SEA → DENSeattle to Denver

live

Direct flights from Seattle (SEA) to Denver (DEN): 35 nonstop departures observed each week across 5 airlines. 79% of the last 19 operated flights arrived within 15 minutes of schedule. The median arrival is 10 minutes early. No cancellations were recorded across the 19 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 17 October 2026 at 10:01 UTC.

Today, SEA → DEN

Sat 17 Oct · local times
  1. 05:00 UA2601United Airlines On scheduleGate B11 DEN est. 08:31sched 08:45
  2. 06:15 WN3753Southwest Airlines On scheduleGate B14 DEN 09:55scheduled
  3. 07:08 AS682Alaska Airlines On scheduleGate D3 DEN est. 10:55sched 11:02
  4. 08:30 UA1505United Airlines On scheduleGate B7A DEN 12:22scheduled
  5. 09:05 DL1358Delta Air Lines On scheduleGate B6 DEN 12:49scheduled
  6. 10:13 AS535Alaska Airlines On scheduleGate D6 DEN est. 13:58sched 14:08
  7. 10:55 WN3754Southwest Airlines On scheduleGate B14 DEN 14:35scheduled
  8. 12:40 WN677Southwest Airlines On scheduleGate B10 DEN 16:20scheduled
  9. 12:43 UA2033United Airlines On scheduleGate B15 DEN 16:34scheduled
  10. 13:16 AS602Alaska Airlines On scheduleGate N12 DEN est. 16:57sched 16:59
  11. 13:55 DL2543Delta Air Lines On scheduleGate B3 DEN est. 17:44sched 17:47
  12. 15:55 UA757United Airlines Sched 15:55Departure not confirmed by the board DEN 19:45scheduled
  13. 16:27 F93406Frontier Airlines Sched 16:27Departure not confirmed by the board DEN 20:17scheduled
  14. 18:54 AS310Alaska Airlines Sched 18:54Departure not confirmed by the board DEN 22:37scheduled
  15. 20:00 DL2851Delta Air Lines Sched 20:00Departure not confirmed by the board DEN est. 23:42sched 23:55

Checked SEA board 02:22 · DEN board 04:01

SEA Seattle heavy · +55
DEN Denver disrupted · +125
1,645 km · ~2h 37m est.
dep bank 05:00–21:1535x weekly
Runs mixed · 5 airlines · 35x weekly · nonstop
79% on time

of the last 19 operated SEA → DEN flights arrived within 15 minutes

Median arrival delay is −10 min. 0 of 19 tracked legs cancelled in the sample. Will a delayed flight be cancelled? →

Median arrival−10 minacross the last 19 operated legs
Flight time~2h 37mestimated from route distance
Weekly departures35x5 direct airlines on the leg
Cancelled0.0%recent route rate · 0 of 19

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 AirlinesAS

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 AirlinesWN

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 · UA333 14:27 Mo Th Fr Su

History

operated legs · board outcomes
10-16AS310arrived+6
10-16AS535arrived−11
10-16AS602arrived−19
10-16AS682arrived−14
10-16DL1358arrived+16
10-16DL2543arrived+1
10-16DL2851arrived+237
10-16F93406arrived−19
10-16UA1218arrived−24
10-16UA1505arrived+4
10-16UA2033arrived−24
10-16UA2601arrived−15
10-16UA333arrived−27
10-16UA757arrived−25
10-16WN1841arrived+6
10-16WN3753arrived+2
10-16WN3754arrived+27
10-16WN3755arrived−10
10-15DL2851arrived+59

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 +55 min heavy 🌤 overcast · S 9 kt Full SEA delay board →
DENDenver +125 min disrupted 🌤 clear · S 6 kt Full DEN delay board →

Weather lens

Current conditions put the pressure at DEN: 40% odds of a 15+ minute delay and around +10 min expected when it bites, measured from this route's own weather-matched delay history. 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?

High disruption likely. The arrival side at DEN is the weaker end, route health score 13/100. 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 120 flights a week between them. Compare carrier days and times in the airline list above.