Flight number record

F9 1448

Frontier Airlines · San Francisco to Atlanta

Route: SFO → ATL
Departs: 22:29
Flights: 306
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s F9 1448, check with Frontier Airlines.

F9 1448 draws a D−. Roughly one flight in two 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 306 flights, with a median arrival 7 minutes late.

The national on-time rate over the same period is 77.6%, so F9 1448 runs 18 points behind the country as a whole. Across a thousand flights that is about 179 extra late arrivals.

On time

59.7%

Arrivals under 15 minutes late, of 295 completed flights

Avg delay

72 min

Across delayed arrivals only, not all flights

Cancelled

3.27%

National rate is 1.81%

1 hour+ late

14.9%

National rate is 8.1%

These figures cover 306 flights between July 2025 and June 2026. Beyond the headline rate, 14.9% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.

Schedule

When F9 1448 flies

F9 1448 flies SFO to ATL without a single fixed slot. Its most common scheduled departure was 22:29, used on 51 of 306 flights, with 22:38 (39 flights) and 22:23 (36 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 22:2951 flights16.7%
Departs 22:3839 flights12.7%
Departs 22:2336 flights11.8%

Scale runs 0% to 100%. Rows with fewer than 30 flights show a dash.

Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.

A 22:29 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.5%, and F9 1448 runs 11 points worse at 59.7%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.

Against the route

F9 1448 next to SFO to ATL

Every carrier on SFO to ATL combined arrived on time 81.6% of the time across 3,350 flights, so F9 1448 is 22 points behind it. Across its whole network Frontier Airlines managed 73.2%, which this flight trails by 14 points.

F9 1448 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
F9 1448thin sample	306	59.7%	72 min	3.27%	D−
All Frontier Airlines on SFO–ATLthin sample	306	59.7%	72 min	3.27%	D−
All carriers on SFO–ATL	3,350	81.6%	67 min	0.81%	B+
Frontier Airlines, whole network	205,332	73.2%	84 min	1.85%	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 2025 at 50.6%, a swing of 20 points on roughly 77 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 202578 flights50.6%
Oct–Dec 202570 flights66.2%
Jan–Mar 202667 flights71.0%
Apr–Jun 202691 flights54.5%

Scale runs 40% to 75%. Rows with fewer than 30 flights show a dash.

By weekday, F9 1448 did best on Saturday at 68.8% on time and worst on Friday at 44.7%. Each day rests on about 44 flights, so a gap of 24 points is worth noticing but could still narrow in another year.

Delay causes

Why F9 1448 runs late

One category carries most of the weight here. Late-arriving aircraft accounts for 61% of the 8,601 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.

Late-arriving aircraft
61%
Carrier
28%
National Airspace System
8%
Extreme weather
2%

61% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 8,601 reported delay minutes here, that single category outweighs weather by 35 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 8,601 delay minutes reported on F9 1448.

Cancellations run at 3.27%, against 1.81% 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

For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 14.9% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum 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 306 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. 306 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: 3.27% of its 306 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.

Where to go next

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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.

Key figures