Cheap Flights from Denver to Seattle | EazAir
Denver to Seattle flight insights
Average flight time
~2h 48m (estimated)
DEN → SEA
Cheapest month
—
Based on cached fare history
Cheapest cached price
$408
Checking live fares…
Prices shown may not be current. Last checked: Aug 29, 2026.
Planning a trip from Denver to Seattle? The average flight time on this route is ~2h 48m (estimated). The lowest fare we have cached for this route is $408 (last checked Aug 29, 2026).
Route Quick Facts
| Origin | Denver (DEN) |
|---|---|
| Destination | Seattle (SEA) |
| Average Flight Time | — |
| Cheapest Month to Fly | — |
| Current Lowest Fare | $408 |
| Fares Last Checked | Aug 29, 2026 |
Flight deals from Denver to Seattle
Direct flights depart from Denver International Airport and arrive at Seattle-Tacoma International Airport daily. The nonstop journey from Denver to Seattle takes about two hours and forty-five minutes in the air. Covering roughly 1,020 miles, this specific flight path connects Colorado's Rocky Mountain region directly to Washington's Puget Sound. Several major carriers operate nonstop scheduled service between Denver and Seattle. Alaska Airlines and United Airlines maintain multiple daily frequencies from DEN to SEA. Frontier Airlines and Southwest Airlines also provide direct flights on this route, giving Colorado travelers various scheduling choices for their Seattle arrivals. Passenger volume on the Denver to Seattle flight path peaks during July and August. Summer departures from Denver to Seattle command higher fares due to increased seasonal demand from cruise ship passengers. To secure the lowest rates for this specific journey, booking your Denver to Seattle tickets during the quieter shoulder months of October or February is highly recommended.
About Seattle
Popular areas to know in Seattle include Capitol Hill, Ballard, and Fremont.
Mild, wet winters and dry, mild summers — the Pacific Northwest's rainy reputation is strongest from October through April.
Frequently asked questions
How long does a direct flight from Denver to Seattle take?
What is the total flight distance from Denver to Seattle?
Which airlines fly direct from Denver to Seattle?
When is the cheapest time to book flights from Denver to Seattle?
What are the busiest months for traveling from Denver to Seattle?
Which specific airports serve the flight route from Denver to Seattle?
Do airlines charge extra for checked baggage on trips from Denver to Seattle?
How does the time zone difference affect my arrival when flying from Denver to Seattle?
Are morning flights cheaper than evening flights from Denver to Seattle?
Can I bring a small pet in the cabin when flying from Denver to Seattle?
Do winter weather conditions frequently delay flights from Denver to Seattle?
Airline baggage policies
Baggage allowances differ significantly between fare classes (Basic/Light vs. Standard/Flex) and can change over time. Always verify the exact allowance for your specific fare with the airline before you fly.
| Airline | Cabin bag | Checked bag |
|---|---|---|
| Delta Air Lines | 1 carry-on + 1 personal item on most fares | 1 checked bag typically included on Main Cabin and above; Basic Economy usually excludes it |
| American Airlines | 1 carry-on + 1 personal item on most fares | 1 checked bag typically included on Main Cabin and above; Basic Economy usually excludes it |
| United Airlines | 1 carry-on + 1 personal item on most fares | 1 checked bag typically included on Economy and above; Basic Economy usually excludes it |
| Southwest Airlines | 1 carry-on + 1 personal item | 2 checked bags included on every fare — a long-standing, well-known Southwest policy |
| JetBlue Airways | 1 personal item on the cheapest (Blue Basic) fare; a carry-on is added on higher fares | Not included on Blue Basic; typically included from Blue Plus and above |
| Alaska Airlines | 1 carry-on + 1 personal item on most fares | 1 checked bag typically included on Main and above; Saver fares usually exclude it |
| Spirit Airlines | 1 personal item included; a full-sized carry-on is a paid add-on | Not included on the base fare — a paid add-on at every fare tier |
| Frontier Airlines | 1 personal item included; a full-sized carry-on is a paid add-on | Not included on the base fare — a paid add-on at every fare tier |
Travel tips
Arrive early for domestic flights
TSA generally recommends arriving at least 2 hours before a domestic departure, more at larger hub airports during peak travel periods.
Pack a mixed carry-on
Keep a change of clothes, chargers, and any essentials in your carry-on rather than only your checked bag, in case of a delay or a bag that doesn't arrive with you.
Ease jet lag on longer routes
On longer cross-country flights, adjusting your sleep schedule a day or two before departure and staying hydrated in flight can reduce jet lag on arrival.
Screenshot your confirmation
Save a screenshot or PDF of your booking confirmation and boarding pass before you travel, in case you lose signal or battery at the airport.
Check in online when it opens
Most airlines open online check-in 24 hours before departure — checking in early can help with seat selection and, on some airlines, boarding group assignment.
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