About 1 in 3 F9 3985 flights from Philadelphia arrived 15+ minutes late, diverted or cancelled over the past year (33%); 3.5% were cancelled. The typical flight landed 7 minutes early.
F9 3985: PHL → DFW
Scheduled to leave Philadelphia at 8:24 p.m. local time. Over the past year it arrived on time 67% of the time (172 flights), worse than other F9 flights on the route at that hour (77%). Last seen in the data Aug 17, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 36 | 50% |
| Tuesday | 14 | — |
| Wednesday | 14 | — |
| Thursday | 24 | 75% |
| Friday | 35 | 69% |
| Saturday | 24 | 71% |
| Sunday | 25 | 72% |
Why it was late
All flights PHL → DFW · Connecting off F9 3985? Check the risk
Questions
How often is F9 3985 from PHL to DFW late?
Frontier Airlines 3985 from Philadelphia, PA to Dallas/Fort Worth, TX arrived 15 or more minutes late, was diverted or was cancelled on 33% of 172 scheduled flights between September 2025 and August 2026. 3.5% 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 Frontier Airlines for today's flight. Method.