Flight profile · Frontier Airlines
F91790
Portland (PDX) to Denver (DEN) · scheduled 6:05 AM – 10:13 AM
How F91790 performs
843 operations, November 2023 – July 2026.
F91790 arrived on time 79.8% of the time, against 82.6% for all PDX → DEN flights, so this departure is 2.8 percentage points worse than the route as a whole. Against Frontier Airlines’ own flights on this route it is 1.8 points better.
Source: US DOT Bureau of Transportation Statistics · 843 operations, November 2023 – July 2026 · If F91790 is cancelled or significantly changed, DOT’s automatic refund rule may entitle you to your money back. The refund checker walks through eligibility.
Where F91790 is right now
A live reading, only if you ask for it. It is not part of the reliability record above.
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Against the rest of the route
| Flight or route | On time | Cancelled | Median delay | Severe | Flights |
|---|---|---|---|---|---|
| F91790 | 79.8% | 1.07% | -4 min | 5.6% | 843 |
| Frontier Airlines on PDX → DEN | 78.0% | 1.12% | -2 min | 7.2% | 1,342 |
| All PDX → DEN flights | 82.6% | 0.67% | -6 min | 5.0% | 13,768 |
Source: FlyerIntel analysis of US DOT BTS data · November 2023 – July 2026
Why F91790 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 and fueling, all 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 F91790 on PDX → DEN. Only delays of 15 minutes or more are attributed.
Source: US DOT Bureau of Transportation Statistics · Data covering November 2023 – July 2026
Does a late aircraft delay this flight?
How often the plane that flies F91790 comes in late, and what that does to the departure.
When the aircraft came in 15 or more minutes late, F91790 pushed back an average of 25 minutes late; when it came in on time or early, an average of 1 minute late.
Each departure is matched to the flight the same aircraft flew into PDX just before it, using the tail number in the DOT file, 832 of 835 departures in all. A departure is left out when that flight is unknown, was cancelled or diverted, or the aircraft had sat for more than 12 hours. A flight the airline cancelled never left and is not in the count, and one flown by a substitute aircraft is matched to the aircraft that flew it, not to the one first planned.
Against the network at the same turn length
| Share of departures | Inbound landed 15+ late | Left 15+ late after a late inbound | Left 15+ late after an on-time inbound |
|---|---|---|---|
| F91790 | 22% | 47% | 8% |
| Network, same turn | 17% | 68% | 9% |
The schedule leaves a normal turn: enough time to clean and board if the aircraft is on time, little to spare if it is not.
The network row is every flight with a scheduled turn of 60 to 89 minutes. How often F91790’s aircraft landed 15 or more minutes late is higher than the network’s and, once the aircraft was late, how often F91790 left 15 or more minutes late is lower than the network’s.
More: Which Flight Numbers Pay for a Late Aircraft lists the flight numbers that pass a late aircraft on.
Source: US DOT Bureau of Transportation Statistics · Data covering November 2023 – July 2026
From pushback to gate
When it leaves PDX late, does that still matter by the time it reaches DEN?
On arrival at DEN, F91790 spends 16.7 min taxiing from touchdown to the gate — ground time a connecting passenger sits through before they can even leave the aircraft, on top of however late the flight itself ran. That is 6.9 minutes longer than a typical DEN arrival (9.8 min).
Departure delay is averaged over every pushback and arrival delay over every completed arrival, so the two counts differ by the flights that never reached DEN. Taxi-out is gate to wheels up and sits inside the scheduled block rather than on top of it; the comparison is 11,314 departures from PDX scheduled in the clock hour F91790 most often leaves in. Taxi-in is landing to gate, compared against every arrival FlyerIntel has on file at DEN (963,027 flights), not just F91790’s own. More on taxi time.
Source: FlyerIntel analysis of US DOT BTS data · November 2023 – July 2026
The hour it leaves PDX
Part of any flight’s record belongs to the clock rather than to the flight. F91790 has one departure time, so this is what that time is worth.
On-time arrival rate. 11,314 departures from PDX are scheduled in the 6 AM–7 AM hour over the period, against 187,633 across the whole day.
F91790 is scheduled out of PDX at 6:05 AM, in the 6 AM–7 AM bank. Departures from PDX in that hour arrive on time 93.1% of the time against 83.2% across the airport’s whole day — the slot alone is worth 9.9 points better before anything about this particular flight is considered.
The two airport figures cover every departure from PDX to every destination, so they describe the slot rather than this journey — the like-for-like comparison against the route is above. Hours are scheduled local, and a number whose schedule moved between banks inside the period has no single hour and is not described here at all. Why the hour matters.
Source: FlyerIntel analysis of US DOT BTS data · November 2023 – July 2026 · Hours below 120 departures are not scored.
Other routes F91790 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 |
|---|---|---|---|
| DFW→RDU Dallas–Fort Worth to Raleigh–Durham | July 1, 2023 – November 15, 2023 | 75 | — |
Because the same number has served different journeys, the statistics above describe only the route F91790 currently operates. Blending them would produce an average of two different flights.
When it goes wrong
The average describes a usual day. This is the day that ruins a connection.
39 min late
against a median of 4 min early
Percentiles over 843 operations; cancelled and diverted flights are counted separately.
Source: US DOT Bureau of Transportation Statistics · Data covering November 2023 – July 2026
Other flights on this route
Same airports, same journey, different odds of arriving on time.
| Flight | Airline | On time | Median arrival | Operations |
|---|---|---|---|---|
| UA459 | United Airlines | 96.2% | 14 min early | 798 |
| F91790 this flight | Frontier Airlines | 79.8% | 4 min early | 843 |
Every departure listed carries at least 600 operations, so the comparison is between figures that mean something. F91790 is placed in the same ordering rather than left out of it; the rows around it are the most punctual departures on the route, not all of them, so this is a comparison and not a rank. Schedules change; confirm the departure still operates before booking around this.
Data and methodology
Calculated by FlyerIntel from 843 records of F91790 operating PDX → DEN, 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.
Full methodology · Data sources · Report a problem
Related research: Most and Least Reliable Flight Numbers · The Delay You Inherit · Making Up Time in the Air
Analysis last recomputed