Flight profile · Frontier Airlines
F91439
Salt Lake City (SLC) to Phoenix (PHX) · scheduled 1:21 PM – 3:15 PM
How F91439 performs
551 operations, 2023-11-16 to 2026-05-18.
F91439 arrived on time 76.7% of the time, against 83.8% for all SLC → PHX flights — this specific departure is 7.1 percentage points worse than the route as a whole. Against Frontier Airlines’s own flights on this route it is 2.9 points worse.
Source: US DOT Bureau of Transportation Statistics · 551 operations between 2023-11-16 to 2026-05-18
Against the rest of the route
| On time | Cancelled | Median delay | Severe | Flights | |
|---|---|---|---|---|---|
| F91439 | 76.7% | 1.63% | -10 min | 9.8% | 551 |
| Frontier Airlines on SLC → PHX | 79.7% | 1.38% | -11 min | 8.6% | 1,954 |
| All SLC → PHX flights | 83.8% | 0.43% | -8 min | 5.0% | 17,331 |
Source: FlyerIntel analysis of US DOT BTS data · 2023-11-16 to 2026-05-18
Other routes F91439 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.
| Route | Operated | Flights | On time |
|---|---|---|---|
| DEN→SLC Denver to Salt Lake City | 2024-07-08 – 2024-08-02 | 8 | — |
Because the same number has served different journeys, the statistics above describe only the route F91439 currently operates. Blending them would produce an average of two different flights.
Why F91439 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 F91439 on SLC → PHX. 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 SLC → PHX
Same airports, same journey — and not the same odds of arriving on time.
| Flight | Airline | On time | Median arrival | Operations |
|---|---|---|---|---|
| DL1447 | Delta Air Lines | 92.5% | 12 min early | 752 |
| OO6327 | SkyWest Airlines | 90.8% | 10 min early | 665 |
| DL1431 | Delta Air Lines | 87.9% | 7 min early | 754 |
| DL1496 | Delta Air Lines | 81.8% | 6 min early | 747 |
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 551 records of F91439 operating SLC → PHX, 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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