Flight number record

F9 4372

Frontier Airlines · Santa Ana to Denver

Route: SNA → DEN
Departs: 12:01
Flights: 292
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s F9 4372, check with Frontier Airlines.

F9 4372 earns a B+. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 7 points better than the national rate of 77.6%. When something does go wrong the average delay runs an hour and a half. That rests on 292 flights, with a median arrival 9 minutes early.

Set against the rest of the country, F9 4372's record is 7 points better than the US average of 77.6%. That gap is worth roughly 73 fewer late arrivals for every thousand flights.

On time

84.9%

Arrivals under 15 minutes late, of 291 completed flights

Avg delay

91 min

Across delayed arrivals only, not all flights

Cancelled

0.34%

National rate is 1.81%

1 hour+ late

6.9%

National rate is 8.1%

These figures cover 292 flights between July 2025 and June 2026. The median arrival is 9 minutes early, which is the part an average hides: most flights here are fine, and the on-time rate is decided by a tail of badly late ones. On-time means under 15 minutes late, the DOT's own threshold.

Schedule

When F9 4372 flies

F9 4372 flies SNA to DEN without a single fixed slot. Its most common scheduled departure was 12:01, used on 52 of 292 flights, with 11:52 (31 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 12:0152 flights17.8%
Departs 11:5231 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 12:01 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.8%, and F9 4372 runs 6 points better at 84.9%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

F9 4372 next to SNA to DEN

Every carrier on SNA to DEN combined arrived on time 82.4% of the time across 3,697 flights, so F9 4372 is 3 points ahead of it. Across its whole network Frontier Airlines managed 73.2%, which this flight beats by 12 points.

F9 4372 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
F9 4372thin sample	292	84.9%	91 min	0.34%	B+
All Frontier Airlines on SNA–DENthin sample	292	84.9%	91 min	0.34%	B+
All carriers on SNA–DEN	3,697	82.4%	62 min	0.41%	B+
Frontier Airlines, whole network	205,332	73.2%	84 min	1.85%	C

Across the year

F9 4372 quarter by quarter

F9 4372 did not run the same all year. Its best quarter was Apr–Jun 2026 at 93.3% on time and its weakest Jul–Sep 2025 at 77.9%, a swing of 15 points on roughly 73 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 202586 flights77.9%
Oct–Dec 202586 flights88.2%
Jan–Mar 202660 flights81.7%
Apr–Jun 202660 flights93.3%

Scale runs 70% to 100%. Rows with fewer than 30 flights show a dash.

By weekday, F9 4372 ranged from 80.8% on Friday to 90.9% on Saturday. With about 42 flights behind each day, a spread of 10 points is inside normal variation, so the day you fly is not worth changing for this flight.

Delay causes

Why F9 4372 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 3,991 reported delay minutes.

Carrier
41%
Late-arriving aircraft
39%
National Airspace System
19%

39% 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 3,991 reported delay minutes here, that single category outweighs weather by 39 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 3,991 delay minutes reported on F9 4372.

Cancellations are rare at 0.34%, below the national 1.81% and low enough to earn the plus on the grade. Roughly one flight in 100 is called off; the risk here is arriving late, not not arriving.

Connections and routes

What a delay on this flight costs

6.9% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last an hour and a half, which a normal layover absorbs.

The 846 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. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.

Every one of the 292 flights under F9 4372 in the data flew SNA to DEN. 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. 292 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 4372

For a booking, read F9 4372 as 84.9% on time with 0.34% cancelled over 292 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