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Flights from Seattle to Denver

Hi, I've summed up all the key info for Seattle to Denver flights

Cheapest one-way

$ 24
Frontier Airlines Sat, Oct 31

86% below next 30d avg. ($168)

Cheapest round-trip

$ 48
Frontier Airlines Sat, Oct 24

81% below next 30d avg. ($253)

When to travel

November Cheapest month
July Peak month

Fastest flight

2h 48m Avg: 2h 46m

Recommended airlines

With a lowest one-way fare of $24 , travelers can expect an average price of $168 for upcoming trips, while round-trip tickets start at $48 . Flights typically take around 2h 46m , but the fastest nonstop option completes the journey in just 2h 48m minutes. There are 58 flights weekly on this route. You can arrive at any of the following airports in Denver: Denver International Airport (DEN) , and Rocky Mountain Metropolitan Airport (BJC) . Flights from Seattle-Tacoma International Airport to Denver International Airport (SEA-DEN) are by far the most popular option for this route. To secure the best rates, booking 40 days in advance is recommended, and the cheapest travel days are Tuesday, Wednesday, and Saturday .

Updated 3d ago · This content is an AI-powered summary based on Trip.com data. Prices and availability are subject to change. Please refer to actual prices, availability, and travel conditions.

Explore the cheapest one-way and round-trip flights from Seattle to Denver over the next 90 days, with one-way fares from $24 and round-trip from $48. Based on Trip.com's latest 7-day flight data.

      • Cheapest nonstop
        SEA 4:27 PM
        2h 50m
        Nonstop
        DEN 8:17 PM
        Seattle - Denver | Sat, Oct 24 | Frontier Airlines
        DEN 1:04 PM
        3h 8m
        Nonstop
        SEA 3:12 PM
        Denver - Seattle | Sat, Oct 31 | Frontier Airlines
        $48 $85
        44% off
        44% off
        $85 $48
      • SEA 4:27 PM
        2h 54m
        Nonstop
        DEN 8:21 PM
        Seattle - Denver | Wed, Sep 23 | Frontier Airlines
        DEN 1:07 PM
        3h 1m
        Nonstop
        SEA 3:08 PM
        Denver - Seattle | Tue, Sep 29 | Frontier Airlines
        $62 $85
        27% off
        27% off
        $85 $62
      • SEA 4:27 PM
        2h 54m
        Nonstop
        DEN 8:21 PM
        Seattle - Denver | Wed, Sep 30 | Frontier Airlines
        DEN 1:07 PM
        3h 1m
        Nonstop
        SEA 3:08 PM
        Denver - Seattle | Wed, Oct 7 | Frontier Airlines
        $62 $85
        27% off
        27% off
        $85 $62
      • SEA 7:41 PM
        2h 53m
        Nonstop
        DEN 11:34 PM
        Seattle - Denver | Sat, Oct 31 | Frontier Airlines
        DEN 7:45 AM
        3h 6m
        Nonstop
        SEA 9:51 AM
        Denver - Seattle | Sat, Nov 7 | Frontier Airlines
        $63
        26% off
        $85 $63
      • SEA 7:41 PM
        2h 53m
        Nonstop
        DEN 11:34 PM
        Seattle - Denver | Wed, Oct 28 | Frontier Airlines
        DEN 7:45 AM
        3h 6m
        Nonstop
        SEA 9:51 AM
        Denver - Seattle | Tue, Nov 3 | Frontier Airlines
        $63
        26% off
        $85 $63
      • SEA 7:41 PM
        2h 53m
        Nonstop
        DEN 11:34 PM
        Seattle - Denver | Tue, Nov 3 | Frontier Airlines
        DEN 7:45 AM
        3h 6m
        Nonstop
        SEA 9:51 AM
        Denver - Seattle | Tue, Nov 10 | Frontier Airlines
        $63
        26% off
        $85 $63
      • SEA 7:41 PM
        2h 53m
        Nonstop
        DEN 11:34 PM
        Seattle - Denver | Tue, Oct 20 | Frontier Airlines
        DEN 7:45 AM
        3h 6m
        Nonstop
        SEA 9:51 AM
        Denver - Seattle | Tue, Oct 27 | Frontier Airlines
        $64
        25% off
        $85 $64
      • SEA 7:41 PM
        2h 53m
        Nonstop
        DEN 11:34 PM
        Seattle - Denver | Thu, Oct 29 | Frontier Airlines
        DEN 7:45 AM
        3h 6m
        Nonstop
        SEA 9:51 AM
        Denver - Seattle | Wed, Nov 4 | Frontier Airlines
        $79
        7% off
        $85 $79
      • SEA 7:41 PM
        2h 53m
        Nonstop
        DEN 11:34 PM
        Seattle - Denver | Thu, Nov 5 | Frontier Airlines
        DEN 7:45 AM
        3h 6m
        Nonstop
        SEA 9:51 AM
        Denver - Seattle | Tue, Nov 10 | Frontier Airlines
        $79
        7% off
        $85 $79
      • SEA 7:41 PM
        2h 53m
        Nonstop
        DEN 11:34 PM
        Seattle - Denver | Sat, Nov 7 | Frontier Airlines
        DEN 7:45 AM
        3h 6m
        Nonstop
        SEA 9:51 AM
        Denver - Seattle | Thu, Nov 12 | Frontier Airlines
        $79
        7% off
        $85 $79
      • SEA 1:00 PM
        17h 25m
        1 stop
        DEN 2:00 PM
        Seattle - Denver | Mon, Sep 14 | Normal Airline
        DEN 3:00 PM
        6h
        Nonstop
        SEA 4:00 PM
        Denver - Seattle | Wed, Sep 16 | Normal Airline
        Find more flights
        Find more flights
      • Cheapest nonstop
        SEA 4:27 PM
        2h 48m
        Nonstop
        DEN 8:15 PM
        Seattle - Denver | Sat, Oct 31 | Frontier Airlines
        $24 $74
        68% off
        68% off
        $74 $24
      • SEA 4:27 PM
        2h 48m
        Nonstop
        DEN 8:15 PM
        Seattle - Denver | Sat, Nov 7 | Frontier Airlines
        $24 $74
        68% off
        68% off
        $74 $24
      • SEA 4:27 PM
        2h 48m
        Nonstop
        DEN 8:15 PM
        Seattle - Denver | Mon, Nov 2 | Frontier Airlines
        $25 $74
        66% off
        66% off
        $74 $25
      • SEA 4:27 PM
        2h 50m
        Nonstop
        DEN 8:17 PM
        Seattle - Denver | Mon, Oct 19 | Frontier Airlines
        $25
        66% off
        $74 $25
      • SEA 4:27 PM
        2h 50m
        Nonstop
        DEN 8:17 PM
        Seattle - Denver | Thu, Oct 22 | Frontier Airlines
        $34
        54% off
        $74 $34
      • SEA 4:27 PM
        2h 48m
        Nonstop
        DEN 8:15 PM
        Seattle - Denver | Mon, Nov 9 | Frontier Airlines
        $45
        39% off
        $74 $45
      • SEA 7:41 PM
        2h 53m
        Nonstop
        DEN 11:34 PM
        Seattle - Denver | Wed, Oct 21 | Frontier Airlines
        $46
        38% off
        $74 $46
      • SEA 4:27 PM
        2h 50m
        Nonstop
        DEN 8:17 PM
        Seattle - Denver | Fri, Oct 16 | Frontier Airlines
        $59
        20% off
        $74 $59
      • SEA 4:27 PM
        2h 50m
        Nonstop
        DEN 8:17 PM
        Seattle - Denver | Sat, Oct 17 | Frontier Airlines
        $59
        20% off
        $74 $59
      • SEA 7:41 PM
        2h 53m
        Nonstop
        DEN 11:34 PM
        Seattle - Denver | Tue, Oct 13 | Frontier Airlines
        $68
        8% off
        $74 $68
      • SEA 1:00 PM
        17h 25m
        1 stop
        DEN 2:00 PM
        Seattle - Denver | Mon, Sep 14 | Normal Airline
        Find more flights
        Find more flights

Flight.News
Flights from Seattle to Denver operate an average of 42 times per day over the past 7 days, with a 26.7% on-time departure rate and a 85.5% on-time arrival rate.

Which airlines are the most popular for Seattle to Denver flights?

The most popular airlines flying from Seattle to Denver are Frontier Airlines, Alaska Airlines, and Delta Air Lines, among 4 carriers on this route. Frontier Airlines offers the lowest fares. Based on Trip.com's flight booking data from the previous 12 months.
Frontier Airlines logo Frontier Airlines
Alaska Airlines logo Alaska Airlines
Delta Air Lines logo Delta Air Lines
United Airlines logo United Airlines
Airlines are determined based on actual purchased flight tickets from Seattle to Denver according to previous 12 months data from Trip.com.

Flight Info | Seattle to Denver

The distance between Seattle and Denver is approximately 1,644.78 km. It takes around 2 hours 46 minutes on average to fly from Seattle to Denver. Based on Trip.com's data travel demand peaks in July. The off-season for travel is November.

Cheapest one-way flight price $24
Cheapest round-trip ticket price $48
Off-season for travel November
Peak season for travel July
Flight distance 1,644.78 km
Average flight time 2 hours 46 minutes
Popular airline Frontier Airlines
Frequency ～80/week
Flight statistics for the Seattle–Denver route are based on aggregated booking data from Trip.com over the past 12 months.

Trip.com price insights on flights from Seattle to Denver

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

The average price of one-way flights from Seattle 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 Seattle to Denver is January, with an average price of $113; while the month with the highest flight price is usually June, with an average price of up to $209.

$209
$161
$113
$65
    Cheapest
  • $150
    Sep
  • $121
    Oct
  • $155
    Nov
  • $144
    Dec
  • $113
    Jan
  • $156
    Feb
  • $146
    Mar
  • $165
    Apr
  • $142
    May
  • $209
    Jun
  • $202
    Jul
  • $184
    Aug

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

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

Columbus Day is scheduled for Oct 12. The cheapest flights from Seattle to Denver are available on Oct 9, with fares starting at $60.

$118
$89
$60
$31
  • $60
    9
    Oct
  • $82
    10
  • $118
    11
  • $98
    12
  • $102
    13
  • $105
    14

Frequently Asked Questions

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

    Based on Trip.com data, Frontier Airlines offers one-way fares as low as $24 on Cheapest nonstop routes (e.g. SEA to DEN on Sat, Oct 31), while Frontier Airlines offers Cheapest nonstop round-trips from $48 departing on Sat, Oct 24 and returning on Sat, Oct 31.
  • At the moment, you can catch a nonstop flight from Seattle to Denver with the following airlines, including: Frontier Airlines Alaska Airlines Delta Air Lines 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 46 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 58 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 -- AS682 (07:36) Delta Air Lines: S/M/T/W/T/F/S -- DL1358 (09:19) United Airlines: S/M/T/W/T/F/S -- UA2601 (05:07)
  • 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, Oct 31, with one-way flights priced at just $24.
    · 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 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 September flight calendar, it's currently cheapest to fly from Seattle to Denver on September 23, 2026 with Frontier Airlines, with prices starting at $53.
  • You can arrive at any of the following airports in Denver: Denver International Airport (DEN), and Rocky Mountain Metropolitan Airport (BJC). Flights from Seattle-Tacoma International Airport to Denver International Airport (SEA-DEN) are by far the most popular option for this route.
  • 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.
  • Based on Trip.com data for flights departing in the next 30 days, the average one-way fare from Seattle to Denver is $168. 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 Seattle to Denver is $253. The final price depends on the outbound and return dates, airline and fare conditions.
  • Enter Seattle and Denver, 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 Seattle to Denver. Check baggage, seat and payment fees before comparing the final price.

Explore More Popular Flights

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.