Flight number record
F9 1448
Frontier Airlines · San Francisco to Atlanta
- Route
- SFO → ATL
- Departs
- 22:10
- Flights
- 311
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s F9 1448, check with Frontier Airlines.
F9 1448 draws a D−. Roughly 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 311 flights, with a median arrival 6 minutes late.
The national on-time rate over the same period is 77.3%, so F9 1448 runs 16 points behind the country as a whole. Across a thousand flights that is about 161 extra late arrivals.
Key figures
On time
61.2%
Arrivals under 15 minutes late, of 299 completed flights
Avg delay
73 min
Across delayed arrivals only, not all flights
Cancelled
3.54%
National rate is 1.89%
1 hour+ late
14.4%
National rate is 8.3%
These figures cover 311 flights between September 2025 and August 2026. Beyond the headline rate, 14.4% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When F9 1448 flies
F9 1448 flies SFO to ATL without a single fixed slot. Its most common scheduled departure was 22:10, used on 47 of 311 flights, with 23:00 (44 flights) and 22:38 (39 flights) next.
- Departs 22:1047 flights15.1%
- Departs 23:0044 flights14.1%
- Departs 22:3839 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 22:10 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.1%, and F9 1448 runs 9 points worse at 61.2%. 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 1448 next to SFO to ATL
Every carrier on SFO to ATL combined arrived on time 80.2% of the time across 3,337 flights, so F9 1448 is 19 points behind it. Across its whole network Frontier Airlines managed 72.7%, which this flight trails by 12 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| F9 1448thin sample | 311 | 61.2% | 73 min | 3.54% | D− |
| All Frontier Airlines on SFO–ATLthin sample | 311 | 61.2% | 73 min | 3.54% | D− |
| All carriers on SFO–ATL | 3,337 | 80.2% | 68 min | 0.87% | B+ |
| Frontier Airlines, whole network | 213,022 | 72.7% | 84 min | 2.05% | C |
Across the year
F9 1448 quarter by quarter
F9 1448 did not run the same all year. Its best quarter was Jan–Mar 2026 at 71.0% on time and its weakest Jul–Sep 2026 at 53.3%, a swing of 18 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 flights66.2%
- Jan–Mar 202667 flights71.0%
- Apr–Jun 202691 flights54.5%
- Jul–Sep 202662 flights53.3%
Scale runs 45% to 75%. Rows with fewer than 30 flights show a dash.
By weekday, F9 1448 did best on Saturday at 72.9% on time and worst on Thursday at 49.0%. Each day rests on about 44 flights, so a gap of 24 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late F9 1448 runs when it is late
The 116 late arrivals split 30 under half an hour, 43 between 30 and 60 minutes, and 43 an hour or more.
- 15+ min early61 flights20.4%
- Within 15 min122 flights40.8%
- 15–29 min late30 flights10.0%
- 30–59 min late43 flights14.4%
- 1–2 hours late24 flights8.0%
- 2+ hours late19 flights6.4%
Scale runs 0% to 100%.
Share of 299 completed flights by arrival against schedule.
A late pushback is often recovered here: of 155 departures that left 15 minutes late or more, 49 still arrived on time. 10 flights left on time and still arrived late.
The worst days
Worst days for F9 1448
The latest arrival of the period was on 22 July 2026, 12 hours 6 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). On three of the five worst days the largest share was filed as a late-arriving aircraft.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 22 July 2026 | 12 hours 6 minutes | Carrier |
| 5 December 2025 | 11 hours 30 minutes | Late-arriving aircraft |
| 18 June 2026 | 3 hours 27 minutes | Late-arriving aircraft |
| 29 May 2026 | 2 hours 58 minutes | Late-arriving aircraft |
| 19 December 2025 | 2 hours 56 minutes | Carrier |
Delay causes
Why F9 1448 runs late
Late-arriving aircraft accounts for 63% of the 8,427 delay minutes carriers reported here, and the remaining four split what is left.
- 63%Late-arriving aircraft
- 28%Carrier
- 7%National Airspace System
- 2%Extreme weather
63% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 8,427 reported delay minutes here, that single category outweighs weather by 29 to one. The split is drawn from 8,427 delay minutes reported on F9 1448.
Cancellations run at 3.54%, against 1.89% nationally. That is about one flight in 30 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
14.4% 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.
At 2,139 miles this is transcontinental flying, and long routes get a quiet structural advantage. Scheduled block time on a flight this length carries more padding in absolute minutes, so a twenty-minute late departure often still becomes an on-time arrival. Read the on-time rate here as slightly flattering next to a short-haul route with the same operational quality.
Every one of the 311 flights under F9 1448 in the data flew SFO to ATL. 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. 311 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 1448
For a booking, the cancellation rate is the figure to plan around on F9 1448: 3.54% of its 311 scheduled flights did not operate. A late arrival costs a little over an hour, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- SFO to ATL, every carrier and departure
- ATL to SFO, the return direction
- Delta Air Lines 570 on the same route91.4%
- Delta Air Lines 640 on the same route89.5%
- San Francisco International (SFO) delay statistics
- Hartsfield-Jackson Atlanta International (ATL) 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.