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Flights from Denver to Seattle

Flight Info | Denver to Seattle

The distance between Denver and Seattle is approximately 1,644.78 km. It takes around 3 hours 2 minutes on average to fly from Denver to Seattle. Based on Trip.com's data, travel demand peaks in July. The cheapest month to book is October.

Cheapest one-way
$46
Frontier Airlines Frontier Airlines DEN-SEA 3h 17m · Nonstop Tue, Aug 25
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Cheapest round-trip
$80
Frontier Airlines Frontier Airlines DEN-SEA 3h 4m · Nonstop Wed, Aug 26 - Fri, Aug 28
Select flight
Recommended airlines
Frontier Airlines Frontier Airlines Cheapest · From $46 Frontier Airlines Frontier Airlines Most booked
When to travel
April
Cheapest
July
Peak season for travel
Route details
1,644.78 km
Flight distance
3h 2m
Average flight time

Book direct flights from Denver to Seattle: One way flights from $46, round trip flights from $80. Find flight deals for the next 3 months below.

      • Cheapest nonstop
        DEN 7:15 AM
        3h 4m
        Nonstop
        SEA 9:19 AM
        Denver - Seattle | Wed, Aug 26 | Frontier Airlines
        SEA 7:06 PM
        2h 52m
        Nonstop
        DEN 10:58 PM
        Seattle - Denver | Fri, Aug 28 | Frontier Airlines
        $80 $141
        43% off
        43% off
        $141 $80
      • DEN 7:15 AM
        3h 4m
        Nonstop
        SEA 9:19 AM
        Denver - Seattle | Sun, Aug 23 | Frontier Airlines
        SEA 7:06 PM
        2h 52m
        Nonstop
        DEN 10:58 PM
        Seattle - Denver | Sat, Aug 29 | Frontier Airlines
        $89 $141
        37% off
        37% off
        $141 $89
      • DEN 7:15 AM
        3h 4m
        Nonstop
        SEA 9:19 AM
        Denver - Seattle | Mon, Aug 24 | Frontier Airlines
        SEA 7:06 PM
        2h 52m
        Nonstop
        DEN 10:58 PM
        Seattle - Denver | Wed, Aug 26 | Frontier Airlines
        $89 $141
        37% off
        37% off
        $141 $89
      • DEN 7:15 AM
        3h 4m
        Nonstop
        SEA 9:19 AM
        Denver - Seattle | Wed, Aug 19 | Frontier Airlines
        SEA 2:37 PM
        2h 56m
        Nonstop
        DEN 6:33 PM
        Seattle - Denver | Tue, Aug 25 | Frontier Airlines
        $89
        37% off
        $141 $89
      • DEN 10:29 PM
        2h 58m
        Nonstop
        SEA 12:27 AM
        Denver - Seattle | Fri, Oct 2 | Frontier Airlines
        SEA 7:00 AM
        2h 51m
        Nonstop
        DEN 10:51 AM
        Seattle - Denver | Sun, Oct 4 | Frontier Airlines
        $93
        34% off
        $141 $93
      • DEN 7:15 AM
        3h 4m
        Nonstop
        SEA 9:19 AM
        Denver - Seattle | Wed, Sep 2 | Frontier Airlines
        SEA 2:37 PM
        2h 56m
        Nonstop
        DEN 6:33 PM
        Seattle - Denver | Sat, Sep 5 | Frontier Airlines
        $95
        33% off
        $141 $95
      • DEN 7:00 AM
        3h 4m
        Nonstop
        SEA 9:04 AM
        Denver - Seattle | Fri, Aug 14 | Frontier Airlines
        SEA 7:06 PM
        2h 52m
        Nonstop
        DEN 10:58 PM
        Seattle - Denver | Tue, Aug 18 | Frontier Airlines
        $115
        18% off
        $141 $115
      • DEN 7:15 AM
        3h 4m
        Nonstop
        SEA 9:19 AM
        Denver - Seattle | Fri, Aug 21 | Frontier Airlines
        SEA 7:06 PM
        2h 52m
        Nonstop
        DEN 10:58 PM
        Seattle - Denver | Tue, Aug 25 | Frontier Airlines
        $115
        18% off
        $141 $115
      • DEN 7:15 AM
        3h 4m
        Nonstop
        SEA 9:19 AM
        Denver - Seattle | Fri, Aug 28 | Frontier Airlines
        SEA 7:06 PM
        2h 52m
        Nonstop
        DEN 10:58 PM
        Seattle - Denver | Sun, Aug 30 | Frontier Airlines
        $117
        17% off
        $141 $117
      • DEN 7:15 AM
        3h 4m
        Nonstop
        SEA 9:19 AM
        Denver - Seattle | Sat, Aug 22 | Frontier Airlines
        SEA 1:35 PM
        2h 59m
        Nonstop
        DEN 5:34 PM
        Seattle - Denver | Mon, Aug 24 | Frontier Airlines
        $122
        13% off
        $141 $122
      • DEN 1:00 PM
        17h 25m
        1 stop
        SEA 2:00 PM
        Denver - Seattle | Wed, Aug 12 | Normal Airline
        SEA 3:00 PM
        6h
        Nonstop
        DEN 4:00 PM
        Seattle - Denver | Fri, Aug 14 | Normal Airline
        Find more flights
        Find more flights
      • Cheapest nonstop
        DEN 11:05 AM
        3h 17m
        Nonstop
        SEA 1:22 PM
        Denver - Seattle | Tue, Aug 25 | Frontier Airlines
        $46 $87
        47% off
        47% off
        $87 $46
      • DEN 1:07 PM
        3h 1m
        Nonstop
        SEA 3:08 PM
        Denver - Seattle | Mon, Sep 14 | Frontier Airlines
        $65 $87
        25% off
        25% off
        $87 $65
      • DEN 1:07 PM
        3h 1m
        Nonstop
        SEA 3:08 PM
        Denver - Seattle | Tue, Sep 15 | Frontier Airlines
        $65 $87
        25% off
        25% off
        $87 $65
      • DEN 1:07 PM
        3h 1m
        Nonstop
        SEA 3:08 PM
        Denver - Seattle | Tue, Sep 22 | Frontier Airlines
        $66
        24% off
        $87 $66
      • DEN 7:15 AM
        3h 4m
        Nonstop
        SEA 9:19 AM
        Denver - Seattle | Wed, Sep 2 | Frontier Airlines
        $70
        20% off
        $87 $70
      • DEN 1:07 PM
        3h 1m
        Nonstop
        SEA 3:08 PM
        Denver - Seattle | Wed, Sep 23 | Frontier Airlines
        $70
        20% off
        $87 $70
      • DEN 7:15 AM
        3h 4m
        Nonstop
        SEA 9:19 AM
        Denver - Seattle | Sun, Aug 30 | Frontier Airlines
        $71
        18% off
        $87 $71
      • DEN 1:07 PM
        3h 1m
        Nonstop
        SEA 3:08 PM
        Denver - Seattle | Wed, Sep 9 | Frontier Airlines
        $71
        18% off
        $87 $71
      • DEN 1:07 PM
        3h 1m
        Nonstop
        SEA 3:08 PM
        Denver - Seattle | Sat, Sep 26 | Frontier Airlines
        $71
        18% off
        $87 $71
      • DEN 11:05 AM
        3h 17m
        Nonstop
        SEA 1:22 PM
        Denver - Seattle | Tue, Sep 1 | Frontier Airlines
        $75
        14% off
        $87 $75
      • DEN 1:00 PM
        17h 25m
        1 stop
        SEA 2:00 PM
        Denver - Seattle | Wed, Aug 12 | Normal Airline
        Find more flights
        Find more flights

Popular airlines from Denver to Seattle

You can choose from 4 airlines that fly from Denver to Seattle, including Frontier Airlines, United Airlines, and Alaska Airlines. Frontier Airlines has lowest fares on this route.
Frontier Airlines logo Frontier Airlines
United Airlines logo United Airlines
Alaska Airlines logo Alaska Airlines
Delta Air Lines logo Delta Air Lines
Airlines are determined based on actual purchased flight tickets from Denver to Seattle according to previous 12 months data from Trip.com.

Trip.com price insights on flights from Denver to Seattle

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

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

Based on Trip.com’s data, the cheapest month for flights from Denver to Seattle is April, with an average price of $120; while the month with the highest flight price is usually June, with an average price of up to $189.

$189
$155
$120
$86
    Cheapest
  • $127
    Aug
  • $158
    Sep
  • $136
    Oct
  • $132
    Nov
  • $148
    Dec
  • $134
    Jan
  • $142
    Feb
  • $148
    Mar
  • $120
    Apr
  • $159
    May
  • $189
    Jun
  • $176
    Jul

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

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

Labor Day is scheduled for Sep 7. The cheapest flights from Denver to Seattle are available on Sep 5, with fares starting at $68.

$150
$109
$68
$27
    Cheapest
  • $150
    3
    Sep
  • $120
    4
  • $68
    5
  • $97
    6
  • $93
    7
  • $146
    8
  • $82
    9

Frequently Asked Questions

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

    Based on Trip.com data, Frontier Airlines offers one-way fares as low as $46 on Cheapest nonstop routes (e.g. DEN to SEA on Tue, Aug 25), while Frontier Airlines offers Cheapest nonstop round-trips from $80 departing on Wed, Aug 26 and returning on Fri, Aug 28.
  • At the moment, you can catch a nonstop flight from Denver to Seattle with the following airlines, including: Frontier Airlines Alaska Airlines United Airlines Delta Air Lines Selected airlines are based on historical data collected from flight bookings users made on Trip.com within the last 90 days.
  • It takes around 3 hours 2 minutes to fly from Denver (DEN) to Seattle (SEA).
  • By analyzing data from all airlines on the Trip.com flight calendar, it looks like the best time to book a flight from Denver to Seattle 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 97 flight per week flying from Denver to Seattle. You can check the weekly schedule for popular airlines on this route below: Alaska Airlines: S/M/T/W/T/F/S -- AS643 (06:13) United Airlines: S/M/T/W/T/F/S -- UA2271 (08:16)
  • To find best deals on flights from Denver to Seattle, 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 Tue, Aug 25, with one-way flights priced at just $46.
    · Compare airlines strategically. Budget carriers often provide the lowest base fares, while we found the most affordable airline currently operating on this route is Frontier Airlines.
    · 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 Seattle travel is around July.
    · Get exclusive promo codes for Trip.com app users.
  • The cheapest months to fly from Denver to Seattle is October, when demand for travel is lower.
  • After crunching the numbers on our August flight calendar, it's currently cheapest to fly from Denver to Seattle on August 26, 2026 with Frontier Airlines, with prices starting at $55.
  • You can land at any one of the following hubs in Seattle, with Denver International Airport to Seattle-Tacoma International Airport (DEN-SEA) is by far the most common option on this route: Seattle-Tacoma International Airport (SEA) King County (Boeing Field) International Airport (BFI) Kenmore Air Harbor Seaplane Base (LKE).
  • The time difference between Seattle and Denver 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.
  • Based on Trip.com data for flights departing in the next 30 days, the average one-way fare from Denver to Seattle is $149. Fares vary by travel date, airline and availability.
  • Based on Trip.com data for travel in the next 30 days, the average round-trip fare from Denver to Seattle is $254. The final price depends on the outbound and return dates, airline and fare conditions.
  • Enter Denver and Seattle, choose your travel dates and passengers, then compare flights by price, duration and baggage. Select a fare, review the change and cancellation rules, enter traveler details and complete payment to receive your confirmation.
  • Frontier Airlinesare the most popular budget airlines flying from Denver to Seattle. Check baggage, seat and payment fees before comparing the final price.

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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.

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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.