Flight number record
F9 2291
Frontier Airlines · Atlanta to Chicago
- Route
- ATL → MDW
- Departs
- 20:59
- Flights
- 299
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s F9 2291, check with Frontier Airlines.
F9 2291 draws a D. About one flight in three arrives at least 15 minutes late, and the typical late arrival is an hour and a half behind schedule. Build slack into anything you connect to. That rests on 299 flights, with a median arrival right on schedule.
The national on-time rate over the same period is 77.3%, so F9 2291 runs 13 points behind the country as a whole. Across a thousand flights that is about 128 extra late arrivals.
Key figures
On time
64.5%
Arrivals under 15 minutes late, of 290 completed flights
Avg delay
88 min
Across delayed arrivals only, not all flights
Cancelled
2.68%
National rate is 1.89%
1 hour+ late
14.8%
National rate is 8.3%
These figures cover 299 flights between September 2025 and August 2026. Beyond the headline rate, 14.8% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When F9 2291 flies
F9 2291 flies ATL to MDW without a single fixed slot. Its most common scheduled departure was 20:59, used on 44 of 299 flights.
- Departs 20:5944 flights14.7%
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 20:59 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.1%, and F9 2291 runs 6 points worse at 64.5%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
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Against the route
F9 2291 next to ATL to MDW
Every carrier on ATL to MDW combined arrived on time 75.2% of the time across 3,537 flights, so F9 2291 is 11 points behind it. Frontier flew 640 flights on the same city pair under all its flight numbers, including this one, and those ran 64.8% on time. Across its whole network Frontier Airlines managed 72.7%, which this flight trails by 8 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| F9 2291thin sample | 299 | 64.5% | 88 min | 2.68% | D |
| All Frontier Airlines on ATL–MDW | 640 | 64.8% | 89 min | 2.50% | D |
| All carriers on ATL–MDW | 3,537 | 75.2% | 67 min | 2.04% | B |
| Frontier Airlines, whole network | 213,022 | 72.7% | 84 min | 2.05% | C |
Across the year
F9 2291 quarter by quarter
F9 2291 did not run the same all year. Its best quarter was Jan–Mar 2026 at 71.6% on time and its weakest Jul–Sep 2026 at 42.1%, a swing of 29 points on roughly 75 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 202526 flights—
- Oct–Dec 202552 flights67.3%
- Jan–Mar 202670 flights71.6%
- Apr–Jun 202689 flights64.8%
- Jul–Sep 202662 flights42.1%
Scale runs 35% to 75%. Rows with fewer than 30 flights show a dash.
By weekday, F9 2291 ranged from 59.1% on Friday to 69.8% on Thursday. With about 43 flights behind each day, a spread of 11 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late F9 2291 runs when it is late
The 103 late arrivals split 22 under half an hour, 38 between 30 and 60 minutes, and 43 an hour or more.
- 15+ min early61 flights21.0%
- Within 15 min126 flights43.4%
- 15–29 min late22 flights7.6%
- 30–59 min late38 flights13.1%
- 1–2 hours late22 flights7.6%
- 2+ hours late21 flights7.2%
Scale runs 0% to 100%.
Share of 290 completed flights by arrival against schedule.
18 of 117 late departures made up the time and arrived on time, 15% of them. Only 4 left on time and still arrived late.
The worst days
Worst days for F9 2291
The latest arrival of the period was on 24 February 2026, 19 hours 56 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 |
|---|---|---|
| 24 February 2026 | 19 hours 56 minutes | Late-arriving aircraft |
| 10 March 2026 | 10 hours 14 minutes | National Airspace System |
| 29 November 2025 | 5 hours 10 minutes | National Airspace System |
| 24 May 2026 | 4 hours 18 minutes | Late-arriving aircraft |
| 2 August 2026 | 4 hours 6 minutes | Late-arriving aircraft |
Delay causes
Why F9 2291 runs late
Late-arriving aircraft accounts for 62% of the 9,087 delay minutes carriers reported here, and the remaining four split what is left.
- 62%Late-arriving aircraft
- 21%Carrier
- 17%National Airspace System
62% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 9,087 reported delay minutes here, that single category outweighs weather by 62 to one. The split is drawn from 9,087 delay minutes reported on F9 2291.
Cancellations run at 2.68%, against 1.89% nationally. That is about one flight in 40 cancelled outright. A cancelled flight is invisible in every on-time figure on this page, so the punctuality numbers above describe only the flights that actually operated.
Connections and routes
What a delay on this flight costs
14.8% 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 591 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 299 flights under F9 2291 in the data flew ATL to MDW. 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. 299 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 2291
For a booking, the cancellation rate is the figure to plan around on F9 2291: 2.68% of its 299 scheduled flights did not operate. A late arrival costs an hour and a half, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- ATL to MDW, every carrier and departure
- MDW to ATL, the return direction
- Delta Air Lines 1063 on the same route85.6%
- Delta Air Lines 1076 on the same route77.1%
- Frontier Airlines 2779 on the same route64.5%
- Delta Air Lines 2417 on the same route87.3%
- Hartsfield-Jackson Atlanta International (ATL) delay statistics
- Chicago Midway International (MDW) 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.