Flight number record

F9 4401

Frontier Airlines · Las Vegas to San Francisco

Route: LAS → SFO
Departs: 19:33
Flights: 330
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s F9 4401, check with Frontier Airlines.

F9 4401 earns an F, which is as low as this site's scale goes for a reason. Only 52.5% of flights arrive inside the 15-minute window, 25 points worse than the national rate of 77.6%. Late arrivals average a little over an hour. Treat any tight connection here as a coin flip. That rests on 330 flights, with a median arrival 11 minutes late.

The national on-time rate over the same period is 77.6%, so F9 4401 runs 25 points behind the country as a whole. Across a thousand flights that is about 251 extra late arrivals.

On time

52.5%

Arrivals under 15 minutes late, of 324 completed flights

Avg delay

77 min

Across delayed arrivals only, not all flights

Cancelled

1.82%

National rate is 1.81%

1 hour+ late

20.4%

National rate is 8.1%

These figures cover 330 flights between July 2025 and June 2026. Beyond the headline rate, 20.4% 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 4401 flies

F9 4401 flies LAS to SFO without a single fixed slot. Its most common scheduled departure was 19:33, used on 82 of 330 flights, with 19:30 (35 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 19:3382 flights24.8%
Departs 19:3035 flights10.6%

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 19:33 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.2%, and F9 4401 runs 16 points worse at 52.5%. 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 4401 next to LAS to SFO

Every carrier on LAS to SFO combined arrived on time 62.8% of the time across 6,060 flights, so F9 4401 is 10 points behind it. Frontier flew 875 flights on the same city pair under all its flight numbers, including this one, and those ran 64.3% on time. Across its whole network Frontier Airlines managed 73.2%, which this flight trails by 21 points.

F9 4401 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
F9 4401thin sample	330	52.5%	77 min	1.82%	F
All Frontier Airlines on LAS–SFO	875	64.3%	70 min	1.37%	D
All carriers on LAS–SFO	6,060	62.8%	59 min	0.68%	D+
Frontier Airlines, whole network	205,332	73.2%	84 min	1.85%	C

Across the year

F9 4401 quarter by quarter

F9 4401 did not run the same all year. Its best quarter was Jan–Mar 2026 at 79.0% on time and its weakest Oct–Dec 2025 at 42.2%, a swing of 37 points on roughly 83 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 202592 flights52.7%
Oct–Dec 202584 flights42.2%
Jan–Mar 202666 flights79.0%
Apr–Jun 202688 flights43.2%

Scale runs 35% to 85%. Rows with fewer than 30 flights show a dash.

By weekday, F9 4401 did best on Saturday at 76.7% on time and worst on Friday at 45.1%. Each day rests on about 47 flights, so a gap of 32 points is worth noticing but could still narrow in another year.

Delay causes

Why F9 4401 runs late

One category carries most of the weight here. National Airspace System accounts for 52% of the 12,000 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.

National Airspace System
52%
Late-arriving aircraft
35%
Carrier
13%

35% 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 12,000 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 11,863 delay minutes reported on F9 4401.

Cancellations sit at 1.82% 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. 20.4% 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.

Every one of the 330 flights under F9 4401 in the data flew LAS 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. 330 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 4401

For a booking, F9 4401 is a flight to put a long connection behind. 20.4% of its completed flights arrived an hour or more late, which a short layover will not absorb. If the onward flight is on a separate ticket, the risk sits with you.

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