Flight profile · Frontier Airlines
F91248
Denver (DEN) to Grand Rapids (GRR) · scheduled 3:15 PM – 7:44 PM
How F91248 performs
367 operations, 2023-11-17 to 2026-06-29.
F91248 arrived on time 80.8% of the time, against 75.3% for all DEN → GRR flights — this specific departure is 5.5 percentage points better than the route as a whole. Against Frontier Airlines’s own flights on this route it is 1.0 points better.
Source: US DOT Bureau of Transportation Statistics · 367 operations between 2023-11-17 to 2026-06-29
Against the rest of the route
| On time | Cancelled | Median delay | Severe | Flights | |
|---|---|---|---|---|---|
| F91248 | 80.8% | 0.54% | -7 min | 7.4% | 367 |
| Frontier Airlines on DEN → GRR | 79.8% | 0.41% | -7 min | 7.2% | 487 |
| All DEN → GRR flights | 75.3% | 0.39% | -2 min | 6.9% | 3,850 |
Source: FlyerIntel analysis of US DOT BTS data · 2023-11-17 to 2026-06-29
Other routes F91248 has flown
A flight number is a slot in a schedule, and carriers reassign it. These are the other city pairs this number served in the analysis period.
Because the same number has served different journeys, the statistics above describe only the route F91248 currently operates. Blending them would produce an average of two different flights.
Why F91248 runs late
Where US DOT attributed the delay minutes on this flight.
the inbound aircraft was late, so this flight started late
crew, maintenance, boarding, fuelling — within the carrier’s control
airspace and airport capacity, including weather-driven flow control
weather severe enough to stop this flight specifically
Share of the delay minutes US DOT attributed to each cause for F91248 on DEN → GRR. A single late flight can carry more than one cause, and only delays of fifteen minutes or more are attributed at all.
Other departures on DEN → GRR
Same airports, same journey — and not the same odds of arriving on time.
| Flight | Airline | On time | Median arrival | Operations |
|---|---|---|---|---|
| UA2637 | United Airlines | 87.3% | 6 min early | 824 |
Every departure listed carries at least 600 operations, so the comparison is between figures that mean something. Schedules change; confirm the departure still operates before booking around this.
Data and methodology
Calculated by FlyerIntel from 367 records of F91248 operating DEN → GRR, published by the US DOT Bureau of Transportation Statistics. A flight counts as delayed when it arrives 15 or more minutes after schedule. Cancelled and diverted flights are excluded from the on-time rate and reported separately. Flight numbers are resolved as carrier plus number plus route, because the same number serves different routes over time.
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