St. Louis, MO → Denver, CO flight delays
STL → DEN · all airlines · 310 flights · May 2026 · source: US BTS
This route is delayed
28%of the time, by +74 min on average when it does.
This is history, not a promise — your specific flight could well be on time.
On-time rate
72%
Delayed 3h+
1.9%
Cancelled
0.3%
Avg when late
+74m
Best & worst day to fly
Most on-time
Sunday
delayed 20%
Worst
Thursday
delayed 37%
Which airline is most punctual on STL → DEN?
Uniteddelayed 21%
Southwestdelayed 33%
Frequently asked
How often is the St. Louis, MO to Denver, CO flight delayed?
About 28% of STL → DEN flights arrive late (15+ minutes), by an average of 74 minutes when they do, based on 310 flights in May 2026.
Which airline is most punctual on STL → DEN?
United, delayed 21% of the time — the best of the 2 airlines flying this route.
What is the best day to fly STL → DEN?
Sunday is the most on-time (delayed 20%), while Thursday is the worst (delayed 37%).
Airport overviews