Flight profile · Frontier Airlines
F91820
Phoenix (PHX) to Denver (DEN) · scheduled 6:53 PM – 9:49 PM
How F91820 performs
611 operations, January 2024 – August 2026.
Between its first and last recorded date on PHX → DEN, F91820 averaged about 4 operations a week (611 in 971 days, cancelled ones included).
F91820 arrived on time 78.6% of the time, level with the 78.3% for all PHX → DEN flights: on arrival punctuality it is a typical departure on this route, neither better nor worse.
Source: US DOT Bureau of Transportation Statistics · 611 operations, January 2024 – August 2026 · If F91820 is cancelled or significantly changed, DOT’s automatic refund rule may entitle you to your money back. The refund checker walks through eligibility.
Where F91820 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 |
|---|---|---|---|---|---|
| F91820 | 78.6% | 1.15% | -9 min | 10.4% | 611 |
| Frontier Airlines on PHX → DEN | 77.2% | 0.83% | -7 min | 9.0% | 4,815 |
| All PHX → DEN flights | 78.3% | 0.91% | -5 min | 7.6% | 29,133 |
F91820 cancelled 7 of 611 operations (1.15%), close to the 0.91% for PHX → DEN.
10.4% of F91820’s arrivals were an hour or more late, against 7.6% across PHX → DEN, so the long delays are more common on this number than on the route.
Source: FlyerIntel analysis of US DOT BTS data · January 2024 – August 2026
Why F91820 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 F91820 on PHX → DEN. Only delays of 15 minutes or more are attributed. What the five causes mean
Source: US DOT Bureau of Transportation Statistics · Data covering January 2024 – August 2026
Does a late aircraft delay this flight?
How often the plane that flies F91820 comes in late, and what that does to the departure.
The aircraft flying F91820 came in 15 or more minutes late on 22% of the departures where its previous flight is known. There are not enough departures in both groups to say how the flight left after a late one and after an on-time one.
Matched by tail number to the aircraft’s previous flight into PHX: 548 of 604 departures. Unknown, cancelled or diverted inbounds and gaps over 12 hours are left out.
Against the network at the same turn length
| Share of departures | Inbound landed 15+ late |
|---|---|
| F91820 | 22% |
| Network, same turn | 17% |
67 scheduled minutes is enough to clean and board when the aircraft is on time, with little to spare when it is not.
The network row is every flight with a scheduled turn of 60 to 89 minutes. How often F91820’s aircraft landed 15 or more minutes late is higher than the network’s. There are not enough departures in both groups to compare how it left.
Source: US DOT Bureau of Transportation Statistics · Data covering January 2024 – August 2026
From pushback to gate
When it leaves PHX late, does that still matter by the time it reaches DEN?
F91820 pushes back an average of 18.6 minutes late and reaches the gate at DEN an average of 14.5 minutes late. The 4.1 minutes between those two figures are slack the published schedule already carries, so a late pushback is partly, not fully, made up before the gate. It spends 15.8 minutes on the taxiways at PHX, 2.0 minutes longer than a typical PHX departure in the same hour.
On arrival at DEN, F91820 spends 14.7 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 4.9 minutes longer than a typical DEN arrival (9.8 min).
Taxi-out is gate to wheels up and sits inside the scheduled block; the hourly comparison is 31,262 PHX departures. Taxi-in is landing to gate, set against 991,579 arrivals at DEN. More on taxi time.
Source: FlyerIntel analysis of US DOT BTS data · January 2024 – August 2026
The hour it leaves PHX
F91820 has one departure time, 6:53 PM, so this is what that hour at PHX is worth.
On-time arrival rate. 31,262 departures from PHX are scheduled in the 6 PM–7 PM hour over the period, against 613,275 across the whole day.
F91820 is scheduled out of PHX at 6:53 PM, in the 6 PM–7 PM bank. Departures from PHX in that hour arrive on time 71.3% of the time against 80.2% across the airport’s whole day — the slot alone is worth 8.9 points worse before anything about this particular flight is considered.
Both airport figures cover every destination from PHX, so they describe the slot, not this journey; the route comparison is above. Why the hour matters.
Source: FlyerIntel analysis of US DOT BTS data · January 2024 – August 2026 · Hours below 120 departures are not scored.
Other routes F91820 has flown
Carriers reassign flight numbers. F91820 also served this other city pair in the period.
| Route | Operated | Flights | On time |
|---|---|---|---|
| DEN→GRR Denver to Grand Rapids | April 15, 2024 – May 13, 2024 | 5 | — |
The figures above describe only PHX → DEN, the route F91820 flies now.
When it goes wrong
The average describes a usual day. This is the day that ruins a connection.
60 min late
against a median of 9 min early
F91820 has an average that understates its risk: a typical arrival is 9 min early, but the worst tenth are 69 minutes worse than that. If the trip has something unmissable at the end of it, the median is the wrong number to plan against.
Percentiles over 611 operations; cancelled and diverted flights are counted separately.
Source: US DOT Bureau of Transportation Statistics · Data covering January 2024 – August 2026
Other flights on this route
Same airports, same journey, different odds of arriving on time.
| Flight | Airline | On time | Median arrival | Operations |
|---|---|---|---|---|
| F91376 | Frontier Airlines | 88.6% | 11 min early | 854 |
| F91820 this flight | Frontier Airlines | 78.6% | 9 min early | 611 |
| F92142 | Frontier Airlines | 67.6% | 2 min early | 797 |
Among all 3 departures on this route with at least 600 operations, F91820 has the 2nd highest on-time rate, 10.0 points behind the best. Every departure here has at least 600 operations; the other rows are the most punctual on the route, not all of them.
Data and methodology
Calculated by FlyerIntel from 611 records of F91820 operating PHX → 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 reported separately, not in the on-time rate.
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