Flight number record
F9 2779
Frontier Airlines · Atlanta to Chicago
- Route
- ATL → MDW
- Departs
- 21:15
- Flights
- 312
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s F9 2779, check with Frontier Airlines.
F9 2779 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 312 flights, with a median arrival 3 minutes late.
The national on-time rate over the same period is 77.3%, so F9 2779 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 301 completed flights
Avg delay
89 min
Across delayed arrivals only, not all flights
Cancelled
2.56%
National rate is 1.89%
1 hour+ late
16.6%
National rate is 8.3%
These figures cover 312 flights between September 2025 and August 2026. Beyond the headline rate, 16.6% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When F9 2779 flies
F9 2779 flies ATL to MDW without a single fixed slot. Its most common scheduled departure was 21:15, used on 57 of 312 flights, with 10:05 (50 flights) and 21:10 (36 flights) next.
- Departs 21:1557 flights18.3%
- Departs 10:0550 flights16.0%
- Departs 21:1036 flights11.5%
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 21:15 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.1%, and F9 2779 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 2779 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 2779 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 2779thin sample | 312 | 64.5% | 89 min | 2.56% | 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 2779 quarter by quarter
F9 2779 did not run the same all year. Its best quarter was Apr–Jun 2026 at 69.8% on time and its weakest Jan–Mar 2026 at 53.0%, a swing of 17 points on roughly 78 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 202521 flights—
- Oct–Dec 202570 flights60.9%
- Jan–Mar 202669 flights53.0%
- Apr–Jun 202690 flights69.8%
- Jul–Sep 202662 flights67.8%
Scale runs 45% to 75%. Rows with fewer than 30 flights show a dash.
By weekday, F9 2779 did best on Friday at 74.0% on time and worst on Monday at 50.0%. Each day rests on about 45 flights, so a gap of 24 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late F9 2779 runs when it is late
The 107 late arrivals split 25 under half an hour, 32 between 30 and 60 minutes, and 50 an hour or more.
- 15+ min early49 flights16.3%
- Within 15 min145 flights48.2%
- 15–29 min late25 flights8.3%
- 30–59 min late32 flights10.6%
- 1–2 hours late30 flights10.0%
- 2+ hours late20 flights6.6%
Scale runs 0% to 100%.
Share of 301 completed flights by arrival against schedule.
16 of 114 late departures made up the time and arrived on time, 14% of them. 9 flights left on time and still arrived late.
The worst days
Worst days for F9 2779
The latest arrival of the period was on 3 November 2025, 15 hours 47 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The five worst days are spread across November, March, October and May, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 3 November 2025 | 15 hours 47 minutes | Late-arriving aircraft |
| 6 March 2026 | 11 hours 39 minutes | Carrier |
| 27 October 2025 | 6 hours 54 minutes | Late-arriving aircraft |
| 11 May 2026 | 5 hours 24 minutes | Carrier |
| 29 November 2025 | 4 hours 11 minutes | National Airspace System |
Delay causes
Why F9 2779 runs late
Late-arriving aircraft accounts for 52% of the 9,569 delay minutes carriers reported here, and the remaining four split what is left.
- 52%Late-arriving aircraft
- 33%Carrier
- 14%National Airspace System
- 0%Extreme weather
52% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 9,569 reported delay minutes here, that single category outweighs weather by 52 to one. The split is drawn from 9,569 delay minutes reported on F9 2779.
Cancellations run at 2.56%, 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
16.6% 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 312 flights under F9 2779 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. 312 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 2779
For a booking, the cancellation rate is the figure to plan around on F9 2779: 2.56% of its 312 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 2291 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.