SEA → DENSeattle to Denver

live

Direct flights from Seattle (SEA) to Denver (DEN): 130 nonstop departures observed each week across 5 airlines. 90% of the last 20 tracked flights arrived within 15 minutes of schedule. The median arrival is 11 minutes early. No cancellations were recorded across the 20 tracked flights. The nonstop covers 1,645 km, an estimated 2 hours 37 minutes in the air. Measured by Pro Flight Search from live flight boards at Seattle and Denver. Updated 29 October 2026 at 18:07 UTC.

Today, SEA → DEN

Thu 29 Oct · local times
  1. 05:05 UA757United Airlines Departed Landed 08:35 −7
  2. 05:50 WN3753Southwest Airlines Departed Landed 09:39 +9
  3. 07:08 AS682Alaska Airlines Departed Landed 10:49 −13
  4. 08:30 UA1505United Airlines Departed DEN est. 12:25 +11In the air · sched 12:14
  5. 09:00 UA3903United Departed ·
  6. 09:05 DL1358Delta Air Lines Departed DEN est. 12:53In the air · sched 12:49
  7. 10:13 AS535Alaska Airlines Sched 10:13Departure not confirmed by the board DEN est. 13:52sched 14:08
  8. 11:05 WN3754Southwest Airlines On scheduleGate B10 DEN est. 14:35sched 14:45
  9. 12:45 UA1534United Airlines On scheduleGate B7A DEN est. 16:22sched 16:26
  10. 13:16 AS602Alaska Airlines On scheduleGate C3 DEN 16:59scheduled
  11. 13:55 DL2543Delta Air Lines On scheduleGate B6 DEN est. 17:40sched 17:47
  12. 14:10 WN3755Southwest Airlines On scheduleGate B14 DEN 17:55scheduled
  13. 15:49 UA725United Airlines On scheduleGate B9 DEN 19:30scheduled
  14. 16:15 WN1841Southwest Airlines On scheduleGate B14 DEN 20:00scheduled
  15. 18:54 AS310Alaska Airlines On scheduleGate N20 DEN 22:37scheduled
  16. 19:04 UA1218United Airlines On scheduleGate B9 DEN 22:45scheduled
  17. 20:00 DL2851Delta Air Lines On scheduleGate B1 DEN est. 23:45sched 23:55

Checked SEA board 10:22 · DEN board 12:07

SEA Seattle busy · +20
DEN Denver smooth · +0
1,645 km · ~2h 37m est.
dep bank 05:00–21:15130x weekly
Runs reliable · 5 airlines · 130x weekly · nonstop
90% on time

of the last 20 tracked SEA → DEN flights arrived within 15 minutes

Median arrival delay is −11 min. 0 of 20 tracked legs cancelled in the sample. Will a delayed flight be cancelled? →

Median arrival−11 minacross the last 20 arrivals
Flight time~2h 37mestimated from route distance
Weekly departures130x5 direct airlines on the leg
Cancelled0.0%recent route rate · 0 of 20

The week

scheduled departures · origin local time
06121824
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Alaska AirlinesDelta Air LinesFrontier AirlinesSouthwest Airlines

Each mark is a scheduled departure at its origin-local time, observed operating in the last 7 days. Today is highlighted.

Who flies it

observed on the boards · 7 days
Alaska AirlinesAS100% on time

Flights AS682 07:08 daily · AS535 10:13 daily · AS602 13:16 daily · AS310 18:54 daily

Delta Air LinesDL

Flights DL1358 09:05 daily · DL2543 13:55 daily · DL2851 20:00 daily

Frontier AirlinesF9

Flights F93406 16:27 daily

Southwest AirlinesWN60% on time

Flights WN3753 varies daily · WN3754 varies daily · WN677 12:40 Sa · WN2702 13:25 Tu We

United AirlinesUA100% on time

Flights UA2601 05:00 daily · UA1505 08:30 daily · UA2033 12:43 daily · UA1534 12:45 Mo Tu We Th Su

History

operated legs · board outcomes
10-29AS682arrived−13
10-29UA757arrived−7
10-29WN3753arrived+9
10-28AS310arrived+12
10-28AS535arrived−11
10-28AS602arrived−18
10-28AS682arrived−20
10-28DL1358arrived−4
10-28DL2543arrived−30
10-28DL2851arrived−19
10-28F93406arrived−14
10-28UA1218arrived−32
10-28UA1505arrived−20
10-28UA1534arrived−15
10-28UA725arrived−7
10-28UA757arrived−5
10-28WN1448arrived+27
10-28WN2702arrived+20
10-28WN3753arrived−13
10-28WN3754arrived+7

Actual board outcomes rather than schedules, paired departure and arrival per flight and day.

Full board history, day by day →

Airports right now

live boards
SEASeattle +20 min busy 🌤 mostly cloudy · ESE 5 kt Full SEA delay board →
DENDenver +0 min smooth 🌤 scattered clouds · W 3 kt Full DEN delay board →

Weather lens

Conditions are tightest at DEN: a 38% chance of a 15+ minute delay. In this weather, the more delayed of the two airports is typically about +9 min. Both figures come from the two airports' delay records in similar weather. See live delays → · Weather risk by airport →

How the Seattle to Denver route actually runs

Pro Flight Search records official board updates for nonstop SEA to DEN flights through the day: schedules, estimates, gate pushes and actual departures. The verdict above comes from operated flights, so it reflects what this route does rather than what the timetable promises.

Planning around a delay? Live airport delays · Weather delay risk map · Will a delayed flight be cancelled? · Do planes make up time in the air? · How we measure

Cite this data

Journalists, bloggers, and researchers may cite this page with attribution and a link to Pro Flight Search.

Suggested citation

Pro Flight Search: Seattle (SEA) to Denver (DEN) route reliability, measured from operated flights on official airport boards.

Canonical URL
https://proflightsearch.com/search-flights/SEA-DEN
How we measure this →

SEA to DEN questions

Is SEA–DEN running on time right now?

Smooth skies ahead. The departure side at SEA is the weaker end, route health score 87/100. The airports section above carries the live status and delay window at both ends.

Morning or evening flight on SEA–DEN?

Operators schedule morning departures around 05:00 and evening departures around 18:05 from SEA. Earlier flights typically land before destination-airport delays accumulate later in the day; check the DEN delay card to confirm conditions when you'd arrive.

How long is the flight from SEA to DEN?

Great-circle distance is 1,645 km. With typical jet cruise speed plus taxi, climb and descent, expect roughly 146–171 min gate-to-gate on this route.

How often does SEA–DEN fly?

5 carriers operate this route, around 130 flights a week between them. Compare carrier days and times in the airline list above.