Denver, CO → Seattle, WA flight delays
DEN → SEA · all airlines · 546 flights · May 2026 · source: US BTS
This route is delayed
23%of the time, by +50 min on average when it does.
This is history, not a promise — your specific flight could well be on time.
On-time rate
77%
Delayed 3h+
0.5%
Cancelled
0%
Avg when late
+50m
Best & worst day to fly
Most on-time
Sunday
delayed 19%
Worst
Wednesday
delayed 26%
Which airline is most punctual on DEN → SEA?
Frontierdelayed 13%
Alaskadelayed 14%
Deltadelayed 21%
Uniteddelayed 22%
Southwestdelayed 47%
Frequently asked
How often is the Denver, CO to Seattle, WA flight delayed?
About 23% of DEN → SEA flights arrive late (15+ minutes), by an average of 50 minutes when they do, based on 546 flights in May 2026.
Which airline is most punctual on DEN → SEA?
Frontier, delayed 13% of the time — the best of the 5 airlines flying this route.
What is the best day to fly DEN → SEA?
Sunday is the most on-time (delayed 19%), while Wednesday is the worst (delayed 26%).
Airport overviews