Ontario, CA → Denver, CO flight delays
ONT → DEN · all airlines · 205 flights · April 2026 · source: US BTS
This route is delayed
14%of the time, by +63 min on average when it does.
This is history, not a promise — your specific flight could well be on time.
On-time rate
86%
Delayed 3h+
1%
Cancelled
0%
Avg when late
+63m
Best & worst day to fly
Most on-time
Saturday
delayed 8%
Worst
Thursday
delayed 21%
Which airline is most punctual on ONT → DEN?
Uniteddelayed 2%
Frontierdelayed 10%
Southwestdelayed 22%
Frequently asked
How often is the Ontario, CA to Denver, CO flight delayed?
About 14% of ONT → DEN flights arrive late (15+ minutes), by an average of 63 minutes when they do, based on 205 flights in April 2026.
Which airline is most punctual on ONT → DEN?
United, delayed 2% of the time — the best of the 3 airlines flying this route.
What is the best day to fly ONT → DEN?
Saturday is the most on-time (delayed 8%), while Thursday is the worst (delayed 21%).
Airport overviews