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Flights from Seattle to Denver

Book direct flights from Seattle to Denver: One way flights from $41, round trip flights from $100. Find flight deals for the next 3 months below.

      • Cheapest nonstop
        SEA 7:50 PM
        3h 4m
        Nonstop
        DEN 11:54 PM
        Seattle - Denver | Thu, Jun 4 | Frontier Airlines
        DEN 7:45 AM
        3h 3m
        Nonstop
        SEA 9:48 AM
        Denver - Seattle | Tue, Jun 9 | Frontier Airlines
        $100 $185
        46% off
        46% off
        $185 $100
      • SEA 7:50 PM
        3h 4m
        Nonstop
        DEN 11:54 PM
        Seattle - Denver | Fri, Jun 5 | Frontier Airlines
        DEN 7:45 AM
        3h 3m
        Nonstop
        SEA 9:48 AM
        Denver - Seattle | Tue, Jun 9 | Frontier Airlines
        $100 $185
        46% off
        46% off
        $185 $100
      • SEA 7:50 PM
        3h 4m
        Nonstop
        DEN 11:54 PM
        Seattle - Denver | Thu, May 28 | Frontier Airlines
        DEN 8:00 AM
        3h 6m
        Nonstop
        SEA 10:06 AM
        Denver - Seattle | Tue, Jun 2 | Frontier Airlines
        $100 $185
        46% off
        46% off
        $185 $100
      • SEA 7:50 PM
        3h 4m
        Nonstop
        DEN 11:54 PM
        Seattle - Denver | Fri, May 29 | Frontier Airlines
        DEN 8:00 AM
        3h 6m
        Nonstop
        SEA 10:06 AM
        Denver - Seattle | Sun, May 31 | Frontier Airlines
        $101
        45% off
        $185 $101
      • SEA 7:50 PM
        3h 4m
        Nonstop
        DEN 11:54 PM
        Seattle - Denver | Wed, Jun 3 | Frontier Airlines
        DEN 7:45 AM
        3h 3m
        Nonstop
        SEA 9:48 AM
        Denver - Seattle | Wed, Jun 10 | Frontier Airlines
        $129
        30% off
        $185 $129
      • SEA 7:41 PM
        2h 55m
        Nonstop
        DEN 11:36 PM
        Seattle - Denver | Tue, Jun 9 | Frontier Airlines
        DEN 12:14 PM
        3h 4m
        Nonstop
        SEA 2:18 PM
        Denver - Seattle | Sat, Jun 13 | Frontier Airlines
        $129
        30% off
        $185 $129
      • SEA 7:59 PM
        2h 53m
        Nonstop
        DEN 11:52 PM
        Seattle - Denver | Fri, May 29 | Delta Air Lines
        DEN 8:00 AM
        3h 6m
        Nonstop
        SEA 10:06 AM
        Denver - Seattle | Sun, May 31 | Frontier Airlines
        $132
        28% off
        $185 $132
      • SEA 7:50 PM
        3h 4m
        Nonstop
        DEN 11:54 PM
        Seattle - Denver | Tue, Jun 2 | Frontier Airlines
        DEN 6:00 AM
        3h 5m
        Nonstop
        SEA 8:05 AM
        Denver - Seattle | Tue, Jun 9 | Alaska Airlines
        $151
        18% off
        $185 $151
      • SEA 7:50 PM
        3h 4m
        Nonstop
        DEN 11:54 PM
        Seattle - Denver | Wed, May 20 | Frontier Airlines
        DEN 7:21 PM
        3h 8m
        Nonstop
        SEA 9:29 PM
        Denver - Seattle | Sat, May 23 | Alaska Airlines
        $151
        18% off
        $185 $151
      • SEA 7:50 PM
        3h 4m
        Nonstop
        DEN 11:54 PM
        Seattle - Denver | Tue, May 26 | Frontier Airlines
        DEN 10:39 PM
        20h 56m
        1 stop
        SEA 6:35 PM
        Denver - Seattle | Tue, Jun 2 | Frontier Airlines
        $151
        18% off
        $185 $151
      • SEA 1:00 PM
        17h 25m
        1 stop
        DEN 2:00 PM
        Seattle - Denver | Sun, May 17 | Normal Airline
        DEN 3:00 PM
        6h
        Nonstop
        SEA 4:00 PM
        Denver - Seattle | Tue, May 19 | Normal Airline
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      • Cheapest nonstop
        SEA 7:59 PM
        2h 53m
        Nonstop
        DEN 11:52 PM
        Seattle - Denver | Sat, May 16 | Delta Air Lines
        $41 $85
        52% off
        52% off
        $85 $41
      • SEA 7:50 PM
        3h 4m
        Nonstop
        DEN 11:54 PM
        Seattle - Denver | Wed, Jun 3 | Frontier Airlines
        $44 $85
        48% off
        48% off
        $85 $44
      • SEA 7:50 PM
        3h 4m
        Nonstop
        DEN 11:54 PM
        Seattle - Denver | Tue, Jun 2 | Frontier Airlines
        $45 $85
        47% off
        47% off
        $85 $45
      • SEA 5:45 AM
        2h 40m
        Nonstop
        DEN 9:25 AM
        Seattle - Denver | Sat, May 16 | Hahn Air
        $49
        42% off
        $85 $49
      • SEA 7:59 PM
        2h 53m
        Nonstop
        DEN 11:52 PM
        Seattle - Denver | Sun, May 17 | Delta Air Lines
        $51
        40% off
        $85 $51
      • SEA 7:50 PM
        3h 4m
        Nonstop
        DEN 11:54 PM
        Seattle - Denver | Mon, Jun 8 | Frontier Airlines
        $54
        36% off
        $85 $54
      • SEA 7:50 PM
        3h 4m
        Nonstop
        DEN 11:54 PM
        Seattle - Denver | Thu, Jun 4 | Frontier Airlines
        $55
        35% off
        $85 $55
      • SEA 7:50 PM
        3h 4m
        Nonstop
        DEN 11:54 PM
        Seattle - Denver | Fri, Jun 5 | Frontier Airlines
        $55
        35% off
        $85 $55
      • SEA 5:35 AM
        2h 35m
        Nonstop
        DEN 9:10 AM
        Seattle - Denver | Sun, May 17 | Hahn Air
        $60
        28% off
        $85 $60
      • SEA 7:41 PM
        2h 55m
        Nonstop
        DEN 11:36 PM
        Seattle - Denver | Tue, Jun 30 | Frontier Airlines
        $69
        19% off
        $85 $69
      • SEA 1:00 PM
        17h 25m
        1 stop
        DEN 2:00 PM
        Seattle - Denver | Sun, May 17 | Normal Airline
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Displayed flight fares from Seattle to Denver are based on average prices across airlines for the next 3 months, according to the latest Trip.com database.

Trip.com price insights on flights from Seattle to Denver

Which month has the cheapest one-way flights from to Denver?

The average price of one-way flights from to Denver purchased by Trip.com users by month over the past 12 months.

Based on Trip.com’s data, the cheapest month for flights from to Denver is January, with an average price of $112; while the month with the highest flight price is usually July, with an average price of up to $166.

$166
$139
$112
$85
    Cheapest
  • $130
    May
  • $162
    Jun
  • $166
    Jul
  • $140
    Aug
  • $145
    Sep
  • $120
    Oct
  • $153
    Nov
  • $142
    Dec
  • $112
    Jan
  • $154
    Feb
  • $144
    Mar
  • $163
    Apr

When is the cheapest day to fly from Seattle to Denver during Memorial Day?

Data is based on the lowest one-way price from Seattle to Denver during Memorial Day on Trip.com in the past 3 days.

Memorial Day is scheduled for May 25. The cheapest flights from Seattle to Denver are available on May 26, with fares starting at $95.

$148
$122
$95
$69
    Cheapest
  • $148
    22
    May
  • $116
    23
  • $121
    24
  • $103
    25
  • $95
    26
  • $95
    27

Frequently Asked Questions

  • What are the cheapest flights from Seattle to Denver (SEA-DEN)?

    Based on Trip.com data, Delta Air Lines offers one-way fares as low as $41 on Cheapest nonstop routes (e.g. SEA to DEN on Sat, May 16), while Frontier Airlines offers Cheapest nonstop round-trips from $100 departing on Thu, Jun 4 and returning on Tue, Jun 9.
  • At the moment, you can catch a nonstop flight from Seattle to Denver with the following airlines, including: Alaska Airlines Delta Air Lines Frontier Airlines Hawaiian Airlines United Airlines Selected airlines are based on historical data collected from flight bookings users made on Trip.com within the last 90 days.
  • It takes around 2 hours 50 minutes to fly from Seattle (SEA) to Denver (DEN).
  • By analyzing data from all airlines on the Trip.com flight calendar, it looks like the best time to book a flight from Seattle to Denver is around 40 days (6 weeks) in advance, and the best time to fly is usually on Tuesday, Wednesday, and Saturday. Tuesday typically offers the cheapest flights for departure, while Saturday offers the best return deals.
  • Based on Trip.com data in the past 4 weeks, there is 38 flight per week flying from Seattle to Denver. You can check the weekly schedule for popular airlines on this route below: Alaska Airlines: S/M/T/W/T/F/S -- AS1332 (12:35) Delta Air Lines: S/M/T/W/T/F/S -- DL1358 (08:12) United Airlines: S/M/T/-/T/F/S -- UA2601 (05:35)
  • To find best deals on flights from Seattle to Denver, you can use various tools on Trip.com:
    · Be flexible with your travel dates to get the cheapest flight deal. Now the cheapest flight deal is on Sat, May 16, with one-way flights priced at just $41.
    · Compare airlines strategically. Budget carriers often provide the lowest base fares, while we found the most affordable airline currently operating on this route is Delta Air Lines.
    · Set up price alerts to easily monitor ticket prices without having to check every day.
    · Check Trip.com flight deals and promo codes frequently.
    · Avoid peak season unless you book very early. It seems the peak season for Denver travel is around July.
    · Get exclusive promo codes for Trip.com app users.
  • The cheapest months to fly from Seattle to Denver is November, when demand for travel is lower.
  • After crunching the numbers on our May flight calendar, it's currently cheapest to fly from Seattle to Denver on May 15, 2026 with Frontier Airlines, with prices starting at $70.
  • You can land at any one of the following hubs in Denver, with Seattle-Tacoma International Airport to Denver International Airport (SEA-DEN) is by far the most common option on this route: Denver International Airport (DEN) Rocky Mountain Metropolitan Airport (BJC).
  • The time difference between Denver and Seattle is 1h.
  • Tickets can only be changed or canceled if permitted by airline policy. To submit a change or cancellation request, go to the flight bookings page, select the option to change or cancel your booking, choose the relevant passengers and segment, and submit a request. Please note that additional charges may apply according to the airline ticket policy. However, if the flight has been rescheduled and you would like to change or cancel your ticket, you can submit an involuntary cancellation request. For more details about change and cancellation policies, please check the customer support pages.

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Note: Prices shown on this page are estimated lowest price and include all taxes and fees found in the last 24 hours.

Book with no extra fees

Prices displayed in this page are all-inclusive prices (incl. taxes, fuel surcharge, civil aviation development fund, etc) with all fees confirmed before payment. Fees for luggage, meals, WLAN, or other additional services are also included as shown in the flight cards.

Real-time pricing updates

Prices, availability, and travel information on this page were updated within last 24 hours—even in real-time. The more popular the route, the more precise the data.

Change & Cancellation Policy

Trip.com displays flight cancellation and change policies for each flight ticket during the booking process, including fees and applicable conditions. Please check the following scenarios:
Voluntary cancellation/change:
To submit a change or cancellation request, go to the flight bookings page, select the option to change or cancel your booking, choose the relevant passengers and segment, and submit a request. Please note that additional charges may apply according to the airline ticket policy.
Cancellation/change due to a flight schedule change:
If the flight has been rescheduled and you would like to change or cancel your ticket, you can submit an involuntary cancellation request. For more details about change and cancellation policies, please check the customer support pages.