Seattle to Denver (SEA-DEN): nonstop upgrade & award space

United Airlines, Alaska Airlines, Delta Air Lines, Frontier Airlines, and American Airlines fly nonstop between Seattle (SEA) and Denver (DEN), roughly 141 times a week. With this many departures on a short sector, premium cabins are small and turn over daily, so upgrade or award space opens and closes within hours. 2LNR tracks confirmed upgrade and award space on Alaska Airlines, Delta Air Lines, and American Airlines, on every SEA to DEN departure, so you know which flights have space before you book.

Schedule last confirmed . Departure times come from 2LNR's schedule data; confirm with the airline before you book.

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141
Nonstop flights a week
1,022 mi
Nonstop distance
Free
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Seattle to Denver flight schedule

Scheduled nonstop departures for SEA to DEN, last checked against our schedule feed on September 6, 2026. Airlines retime and cancel flights, so confirm with the airline before you book.

Schedule data dated .

Scheduled nonstop departures from Seattle (SEA) to Denver (DEN)
Date Flight Airline Departs SEA Arrives DEN Duration Aircraft
UA 2601United Airlines05:0008:452h 45m32Q
AS 682Alaska Airlines, Inc.07:2111:182h 57m7M8
UA 1505United Airlines08:4012:322h 52m738
DL 1358Delta Air Lines08:5512:452h 50m223
AS 535Alaska Airlines, Inc.10:0514:063h 1m73J
UA 2031United Airlines11:0314:542h 51m738
UA 1534United Airlines12:4416:352h 51m32Q
UA 2418United Airlines12:4416:352h 51m32Q
UA 2832United Airlines12:4416:352h 51m32Q
AS 304Alaska Airlines, Inc.12:4816:432h 55m73J
UA 1351United Airlines12:5016:422h 52m32Q
DL 2543Delta Air Lines13:3917:312h 52m738
DL 2759Delta Air Lines13:5017:382h 48m221
AS 602Alaska Airlines, Inc.14:2318:102h 47m73J
F9 3406Frontier Airlines14:3718:332h 56m32N
UA 1943United Airlines15:5419:452h 51m7M8
UA 757United Airlines15:5419:452h 51m7M8
F9 1176Frontier Airlines19:0622:582h 52m321
AS 310Alaska Airlines, Inc.19:3223:192h 47m7M9
DL 2851Delta Air Lines20:0023:472h 47m223
UA 2601United Airlines05:0008:452h 45m32Q
AS 682Alaska Airlines, Inc.07:2111:182h 57m73J
UA 1505United Airlines08:4012:322h 52m738
DL 1358Delta Air Lines08:5512:452h 50m223
AS 535Alaska Airlines, Inc.10:0514:063h 1m7M9
UA 2031United Airlines11:0314:542h 51m738
UA 1534United Airlines12:4416:352h 51m32Q
UA 2418United Airlines12:4416:352h 51m32Q
UA 2832United Airlines12:4416:352h 51m32Q
AS 304Alaska Airlines, Inc.12:4816:432h 55m73J
UA 1351United Airlines12:5016:422h 52m32Q
DL 2543Delta Air Lines13:3917:332h 54m223
DL 2759Delta Air Lines13:5017:382h 48m221
AS 602Alaska Airlines, Inc.14:2318:102h 47m73H
UA 1762United Airlines14:3418:252h 51m32Q
UA 1943United Airlines15:5419:452h 51m7M8
UA 757United Airlines15:5419:452h 51m7M8
F9 3406Frontier Airlines16:2720:212h 54m32N
UA 1218United Airlines18:1521:592h 44m32Q
AS 310Alaska Airlines, Inc.19:3223:192h 47m73J

Showing the first 40 of 142 scheduled SEA to DEN departures across the next 7 days with service. Every remaining date is on the interactive map.

Departure and arrival times are local at their own airport, so an arrival can fall on a different local date than the departure; the duration column is the true elapsed flying time. A dash means the airline has not filed that value in the schedule data we hold. Aircraft are IATA equipment codes as filed, and can change up to departure.

See every SEA to DEN date on the interactive map

Confirmed upgrade & award space on SEA to DEN departures

2LNR tracks confirmed upgrade and award space on Alaska Airlines, Delta Air Lines, and American Airlines, segment by segment and date by date. Open the calendar for Seattle to Denver to see which departures have space, the next 14 days free on every product and the full horizon on Pro.

See real availability

Confirmed upgrade and award seats on each SEA to DEN departure, checked against live inventory so you know what is open before you book.

Set an alert

Premium inventory turns over fast. Watch this route and 2LNR notifies you when space appears on a date you are tracking.

Plan on the map

See SEA to DEN on the interactive route map, with schedules, connections, and route statistics.

Airlines flying Seattle to Denver nonstop

Carriers operating SEA to DEN nonstop in the current schedule. 2LNR tracks confirmed upgrade and award space on each of them.

See SEA to DEN on the interactive map →

Frequently asked questions about SEA to DEN

How far is Denver from Seattle?
SEA to DEN covers about 1,022 miles nonstop. Flight times vary by aircraft and season; the schedule table on this page lists each scheduled departure with its own times.
Which airlines fly nonstop from SEA to DEN?
United Airlines, Alaska Airlines, Delta Air Lines, Frontier Airlines, and American Airlines fly the route nonstop. 2LNR tracks confirmed upgrade and award space on Alaska Airlines, Delta Air Lines, and American Airlines.
How many flights a week are there from SEA to DEN?
About 141 nonstop flights a week run between Seattle and Denver in the current schedule, operated by United Airlines, Alaska Airlines, Delta Air Lines, Frontier Airlines, and American Airlines. Frequency shifts by season, and the schedule table on this page shows what is scheduled next.
What time do flights from SEA to DEN depart?
Scheduled SEA to DEN nonstops in the next 7 days with service leave between 05:00 and 20:00, local time at Seattle. The schedule table on this page lists every departure by date, with its arrival time and aircraft.
How do I check upgrade or award availability on SEA to DEN?
Open the SEA to DEN route on the interactive map or the matrix to see confirmed upgrade and award space by date on Alaska Airlines, Delta Air Lines, and American Airlines, the next 14 days free and the full horizon on Pro. On Pro you can also set an alert on the route and 2LNR notifies you when space opens.

Never miss SEA to DEN upgrade or award space

See what is open by date on this route, the next 14 days free on every product and the full horizon on Pro.

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