Flight number record

F9 3156

Frontier Airlines · Los Angeles to Denver

Route: LAX → DEN
Departs: 06:15
Flights: 361
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 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 11 points better than the national rate of 77.6%. When something does go wrong the average delay runs a little over an hour. That rests on 361 flights, with a median arrival 10 minutes early.

Set against the rest of the country, F9 3156's record is 11 points better than the US average of 77.6%. That gap is worth roughly 105 fewer late arrivals for every thousand flights.

On time

88.1%

Arrivals under 15 minutes late, of 360 completed flights

Avg delay

80 min

Across delayed arrivals only, not all flights

Cancelled

0.28%

National rate is 1.81%

1 hour+ late

4.7%

National rate is 8.1%

These figures cover 361 flights between July 2025 and June 2026. The median arrival is 10 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 3156 flies

F9 3156 flies LAX to DEN without a single fixed slot. Its most common scheduled departure was 06:15, used on 102 of 361 flights, with 06:30 (76 flights) and 06:44 (38 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 06:15102 flights28.3%
Departs 06:3076 flights21.1%
Departs 06:4438 flights10.5%

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 06:15 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 88.1%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.

Against the route

F9 3156 next to LAX to DEN

Every carrier on LAX to DEN combined arrived on time 81.7% of the time across 7,721 flights, so F9 3156 is 6 points ahead of it. Frontier flew 762 flights on the same city pair under all its flight numbers, including this one, and those ran 81.9% on time. Across its whole network Frontier Airlines managed 73.2%, which this flight beats by 15 points.

F9 3156 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
F9 3156thin sample	361	88.1%	80 min	0.28%	A+
All Frontier Airlines on LAX–DEN	762	81.9%	90 min	0.79%	B+
All carriers on LAX–DEN	7,721	81.7%	65 min	0.51%	B+
Frontier Airlines, whole network	205,332	73.2%	84 min	1.85%	C

Across the year

F9 3156 quarter by quarter

Quarter by quarter F9 3156 held fairly steady: 84.6% in Jul–Sep 2025, 88.6% in Oct–Dec 2025, 88.9% in Jan–Mar 2026 and 90.1% in Apr–Jun 2026. A spread of 6 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202592 flights84.6%
Oct–Dec 202588 flights88.6%
Jan–Mar 202690 flights88.9%
Apr–Jun 202691 flights90.1%

Scale runs 75% to 95%. Rows with fewer than 30 flights show a dash.

By weekday, F9 3156 did best on Friday at 94.2% on time and worst on Saturday at 77.1%. Each day rests on about 52 flights, so a gap of 17 points is worth noticing but could still narrow in another year.

Delay causes

Why F9 3156 runs late

One category carries most of the weight here. Late-arriving aircraft accounts for 45% of the 3,430 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.

Late-arriving aircraft
45%
Carrier
32%
National Airspace System
22%
Extreme weather
1%

45% 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 3,430 reported delay minutes here, that single category outweighs weather by 44 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 3,430 delay minutes reported on F9 3156.

Cancellations are rare at 0.28%, 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

Badly late arrivals are rare here: only 4.7% land an hour or more behind schedule, against 8.1% 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. 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 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: 88.1% on time and 0.28% cancelled. That is a base rate, not a promise about any single 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