Independent travel booking service, not affiliated with any airline. Agents available 24/7: (708) 866-8751
SEA → DEN · about 2h 43m nonstop · 1,022 miles · 4 airlines · fares updated September 16, 2026
Fares shown are recorded lows. An agent confirms today's live price on the call.
Licensed agents, 24/7. No charge for a quote.
Call to book from $161(708) 866-8751The lowest fares recorded on this route in recent searches. Call and an agent checks whether a similar fare is still open for your dates.
Recorded fares for SEA to DEN from cached search data, not live quotes. An agent confirms availability and today's price on the call.
Looking for a cheap flight from Seattle to Denver? This page tracks the lowest fares we have recorded on the SEA to DEN route, the airlines that fly it, and the months when prices drop. Fares shown are recent lows, not live quotes; call (708) 866-8751 and an agent will price today's availability with you.
Recorded lows on SEA–DEN start at $161 one-way. That figure comes from cached search data and moves with demand, so treat it as a benchmark for what a good price looks like rather than a guaranteed fare.
Delta Air Lines and United Airlines both operate hubs at one end of this route, so nonstop or single-connection service is usually available, along with American Airlines and Southwest Airlines. Our agents can book any of them and compare fare classes side by side.
Expect roughly 2h 43m nonstop for the 1,022 miles. On routes this length, basic economy and standard economy often differ by less than a checked-bag fee, so it pays to price the higher fare with the bag included.
Lowest recorded one-way fare by departure date, next 12 days with data. Green bars are within 10% of the cheapest day.
Cheapest day in range: Tuesday, September 29 at $143. Recorded lows, not live quotes.
West Coast and Mountain departures spike over summer holidays and the December break; January (after New Year), late April, May, and September are usually the cheapest windows.
Midweek travel almost always beats weekends on price here. If your dates are flexible by a day or two, tell the agent; shifting a Friday departure to Thursday or a Sunday return to Monday is the single most reliable way to cut the fare.
For domestic travel, booking three to eight weeks ahead usually captures the best price. Inside two weeks, fares climb; more than four months out, airlines have not yet released their cheapest inventory.
Carriers most likely to serve this route, with the lowest fare recorded for each where our data names the airline. Agents compare all of them on one call.
| Airline | Recorded from | Changes on standard fares | Lowest fare brand | Call |
|---|---|---|---|---|
| Delta Air Lines | ask an agent | No fee, fare difference | Basic Economy | Call(708) 866-8751 |
| United Airlines | ask an agent | No fee, fare difference | Basic Economy | Call(708) 866-8751 |
| American Airlines | ask an agent | No fee, fare difference | Basic Economy | Call(708) 866-8751 |
| Southwest Airlines | ask an agent | No fee, fare difference | Basic | Call(708) 866-8751 |
Carriers listed are those most likely to serve the pair based on hubs and recorded fares. WarBird Flight is independent and not affiliated with any airline.
Departures use Seattle–Tacoma International Airport (SEA), a hub for Delta.
You will land at Denver International Airport (DEN), a United and Southwest hub.
Fares from a neighboring airport are sometimes far lower than the drive is long. Agents quote all of these on one call.
Licensed agents at our partner agency handle these by phone, 24/7. No charge for a quote.
The lowest one-way fare we have recorded recently is $161. Fares change daily; call (708) 866-8751 for today's price.
A nonstop flight takes about 2h 43m to cover 1,022 miles. Connecting itineraries add two to five hours depending on the layover.
Delta Air Lines, United Airlines, American Airlines, and Southwest Airlines are the carriers most likely to serve this route. We book all of them.
West Coast and Mountain departures spike over summer holidays and the December break; January (after New Year), late April, May, and September are usually the cheapest windows.
Yes. Call (708) 866-8751 and a live agent will search every airline, quote today's fare, and book it for you. WarBird Flight is an independent travel booking service; calls are answered by licensed travel agents at our partner agency.
Seattle–Tacoma International Airport (SEA) is the airport for this route.
A government-issued photo ID such as a REAL ID-compliant driver's license, a passport, or a passport card. Children under 18 flying with an adult do not need ID on domestic flights. If your license is not REAL ID-compliant, bring a passport.
Yes on most carriers, with an unaccompanied-minor service fee and age limits that differ by airline. Nonstop flights are strongly preferred and some airlines require them for younger children. Agents can book the service, note the guardian details, and confirm the fee before you pay.
