SEA → DENSeattle to Denver

live

Direct flights from Seattle (SEA) to Denver (DEN): 35 nonstop departures observed each week across 5 airlines. 73% of the last 26 operated flights arrived within 15 minutes of schedule. The median arrival is 3 minutes early. No cancellations were recorded across the 26 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 7 September 2026 at 19:41 UTC.

SEA Seattle smooth · +7
DEN Denver smooth · +0
1,645 km · ~2h 37m est.
dep bank 05:00–20:0735x weekly
Runs mixed · 5 airlines · 35x weekly · nonstop
73% on time

of the last 26 operated SEA → DEN flights arrived within 15 minutes

Median arrival delay is −3 min. 0 of 26 tracked legs cancelled in the sample. Will a delayed flight be cancelled? →

Median arrival−3 minacross the last 26 operated legs
Flight time~2h 37mestimated from route distance
Weekly departures35x5 direct airlines on the leg
Cancelled0.0%recent route rate · 0 of 26

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 AirlinesAS86% on time

Flights AS682 07:14 daily · AS535 10:08 daily · AS304 12:48 Mo Tu We Th Fr Su · AS602 14:23 daily

Delta Air LinesDL

Flights DL1358 08:40 daily · DL2543 13:55 daily · DL2851 20:07 daily

Frontier AirlinesF9

Flights F93406 14:37 daily · F91176 19:06 daily

Southwest AirlinesWN67% on time

Flights WN1384 06:30 Mo Tu We Th Fr · WN1663 10:20 Sa · WN2860 varies Mo Tu We Th Fr · WN4507 11:10 Mo Tu We Th Fr Su

United AirlinesUA100% on time

Flights UA2601 05:00 daily · UA2031 11:03 Mo Tu We Th Fr Su · UA2832 12:44 daily · UA1762 14:34 Mo We Th Fr Su

History

operated legs · board outcomes
09-07AS535arrived−7
09-07AS682arrived−24
09-07DL1358arrived+3
09-07UA1505arrived−13
09-07UA2031arrived−15
09-07UA2601arrived−28
09-07WN1384arrived−10
09-07WN2860arrived−3
09-06AS304arrived−12
09-06AS310arrived+6
09-06AS535arrived−18
09-06AS602arrived+39
09-06AS682arrived−12
09-06DL1358arrived+16
09-06DL2543arrived+47
09-06DL2851arrived+22
09-06F91176arrived−5
09-06F93406arrived+60
09-06UA1505arrived−4
09-06UA2601arrived+8
09-06UA2832arrived−9
09-06UA757arrived−1
09-06WN2522arrived+6
09-06WN3055arrived+31
09-06WN448arrived+129
09-06WN4697arrived−4

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 +7 min smooth ⛅ overcast · SSW 8 kt Full SEA delay board →
DENDenver +0 min smooth 🌤 mostly cloudy · WNW 11 kt Full DEN delay board →

Weather lens

Current conditions put the pressure at DEN: 36% odds of a 15+ minute delay and around +9 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?

Smooth skies ahead. The departure side at SEA is the weaker end, route health score 94/100. 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 17:40 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 135 flights a week between them. Compare carrier days and times in the airline list above.