About 1 in 7 F9 1248 flights from Denver arrived 15+ minutes late, diverted or cancelled over the past year (15%); 0.0% were cancelled. The typical flight landed 10 minutes early.
F9 1248: DEN → GRR
Scheduled to leave Denver at 3:10 p.m. local time. Over the past year it arrived on time 85% of the time (148 flights), in line with other F9 flights on the route at that hour (84%). Last seen in the data Aug 31, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 36 | 89% |
| Tuesday | 1 | — |
| Wednesday | 4 | — |
| Thursday | 23 | 83% |
| Friday | 35 | 94% |
| Saturday | 24 | 88% |
| Sunday | 25 | 72% |
Why it was late
All flights DEN → GRR · Connecting off F9 1248? Check the risk
Questions
How often is F9 1248 from DEN to GRR late?
Frontier Airlines 1248 from Denver, CO to Grand Rapids, MI arrived 15 or more minutes late, was diverted or was cancelled on 15% of 148 scheduled flights between September 2025 and August 2026. 0.0% 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.