Flight profile · Frontier Airlines
F91670
Atlanta (ATL) to Raleigh–Durham (RDU) · scheduled 10:44 PM – 12:10 AM
How F91670 performs
654 operations, November 2023 – July 2026.
F91670 arrived on time 62.2% of the time, against 80.2% for all ATL → RDU flights, so this departure is 18.0 percentage points worse than the route as a whole. Against Frontier Airlines’ own flights on this route it is 3.0 points worse.
Source: US DOT Bureau of Transportation Statistics · 654 operations, November 2023 – July 2026 · If F91670 is cancelled or significantly changed, DOT’s automatic refund rule may entitle you to your money back. The refund checker walks through eligibility.
What stands out
How F91670 compares to other flight numbers, not just to itself.
This flight runs unusually far behind the ATL → RDU route as a whole, worse than 95% of 11,788 comparable flight numbers.
62.2% on time for this specific departure, against 80.2% for every ATL → RDU flight.
Source: FlyerIntel analysis of US DOT BTS data · November 2023 – July 2026 · The one thing about this specific departure that ranks most extreme against every other published flight number, out of everything FlyerIntel checks — shown only when something clears a real statistical bar, not for every flight.
Where F91670 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 |
|---|---|---|---|---|---|
| F91670 | 62.2% | 1.99% | 1 min | 15.6% | 654 |
| Frontier Airlines on ATL → RDU | 65.2% | 2.30% | 0 min | 14.5% | 1,524 |
| All ATL → RDU flights | 80.2% | 0.95% | -5 min | 6.3% | 14,366 |
F91670 has cancelled 1.99% of its scheduled departures (13 of 654), against 0.95% for all ATL → RDU flights — this specific departure cancels 1.0 percentage points more often than the route as a whole. Different flight numbers on the same route can carry different aircraft, crews and schedules, so this is a fact about F91670 specifically, not about the route it flies.
Source: FlyerIntel analysis of US DOT BTS data · November 2023 – July 2026
Why F91670 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 F91670 on ATL → RDU. 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 F91670 comes in late, and what that does to the departure.
When the aircraft came in 15 or more minutes late, F91670 pushed back an average of 51 minutes late; when it came in on time or early, an average of 3 minutes late.
Each departure is matched to the flight the same aircraft flew into ATL just before it, using the tail number in the DOT file, 553 of 641 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 |
|---|---|---|---|
| F91670 | 42% | 67% | 15% |
| 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 F91670’s aircraft landed 15 or more minutes late is higher than the network’s and, once the aircraft was late, how often F91670 left 15 or more minutes late is about the same as 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 ATL late, does that still matter by the time it reaches RDU?
F91670 pushes back an average of 26.9 minutes late and reaches the gate at RDU an average of 22.3 minutes late. The 4.6 minutes between those two figures are slack the published schedule already carries, which is why a late pushback on this flight does not reliably become a late arrival. It spends 19.0 minutes on the taxiways at ATL, 2.4 minutes longer than a typical ATL departure in the same hour.
On arrival at RDU, F91670 spends 9.7 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 2.8 minutes longer than a typical RDU arrival (6.9 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 RDU. Taxi-out is gate to wheels up and sits inside the scheduled block rather than on top of it; the comparison is 72,288 departures from ATL scheduled in the clock hour F91670 most often leaves in. Taxi-in is landing to gate, compared against every arrival FlyerIntel has on file at RDU (179,931 flights), not just F91670’s own. More on taxi time.
Source: FlyerIntel analysis of US DOT BTS data · November 2023 – July 2026
The hour it leaves ATL
Part of any flight’s record belongs to the clock rather than to the flight. F91670 has one departure time, so this is what that time is worth.
On-time arrival rate. 72,288 departures from ATL are scheduled in the 10 PM–11 PM hour over the period, against 1,012,247 across the whole day.
F91670 is scheduled out of ATL at 10:44 PM, in the 10 PM–11 PM bank. Departures from ATL in that hour arrive on time 75.3% of the time against 78.7% across the airport’s whole day — the slot alone is worth 3.4 points worse before anything about this particular flight is considered.
The two airport figures cover every departure from ATL 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.
When it goes wrong
The average describes a usual day. This is the day that ruins a connection.
87 min late
against a median of 1 min late
F91670 has an average that understates its risk: a typical arrival is 1 min late, but the worst tenth are 86 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 654 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 |
|---|---|---|---|---|
| DL2634 | Delta Air Lines | 92.5% | 7 min early | 610 |
| DL2633 | Delta Air Lines | 90.6% | 7 min early | 820 |
| DL2026 | Delta Air Lines | 87.5% | 5 min early | 632 |
| DL2052 | Delta Air Lines | 84.3% | 5 min early | 750 |
| DL2600 | Delta Air Lines | 76.8% | 1 min early | 831 |
| DL1518 | Delta Air Lines | 76.4% | 3 min early | 954 |
| DL1097 | Delta Air Lines | 75.6% | 3 min early | 843 |
| F91670 this flight | Frontier Airlines | 62.2% | 1 min late | 654 |
Every departure listed carries at least 600 operations, so the comparison is between figures that mean something. F91670 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 654 records of F91670 operating ATL → RDU, 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
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