How often are ONT to DEN flights on time?

Flights from Ontario (ONT) to Denver (DEN) arrive on time 89% of the time across 15,324 flights of official data.

Which airline is most reliable on the ONT to DEN route?

United Airlines has the best on-time record on this route at 90% across 4,376 flights.

Route reliability

Flights from Ontario to Denver arrive on time 89% of the time across 15,324 flights. Here’s how each airline really performs.

0.0

On-time rate

15,324 flights

On-time = arrived within 15 minutes of schedule, per BTS TranStats. Compare the reverse leg DEN → ONT.

How to Pick a Reliable Flight (Not Just the Cheapest)

A practical checklist for booking the flight that gets you there — not just the cheap one.

Nonstop vs. Connecting Flights: The Reliability Trade-off

A stop multiplies the ways a trip can break. When it's worth it — and how to de-risk it.

Do Morning Flights Really Have Fewer Delays?

Yes — and there's a clear reason. How delays snowball through the day.

Are Some Airlines Really More Reliable Than Others?

The reliability gap between airlines is real — here's what actually drives it.

Score real ONT–DEN flights on reliability, weather, and connection safety — not just price.