About 1 in 5 F9 3971 flights from Dallas arrived 15+ minutes late, diverted or cancelled over the past year (20%); 1.0% were cancelled. The typical flight landed 11 minutes early.
F9 3971: DFW → PHX
Scheduled to leave Dallas at 11:54 a.m. local time. Over the past year it arrived on time 80% of the time (289 flights), in line with other F9 flights on the route at that hour (82%). Last seen in the data Aug 31, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 47 | 72% |
| Tuesday | 37 | 81% |
| Wednesday | 31 | 81% |
| Thursday | 47 | 77% |
| Friday | 44 | 82% |
| Saturday | 44 | 86% |
| Sunday | 39 | 82% |
Why it was late
All flights DFW → PHX · Connecting off F9 3971? Check the risk
Questions
How often is F9 3971 from DFW to PHX late?
Frontier Airlines 3971 from Dallas/Fort Worth, TX to Phoenix, AZ arrived 15 or more minutes late, was diverted or was cancelled on 20% of 289 scheduled flights between September 2025 and August 2026. 1.0% 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.