Cheap Flights from Seattle (SEA) to Denver (DEN)

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 US$40 on Cheapest nonstop routes (e.g. SEA to DEN on Sun, May 3), while Frontier Airlines offers Cheapest nonstop round-trips from US$58 departing on Tue, Apr 21 and returning on Mon, Apr 27.

• Which airlines offer direct flights from Seattle to Denver?

  At the moment, you can catch a nonstop flight from Seattle to Denver with the following airlines, including: Alaska Airlines United Airlines Selected airlines are based on historical data collected from flight bookings users made on Trip.com within the last 90 days.

• How long is a flight from Seattle to Denver?

  It takes about 2 hours 47 minutes to fly from Seattle to Denver.

• When is the best time to book flights from Seattle to Denver?

  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.

• How many flights are there per week from Seattle to Denver?

  Based on Trip.com data in the past 4 weeks, there is 46 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 (07:23) United Airlines: S/M/T/W/T/F/S -- UA1505 (09:05)

• How can I find the best deals on flights from Seattle to Denver?

  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 Sun, May 3, with one-way flights priced at just US$40.
  · 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.

• When are flight tickets from Seattle (SEA) to Denver (DEN) the cheapest?

  The cheapest months to fly from Seattle to Denver is November, when demand for travel is lower.

• Which upcoming date is cheapest to fly from Seattle to Denver on?

  After crunching the numbers on our April flight calendar, it's currently cheapest to fly from Seattle to Denver on April 16, 2026 with Frontier Airlines, with prices starting at US$21.

• Which airports can I fly to for Denver from Seattle?

  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: Rocky Mountain Metropolitan Airport (BJC) Denver International Airport (DEN).

• Is there any time difference between Seattle and Denver?

  The time difference between Denver and Seattle is 1h.

• How do I change or cancel my ticket from Seattle to Denver?

  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.