Seattle, WA → Denver, CO flight delays
SEA → DEN · all airlines · 470 flights · April 2026 · source: US BTS
This route is delayed
12%of the time, by +44 min on average when it does.
This is history, not a promise — your specific flight could well be on time.
On-time rate
88%
Delayed 3h+
0.2%
Cancelled
0.2%
Avg when late
+44m
Best & worst day to fly
Most on-time
Monday
delayed 6%
Worst
Friday
delayed 18%
Which airline is most punctual on SEA → DEN?
Uniteddelayed 4%
Alaskadelayed 4%
SkyWestdelayed 16%
Southwestdelayed 20%
Frontierdelayed 24%
Deltadelayed 27%
Frequently asked
How often is the Seattle, WA to Denver, CO flight delayed?
About 12% of SEA → DEN flights arrive late (15+ minutes), by an average of 44 minutes when they do, based on 470 flights in April 2026.
Which airline is most punctual on SEA → DEN?
United, delayed 4% of the time — the best of the 6 airlines flying this route.
What is the best day to fly SEA → DEN?
Monday is the most on-time (delayed 6%), while Friday is the worst (delayed 18%).
Airport overviews