Flight profile · Frontier Airlines
F91175
Denver (DEN) to Seattle (SEA) · scheduled 6:00 AM – 8:01 AM
How F91175 performs
616 operations, January 2024 – August 2026.
Between its first and last recorded date on DEN → SEA, F91175 averaged about 4 operations a week (616 in 971 days, cancelled ones included).
F91175 arrived on time 80.5% of the time, against 74.4% for all DEN → SEA flights, so this departure is 6.1 percentage points better than the route as a whole. Against Frontier Airlines’ own flights on this route it is 5.3 points better.
Source: US DOT Bureau of Transportation Statistics · 616 operations, January 2024 – August 2026 · If F91175 is cancelled or significantly changed, DOT’s automatic refund rule may entitle you to your money back. The refund checker walks through eligibility.
Where F91175 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 |
|---|---|---|---|---|---|
| F91175 | 80.5% | 1.14% | -7 min | 5.6% | 616 |
| Frontier Airlines on DEN → SEA | 75.2% | 1.07% | -5 min | 8.9% | 1,498 |
| All DEN → SEA flights | 74.4% | 0.65% | -3 min | 7.6% | 20,946 |
F91175 cancelled 7 of 616 operations (1.14%), close to the 0.65% for DEN → SEA.
5.6% of F91175’s arrivals were an hour or more late, against 7.6% across DEN → SEA, so the long delays are less common on this number than on the route.
Source: FlyerIntel analysis of US DOT BTS data · January 2024 – August 2026
Why F91175 runs late
Where US DOT attributed the delay minutes on this flight.
crew, maintenance, boarding and fueling, all within the carrier’s control
the inbound aircraft was late, so this flight started late
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 F91175 on DEN → SEA. 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 F91175 comes in late, and what that does to the departure.
The aircraft flying F91175 came in 15 or more minutes late on 21% 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 DEN: 535 of 609 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 |
|---|---|
| F91175 | 21% |
| Network, same turn | 17% |
88 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 F91175’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 DEN late, does that still matter by the time it reaches SEA?
F91175 pushes back an average of 8.2 minutes late and reaches the gate at SEA an average of 2.7 minutes late. The 5.5 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. Its 18.5 minutes on the taxiways at DEN is about what any departure from the airport in that hour spends.
On arrival at SEA, F91175 spends 15.1 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 3.2 minutes longer than a typical SEA arrival (11.9 min).
Taxi-out is gate to wheels up and sits inside the scheduled block; the hourly comparison is 34,782 DEN departures. Taxi-in is landing to gate, set against 526,096 arrivals at SEA. More on taxi time.
Source: FlyerIntel analysis of US DOT BTS data · January 2024 – August 2026
The hour it leaves DEN
F91175 has one departure time, 6:00 AM, so this is what that hour at DEN is worth.
On-time arrival rate. 34,782 departures from DEN are scheduled in the 6 AM–7 AM hour over the period, against 991,655 across the whole day.
F91175 is scheduled out of DEN at 6:00 AM, in the 6 AM–7 AM bank. Departures from DEN in that hour arrive on time 90.8% of the time against 75.8% across the airport’s whole day — the slot alone is worth 15.0 points better before anything about this particular flight is considered.
Both airport figures cover every destination from DEN, 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 F91175 has flown
Carriers reassign flight numbers. F91175 also served these 2 other city pairs in the period.
| Route | Operated | Flights | On time |
|---|---|---|---|
| PIT→MCO Pittsburgh to Orlando | October 5, 2023 – November 15, 2023 | 17 | — |
| PHL→MCO Philadelphia to Orlando | July 1, 2023 – September 5, 2023 | 32 | — |
The figures above describe only DEN → SEA, the route F91175 flies now.
When it goes wrong
The average describes a usual day. This is the day that ruins a connection.
33 min late
against a median of 7 min early
Percentiles over 616 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 |
|---|---|---|---|---|
| DL1731 | Delta Air Lines | 90.1% | 14 min early | 1,095 |
| AS643 | Alaska Airlines | 88.4% | 10 min early | 1,008 |
| F91175 this flight | Frontier Airlines | 80.5% | 7 min early | 616 |
| UA690 | United Airlines | 79.9% | 5 min early | 621 |
| UA2651 | United Airlines | 69.2% | 1 min late | 825 |
Among all 5 departures on this route with at least 600 operations, F91175 has the 3rd highest on-time rate, 9.6 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 616 records of F91175 operating DEN → SEA, 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