Flight number record
F9 4211
Frontier Airlines · Atlanta to Austin
- Route
- ATL → AUS
- Departs
- 15:10
- Flights
- 279
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s F9 4211, check with Frontier Airlines.
F9 4211 draws a C. About one flight in three arrives at least 15 minutes late, and the typical late arrival is a little over an hour behind schedule. Build slack into anything you connect to. That rests on 279 flights, with a median arrival right on schedule.
The national on-time rate over the same period is 77.3%, so F9 4211 runs 11 points behind the country as a whole. Across a thousand flights that is about 111 extra late arrivals.
Key figures
On time
66.2%
Arrivals under 15 minutes late, of 275 completed flights
Avg delay
75 min
Across delayed arrivals only, not all flights
Cancelled
1.43%
National rate is 1.89%
1 hour+ late
11.3%
National rate is 8.3%
These figures cover 279 flights between September 2025 and August 2026. Beyond the headline rate, 11.3% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When F9 4211 flies
F9 4211 flies ATL to AUS without a single fixed slot. Its most common scheduled departure was 15:10, used on 58 of 279 flights, with 11:11 (35 flights) next.
- Departs 15:1058 flights20.8%
- Departs 11:1135 flights12.5%
Scale runs 0% to 100%.
Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.
A 15:10 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 71.9%, and F9 4211 runs 6 points worse at 66.2%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
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Against the route
F9 4211 next to ATL to AUS
Every carrier on ATL to AUS combined arrived on time 81.0% of the time across 4,497 flights, so F9 4211 is 15 points behind it. Across its whole network Frontier Airlines managed 72.7%, which this flight trails by 7 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| F9 4211thin sample | 279 | 66.2% | 75 min | 1.43% | C |
| All Frontier Airlines on ATL–AUSthin sample | 295 | 66.7% | 77 min | 1.36% | C |
| All carriers on ATL–AUS | 4,497 | 81.0% | 59 min | 1.27% | B |
| Frontier Airlines, whole network | 213,022 | 72.7% | 84 min | 2.05% | C |
Across the year
F9 4211 quarter by quarter
F9 4211 did not run the same all year. Its best quarter was Jan–Mar 2026 at 78.7% on time and its weakest Oct–Dec 2025 at 60.0%, a swing of 19 points on roughly 70 flights a quarter. The twelve-month rate averages over that, so if you are flying in a weak quarter the quarter's own figure is the better guide.
- Jul–Sep 202517 flights—
- Oct–Dec 202556 flights60.0%
- Jan–Mar 202662 flights78.7%
- Apr–Jun 202682 flights67.9%
- Jul–Sep 202662 flights60.7%
Scale runs 50% to 85%. Rows with fewer than 30 flights show a dash.
By weekday, F9 4211 did best on Thursday at 77.6% on time and worst on Monday at 54.9%. Each day rests on about 40 flights, so a gap of 23 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late F9 4211 runs when it is late
The 93 late arrivals split 28 under half an hour, 34 between 30 and 60 minutes, and 31 an hour or more.
- 15+ min early68 flights24.7%
- Within 15 min114 flights41.5%
- 15–29 min late28 flights10.2%
- 30–59 min late34 flights12.4%
- 1–2 hours late18 flights6.5%
- 2+ hours late13 flights4.7%
Scale runs 0% to 100%.
Share of 275 completed flights by arrival against schedule.
16 of 98 late departures made up the time and arrived on time, 16% of them. 11 flights left on time and still arrived late.
The worst days
Worst days for F9 4211
The latest arrival of the period was on 23 February 2026, 16 hours 35 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 23 February 2026 | 16 hours 35 minutes | Late-arriving aircraft |
| 21 July 2026 | 6 hours 30 minutes | Carrier |
| 14 June 2026 | 3 hours 54 minutes | Late-arriving aircraft |
| 17 August 2026 | 3 hours 37 minutes | Late-arriving aircraft |
| 7 March 2026 | 3 hours 32 minutes | Carrier |
Delay causes
Why F9 4211 runs late
Late-arriving aircraft accounts for 44% of the 7,015 delay minutes carriers reported here, and the remaining four split what is left.
- 44%Late-arriving aircraft
- 37%Carrier
- 18%National Airspace System
- 1%Extreme weather
44% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 7,015 reported delay minutes here, that single category outweighs weather by 44 to one. The split is drawn from 7,015 delay minutes reported on F9 4211.
Cancellations sit at 1.43% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
11.3% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection here, and two hours if the onward flight is on a separate ticket.
The 813 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty.
Every one of the 279 flights under F9 4211 in the data flew ATL to AUS. The number was not reused on any other city pair, which makes this a clean record of one route.
One caution: this is a thin sample. 279 flights over twelve months is enough to clear this site's floor but not enough to pin the rate down tightly, and a single bad week moves it by more than a point. Treat the grade as a rough reading.
What to do with this
Booking F9 4211
For a booking, F9 4211 is one of the weaker ways to fly ATL to AUS: 15 points below the route as a whole. If the schedule allows, compare it with the other departures listed on the route page before settling on this one.
Related
Where to go next
- ATL to AUS, every carrier and departure
- AUS to ATL, the return direction
- Delta Air Lines 2886 on the same route88.5%
- Delta Air Lines 1397 on the same route80.0%
- Delta Air Lines 2976 on the same route93.4%
- Delta Air Lines 1491 on the same route74.7%
- Delta Air Lines 2104 on the same route85.4%
- Delta Air Lines 1170 on the same route73.0%
- Hartsfield-Jackson Atlanta International (ATL) delay statistics
- Austin-Bergstrom International (AUS) delay statistics
- Frontier Airlines on-time record
- Every Frontier Airlines flight number with a record
- The most and least reliable flight numbers in the US
- Why the first flight of the morning is statistically safest
A flight number here means Frontier Airlines’s own number as it reports to the DOT. How the figures are computed is on the methodology page.
Source: US DOT Bureau of Transportation Statistics, on-time performance data, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.