seattle/Tacoma Intl
Tue 21/4
8:30 a.m.-12:12 p.m.
Nonstop2h 42m
Denver Intl
Thu 23/4
6:54 a.m.-9:02 a.m.
Nonstop3h 08m
C$ 134
SeattleDenver
SEA - DEN
SEADEN
Seattle/Tacoma Intl
Fri 30/1
6:05 a.m.-9:40 a.m.
Nonstop2h 35m
Denver Intl
Sun 1/2
8:20 a.m.-10:25 a.m.
Nonstop3h 05m
C$ 134
SeattleDenver
SEA - DEN
SEADEN
Seattle/Tacoma Intl
Sat 31/1
5:00 a.m.-8:48 a.m.
Nonstop2h 48m
Denver Intl
Sat 31/1
7:08 p.m.-9:15 p.m.
Nonstop3h 07m
C$ 134
SeattleDenver
SEA - DEN
SEADEN
Seattle/Tacoma Intl
Tue 7/4
7:45 p.m.-11:31 p.m.
Nonstop2h 46m
Denver Intl
Thu 9/4
6:30 a.m.-8:38 a.m.
Nonstop3h 08m
C$ 134
SeattleDenver
SEA - DEN
SEADEN
Seattle/Tacoma Intl
Mon 23/2
7:40 p.m.-11:25 p.m.
Nonstop2h 45m
Denver Intl
Fri 27/2
6:50 p.m.-9:08 p.m.
Nonstop3h 18m
C$ 134
SeattleDenver
SEA - DEN
SEADEN
Seattle/Tacoma Intl
Wed 1/4
7:45 p.m.-11:31 p.m.
Nonstop2h 46m
Denver Intl
Fri 3/4
6:30 a.m.-8:38 a.m.
Nonstop3h 08m
C$ 134
SeattleDenver
SEA - DEN
SEADEN
Seattle/Tacoma Intl
Thu 19/2
11:30 a.m.-6:40 p.m.
1 stop6h 10m
Denver Intl
Tue 24/2
8:35 a.m.-10:45 a.m.
Nonstop3h 10m
C$ 140
Flights are sorted by cheapest round-trip flights first.
Deals found on 6/1
Showing 1-10 of 22 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 2 January 2026.
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$ 51). 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 8 January 2026.
Unlike in the morning, when flights are generally more expensive, you can save up to 33% 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 3 January 2026.
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 8 January 2026.
The most flights from SEA to DEN are scheduled on a Thursday (34 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (10 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 8 January 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.
I really got a lesson in upgrades. I let my seat get chosen . Both times a middle seat...on purpose ...even when we were not full. That's petty I sat behind the first class . They got more than 1 drink ...and a snack . .and the staff actually talked to them...behind a see thru shawl/sheet in the aisle....... You could see over the seats just fine and you could hear the voices just fine. But the sheet let You KNOW. Your not welcome here. For a moment I regretted not spending 300 dollars per seat so I could see a smile and eat a sandwhich and enjoy my seat . The married couple drank champain and laughed and flirted with each other. It looked so happy and care free MONEY really does buy happiness ..the hateful glares and sighs from my seat mates brought me back to reality I wasn't rich and I still had 2 hours left in this middle seat.
I really got a lesson in upgrades. I let my seat get chosen . Both times a middle seat...on purpose ...even when we were not full. That's petty I sat behind the first class . They got more than 1 drink ...and a snack . .and the staff actually talked to them...behind a see thru shawl/sheet in the aisle....... You could see over the seats just fine and you could hear the voices just fine. But the sheet let You KNOW. Your not welcome here. For a moment I regretted not spending 300 dollars per seat so I could see a smile and eat a sandwhich and enjoy my seat . The married couple drank champain and laughed and flirted with each other. It looked so happy and care free MONEY really does buy happiness ..the hateful glares and sighs from my seat mates brought me back to reality I wasn't rich and I still had 2 hours left in this middle seat.
I really got a lesson in upgrades. I let my seat get chosen . Both times a middle seat...on purpose ...even when we were not full. That's petty I sat behind the first class . They got more than 1 drink ...and a snack . .and the staff actually talked to them...behind a see thru shawl/sheet in the aisle....... You could see over the seats just fine and you could hear the voices just fine. But the sheet let You KNOW. Your not welcome here. For a moment I regretted not spending 300 dollars per seat so I could see a smile and eat a sandwhich and enjoy my seat . The married couple drank champain and laughed and flirted with each other. It looked so happy and care free MONEY really does buy happiness ..the hateful glares and sighs from my seat mates brought me back to reality I wasn't rich and I still had 2 hours left in this middle seat.
I really got a lesson in upgrades. I let my seat get chosen . Both times a middle seat...on purpose ...even when we were not full. That's petty I sat behind the first class . They got more than 1 drink ...and a snack . .and the staff actually talked to them...behind a see thru shawl/sheet in the aisle....... You could see over the seats just fine and you could hear the voices just fine. But the sheet let You KNOW. Your not welcome here. For a moment I regretted not spending 300 dollars per seat so I could see a smile and eat a sandwhich and enjoy my seat . The married couple drank champain and laughed and flirted with each other. It looked so happy and care free MONEY really does buy happiness ..the hateful glares and sighs from my seat mates brought me back to reality I wasn't rich and I still had 2 hours left in this middle seat.
I really got a lesson in upgrades. I let my seat get chosen . Both times a middle seat...on purpose ...even when we were not full. That's petty I sat behind the first class . They got more than 1 drink ...and a snack . .and the staff actually talked to them...behind a see thru shawl/sheet in the aisle....... You could see over the seats just fine and you could hear the voices just fine. But the sheet let You KNOW. Your not welcome here. For a moment I regretted not spending 300 dollars per seat so I could see a smile and eat a sandwhich and enjoy my seat . The married couple drank champain and laughed and flirted with each other. It looked so happy and care free MONEY really does buy happiness ..the hateful glares and sighs from my seat mates brought me back to reality I wasn't rich and I still had 2 hours left in this middle seat.
I really got a lesson in upgrades. I let my seat get chosen . Both times a middle seat...on purpose ...even when we were not full. That's petty I sat behind the first class . They got more than 1 drink ...and a snack . .and the staff actually talked to them...behind a see thru shawl/sheet in the aisle....... You could see over the seats just fine and you could hear the voices just fine. But the sheet let You KNOW. Your not welcome here. For a moment I regretted not spending 300 dollars per seat so I could see a smile and eat a sandwhich and enjoy my seat . The married couple drank champain and laughed and flirted with each other. It looked so happy and care free MONEY really does buy happiness ..the hateful glares and sighs from my seat mates brought me back to reality I wasn't rich and I still had 2 hours left in this middle seat.
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 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 212 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 42m. Fly via Alaska Airlines, United Airlines, 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$ 81), 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: ANA (90%), Copa Airlines (89%), United Airlines( 89%).
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$ 515, our data indicates the cheapest price to be C$ 81. The most popular route (Seattle/Tacoma Intl - Denver Intl), is priced around C$ 127.
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$ 51). 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 8 January 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 8 January 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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