Flight number record
F9 3156
Frontier Airlines · Los Angeles to Denver
- Route
- LAX → DEN
- Departs
- 06:30
- Flights
- 361
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s F9 3156, check with Frontier Airlines.
F9 3156 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 12 points better than the national rate of 77.3%. When something does go wrong the average delay runs a little over an hour. That rests on 361 flights, with a median arrival 9 minutes early.
Set against the rest of the country, F9 3156's record is 12 points better than the US average of 77.3%. That gap is worth roughly 119 fewer late arrivals for every thousand flights.
Key figures
On time
89.2%
Arrivals under 15 minutes late, of 360 completed flights
Avg delay
71 min
Across delayed arrivals only, not all flights
Cancelled
0.28%
National rate is 1.89%
1 hour+ late
3.9%
National rate is 8.3%
These figures cover 361 flights between September 2025 and August 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.
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Schedule
When F9 3156 flies
F9 3156 flies LAX to DEN without a single fixed slot. Its most common scheduled departure was 06:30, used on 131 of 361 flights, with 06:15 (53 flights) and 06:44 (38 flights) next.
- Departs 06:30131 flights36.3%
- Departs 06:1553 flights14.7%
- Departs 06:4438 flights10.5%
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 06:30 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and F9 3156 runs level with that at 89.2%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
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Against the route
F9 3156 next to LAX to DEN
Every carrier on LAX to DEN combined arrived on time 81.6% of the time across 7,709 flights, so F9 3156 is 8 points ahead of it. Frontier flew 798 flights on the same city pair under all its flight numbers, including this one, and those ran 80.9% on time. Across its whole network Frontier Airlines managed 72.7%, which this flight beats by 17 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| F9 3156thin sample | 361 | 89.2% | 71 min | 0.28% | A+ |
| All Frontier Airlines on LAX–DEN | 798 | 80.9% | 87 min | 0.75% | B+ |
| All carriers on LAX–DEN | 7,709 | 81.6% | 68 min | 0.44% | B+ |
| Frontier Airlines, whole network | 213,022 | 72.7% | 84 min | 2.05% | C |
Across the year
F9 3156 quarter by quarter
Quarter by quarter F9 3156 held fairly steady: 83.3% in Jul–Sep 2025, 88.6% in Oct–Dec 2025, 88.9% in Jan–Mar 2026, 90.1% in Apr–Jun 2026 and 91.8% in Jul–Sep 2026. A spread of 9 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202530 flights83.3%
- Oct–Dec 202588 flights88.6%
- Jan–Mar 202690 flights88.9%
- Apr–Jun 202691 flights90.1%
- Jul–Sep 202662 flights91.8%
Scale runs 75% to 95%.
By weekday, F9 3156 did best on Sunday at 94.2% on time and worst on Saturday at 79.2%. Each day rests on about 52 flights, so a gap of 15 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late F9 3156 runs when it is late
F9 3156 often beats the schedule: 130 of 360 completed flights, 36%, arrived 15 minutes or more early. The 39 late arrivals split 16 under half an hour, 9 between 30 and 60 minutes, and 14 an hour or more.
- 15+ min early130 flights36.1%
- Within 15 min191 flights53.1%
- 15–29 min late16 flights4.4%
- 30–59 min late9 flights2.5%
- 1–2 hours late9 flights2.5%
- 2+ hours late5 flights1.4%
Scale runs 0% to 100%.
Share of 360 completed flights by arrival against schedule.
5 of 28 late departures made up the time and arrived on time, 18% of them. 16 flights left on time and still arrived late.
The worst days
Worst days for F9 3156
The latest arrival of the period was on 16 January 2026, 9 hours 51 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. On three of the five worst days the largest share was filed as carrier-caused (crew, maintenance, fuelling, baggage).
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 16 January 2026 | 9 hours 51 minutes | Late-arriving aircraft |
| 15 October 2025 | 3 hours 33 minutes | Carrier |
| 23 April 2026 | 2 hours 49 minutes | Late-arriving aircraft |
| 24 March 2026 | 2 hours 18 minutes | Carrier |
| 10 October 2025 | 2 hours | Carrier |
Delay causes
Why F9 3156 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 2,764 reported delay minutes.
- 38%Carrier
- 36%Late-arriving aircraft
- 25%National Airspace System
- 1%Extreme weather
36% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 2,764 reported delay minutes here, that single category outweighs weather by 28 to one. The split is drawn from 2,764 delay minutes reported on F9 3156.
Cancellations are rare at 0.28%, 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
Badly late arrivals are rare here: only 3.9% land an hour or more behind schedule, against 8.3% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.
The 862 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 361 flights under F9 3156 in the data flew LAX 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. 361 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 3156
For a booking, F9 3156 has one of the better records a US domestic flight can show: 89.2% on time and 0.28% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- LAX to DEN, every carrier and departure
- DEN to LAX, the return direction
- United Airlines 2146 on the same route77.4%
- United Airlines 1912 on the same route91.4%
- United Airlines 2610 on the same route90.7%
- Los Angeles International (LAX) 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.