Flight number record
F9 4372
Frontier Airlines · Santa Ana to Denver
- Route
- SNA → DEN
- Departs
- 11:52
- Flights
- 271
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s F9 4372, check with Frontier Airlines.
F9 4372 earns an A+. Close to nine flights in ten arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 11 points better than the national rate of 77.3%. When something does go wrong the average delay runs an hour and a half. That rests on 271 flights, with a median arrival 12 minutes early.
Set against the rest of the country, F9 4372's record is 11 points better than the US average of 77.3%. That gap is worth roughly 105 fewer late arrivals for every thousand flights.
Key figures
On time
87.8%
Arrivals under 15 minutes late, of 270 completed flights
Avg delay
99 min
Across delayed arrivals only, not all flights
Cancelled
0.37%
National rate is 1.89%
1 hour+ late
5.2%
National rate is 8.3%
These figures cover 271 flights between September 2025 and August 2026. The median arrival is 12 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.
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Schedule
When F9 4372 flies
F9 4372 flies SNA to DEN without a single fixed slot. Its most common scheduled departure was 11:52, used on 31 of 271 flights.
- Departs 11:5231 flights11.4%
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 11:52 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and F9 4372 runs 10 points better at 87.8%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
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Against the route
F9 4372 next to SNA to DEN
Every carrier on SNA to DEN combined arrived on time 83.4% of the time across 3,714 flights, so F9 4372 is 4 points ahead of it. Across its whole network Frontier Airlines managed 72.7%, which this flight beats by 15 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| F9 4372thin sample | 271 | 87.8% | 99 min | 0.37% | A+ |
| All Frontier Airlines on SNA–DENthin sample | 271 | 87.8% | 99 min | 0.37% | A+ |
| All carriers on SNA–DEN | 3,714 | 83.4% | 66 min | 0.30% | B+ |
| Frontier Airlines, whole network | 213,022 | 72.7% | 84 min | 2.05% | C |
Across the year
F9 4372 quarter by quarter
F9 4372 did not run the same all year. Its best quarter was Jul–Sep 2026 at 94.4% on time and its weakest Jan–Mar 2026 at 81.7%, a swing of 13 points on roughly 68 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 202529 flights—
- Oct–Dec 202586 flights88.2%
- Jan–Mar 202660 flights81.7%
- Apr–Jun 202660 flights93.3%
- Jul–Sep 202636 flights94.4%
Scale runs 75% to 100%. Rows with fewer than 30 flights show a dash.
By weekday, F9 4372 ranged from 87.5% on Thursday to 91.4% on Saturday. With about 39 flights behind each day, a spread of 4 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late F9 4372 runs when it is late
F9 4372 often beats the schedule: 111 of 270 completed flights, 41%, arrived 15 minutes or more early. The 33 late arrivals split 11 under half an hour, 8 between 30 and 60 minutes, and 14 an hour or more.
- 15+ min early111 flights41.1%
- Within 15 min126 flights46.7%
- 15–29 min late11 flights4.1%
- 30–59 min late8 flights3.0%
- 1–2 hours late9 flights3.3%
- 2+ hours late5 flights1.9%
Scale runs 0% to 100%.
Share of 270 completed flights by arrival against schedule.
9 of 32 late departures made up the time and arrived on time, 28% of them. 10 flights left on time and still arrived late.
The worst days
Worst days for F9 4372
The latest arrival of the period was on 30 January 2026, 21 hours 47 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 |
|---|---|---|
| 30 January 2026 | 21 hours 47 minutes | Carrier |
| 26 January 2026 | 4 hours 37 minutes | Late-arriving aircraft |
| 8 November 2025 | 2 hours 41 minutes | Carrier |
| 3 December 2025 | 2 hours 26 minutes | Late-arriving aircraft |
| 23 September 2025 | 2 hours 21 minutes | Late-arriving aircraft |
Delay causes
Why F9 4372 runs late
Carrier accounts for 49% of the 3,278 delay minutes carriers reported here, and the remaining four split what is left.
- 49%Carrier
- 33%Late-arriving aircraft
- 17%National Airspace System
The largest share of delay minutes, 49%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 1,620 of the 3,278 delay minutes reported here. The split is drawn from 3,278 delay minutes reported on F9 4372.
Cancellations are rare at 0.37%, below the national 1.89% 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
5.2% of arrivals land an hour or more late, close to the national 8.3%, so 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.
Every one of the 271 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. 271 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, F9 4372 has one of the better records a US domestic flight can show: 87.8% on time and 0.37% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- SNA to DEN, every carrier and departure
- DEN to SNA, the return direction
- United Airlines 2656 on the same route86.0%
- John Wayne Airport (SNA) delay statistics
- Denver International (DEN) 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.