Cheap Flights from Seattle to Denver | EazAir
Seattle to Denver flight insights
Average flight time
~2h 48m (estimated)
SEA → DEN
Cheapest month
—
Based on cached fare history
Cheapest cached price
$95
Checking live fares…
Prices shown may not be current. Last checked: Sep 9, 2026.
Planning a trip from Seattle to Denver? The average flight time on this route is ~2h 48m (estimated). The lowest fare we have cached for this route is $95 (last checked Sep 9, 2026).
Seattle to Denver covers a straight-line distance of about 1,022 miles. Based on that distance, a nonstop flight would take approximately ~2h 48m (estimated). Actual flight time varies by airline, aircraft and routing.
Route Quick Facts
| Origin | Seattle (SEA) |
|---|---|
| Destination | Denver (DEN) |
| Average Flight Time | — |
| Cheapest Month to Fly | — |
| Current Lowest Fare | $95 |
| Fares Last Checked | Sep 9, 2026 |
Flight deals from Seattle to Denver
Flights from Seattle to Denver typically cover the 1,024-mile distance in just under two and a half hours. Passengers departing from Seattle-Tacoma International Airport cross over the Cascade Mountains and the Pacific Northwest before descending into Denver International Airport. This specific flight path gives window-seat travelers direct aerial views of the varied terrain between the Puget Sound region and the high-altitude Colorado capital. Multiple major carriers operate direct daily service connecting Seattle to Denver. Alaska Airlines and United Airlines maintain major hubs or significant operations at these respective airports, providing dozens of daily nonstop options between SEA and DEN. Frontier Airlines and Southwest Airlines also fly this route, offering budget-conscious Pacific Northwest travelers competitive base fares for their Rocky Mountain transit. The summer months of June, July, and August represent the busiest travel period for the Seattle to Denver route, driven by outdoor tourism in both Washington and Colorado. December also sees a significant spike in passenger traffic as Seattle residents fly to Denver for ski season access across the Rocky Mountains. Travelers planning trips between SEA and DEN during these peak windows should book tickets early to secure preferred departure times and avoid premium holiday pricing.
About Denver
Popular areas to know in Denver include LoDo (Lower Downtown), RiNo Art District, and Capitol Hill.
A semi-arid climate with over 300 sunny days a year; the high altitude keeps evenings cool even in summer, and winter brings snow to the nearby mountains.
Frequently asked questions
How long does a direct flight from Seattle to Denver take?
Which airlines fly directly from Seattle to Denver?
Which airports will I use when flying from Seattle to Denver?
What is the cheapest month to fly from Seattle to Denver?
Do airlines flying from Seattle to Denver charge extra for checked baggage?
How far in advance should I book my ticket from Seattle to Denver?
What is the total flight distance between Seattle and Denver?
Is there a time difference between Seattle and Denver?
What time does the earliest morning flight leave Seattle for Denver?
When is the last evening flight from Seattle to Denver?
How far is it from Seattle to Denver?
What ID do I need to fly from Seattle to Denver?
Which airlines operate flights from Seattle to Denver?
What's the weather usually like in Denver?
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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