About 1 in 4 AA 1666 flights from Phoenix arrived 15+ minutes late, diverted or cancelled over the past year (27%); 1.3% were cancelled. The typical flight landed 6 minutes early.
AA 1666: PHX → ONT
Scheduled to leave Phoenix at 6:03 p.m. local time. Over the past year it arrived on time 73% of the time (237 flights), in line with other AA flights on the route at that hour (71%). Last seen in the data Aug 31, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 32 | 72% |
| Tuesday | 33 | 79% |
| Wednesday | 34 | 71% |
| Thursday | 33 | 82% |
| Friday | 35 | 57% |
| Saturday | 35 | 77% |
| Sunday | 35 | 74% |
Why it was late
All flights PHX → ONT · Connecting off AA 1666? Check the risk
Questions
How often is AA 1666 from PHX to ONT late?
American Airlines 1666 from Phoenix, AZ to Ontario, CA arrived 15 or more minutes late, was diverted or was cancelled on 27% of 237 scheduled flights between September 2025 and August 2026. 1.3% were cancelled.
Flight numbers change. Figures cover flights with this airline, number and route only. "Likely range" is the 95% interval for the true on-time rate given the number of flights. This is history, not live status: check American Airlines for today's flight. Method.