Flight number record

F9 1949

Frontier Airlines · Atlanta to San Francisco

Route: ATL → SFO
Departs: 18:55
Flights: 261
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s F9 1949, check with Frontier Airlines.

F9 1949 sits in the middle of the pack with a C. About seven flights in ten arrive on time by the DOT's definition, 9 points worse than the national rate of 77.6%. The late ones land a little over an hour behind schedule. That rests on 261 flights, with a median arrival 1 minute early.

The national on-time rate over the same period is 77.6%, so F9 1949 runs 9 points behind the country as a whole. Across a thousand flights that is about 90 extra late arrivals.

On time

68.6%

Arrivals under 15 minutes late, of 258 completed flights

Avg delay

71 min

Across delayed arrivals only, not all flights

Cancelled

1.15%

National rate is 1.81%

1 hour+ late

11.2%

National rate is 8.1%

These figures cover 261 flights between July 2025 and June 2026. Beyond the headline rate, 11.2% 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 1949 flies

F9 1949 flies ATL to SFO without a single fixed slot. Its most common scheduled departure was 18:55, used on 46 of 261 flights, with 19:05 (36 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 18:5546 flights17.6%
Departs 19:0536 flights13.8%

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 18:55 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.2%, and F9 1949 runs level with that at 68.6%. 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 1949 next to ATL to SFO

Every carrier on ATL to SFO combined arrived on time 71.4% of the time across 3,354 flights, so F9 1949 is 3 points behind it. Across its whole network Frontier Airlines managed 73.2%, which this flight trails by 5 points.

F9 1949 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
F9 1949thin sample	261	68.6%	71 min	1.15%	C
All Frontier Airlines on ATL–SFOthin sample	307	66.6%	71 min	1.30%	C
All carriers on ATL–SFO	3,354	71.4%	58 min	0.63%	C+
Frontier Airlines, whole network	205,332	73.2%	84 min	1.85%	C

Across the year

F9 1949 quarter by quarter

F9 1949 did not run the same all year. Its best quarter was Jan–Mar 2026 at 77.0% on time and its weakest Jul–Sep 2025 at 59.5%, a swing of 18 points on roughly 65 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 202579 flights59.5%
Oct–Dec 202568 flights66.2%
Jan–Mar 202664 flights77.0%
Apr–Jun 202650 flights76.0%

Scale runs 50% to 80%. Rows with fewer than 30 flights show a dash.

By weekday, F9 1949 did best on Thursday at 79.1% on time and worst on Sunday at 55.0%. Each day rests on about 37 flights, so a gap of 24 points is worth noticing but could still narrow in another year.

Delay causes

Why F9 1949 runs late

Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 5,756 reported delay minutes.

Late-arriving aircraft
41%
Carrier
29%
National Airspace System
28%
Extreme weather
2%

41% 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 5,756 reported delay minutes here, that single category outweighs weather by 25 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 5,756 delay minutes reported on F9 1949.

Cancellations sit at 1.15% against a national 1.81%, which is ordinary. Diversions add another 0.00%.

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. 11.2% 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 261 flights under F9 1949 in the data flew ATL to SFO. 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. 261 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 1949

For a booking, read F9 1949 as 68.6% on time with 1.15% cancelled over 261 flights. Those are rates from the past twelve months, not a forecast for any particular day.

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