Denver, CO → Ontario, CA flight delays
DEN → ONT · all airlines · 205 flights · April 2026 · source: US BTS
This route is delayed
19%of the time, by +55 min on average when it does.
This is history, not a promise — your specific flight could well be on time.
On-time rate
81%
Delayed 3h+
0.5%
Cancelled
0%
Avg when late
+55m
Best & worst day to fly
Most on-time
Tuesday
delayed 4%
Worst
Thursday
delayed 29%
Which airline is most punctual on DEN → ONT?
Uniteddelayed 7%
Frontierdelayed 10%
Southwestdelayed 28%
Frequently asked
How often is the Denver, CO to Ontario, CA flight delayed?
About 19% of DEN → ONT flights arrive late (15+ minutes), by an average of 55 minutes when they do, based on 205 flights in April 2026.
Which airline is most punctual on DEN → ONT?
United, delayed 7% of the time — the best of the 3 airlines flying this route.
What is the best day to fly DEN → ONT?
Tuesday is the most on-time (delayed 4%), while Thursday is the worst (delayed 29%).
Airport overviews