Seattle skyline and Space Needle at sunset with Mount Rainier in the distance

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

  • About 1,022 miles
  • About 2.5 hours
  • Best months: Jun, Jul, Aug
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Seattle is calling, and Denver travelers have plenty of options. Airlines on DEN to SEA include Alaska, Delta, United and Southwest. Expect about 2.5 hours in the air and fares from $201 when you book at the right moment.

Tips for finding a lower fare

  • Try booking a Tuesday or Wednesday departure to Seattle; those days are quieter on most carriers.
  • Use a fare calendar and look at a full month before choosing dates.
  • Compare the total trip cost, including bags and seat fees, not just the base fare to SEA.

Airlines on this route

Alaska, Delta, United, Southwest

Things to see in Seattle

  • Discovery Park
  • Pike Place Market
  • Space Needle

Frequently asked questions

When is the cheapest time to fly from Denver to Seattle?

Fares on DEN to SEA are often lower in Jun, Jul and Aug. Prices move with demand, so compare a few dates on the partner site before you decide.

How long is the flight from DEN to SEA?

A nonstop flight takes about 2.5 hours. Itineraries with a connection take longer, depending on the layover.

Which airlines fly from Denver to Seattle?

Carriers we commonly see on this route include Alaska, Delta, United and Southwest. Schedules and availability change, so check current options when you search.

How far ahead should I book DEN to SEA?

For most domestic trips, booking about 1 to 3 months ahead gives a good balance of price and choice. Holiday travel is better booked earlier.

Is the price I see here the final price?

No. Fares shown on this page are indicative and change often. The final price, taxes and fees are shown on the partner site at booking.

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