Flight number record
F9 3540
Frontier Airlines · Las Vegas to Denver
- Route
- LAS → DEN
- Departs
- 14:53
- Flights
- 260
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s F9 3540, check with Frontier Airlines.
F9 3540 draws a D. Roughly one flight in three arrives at least 15 minutes late, and the typical late arrival is about 2.3 hours behind schedule. Build slack into anything you connect to. That rests on 260 flights, with a median arrival 2 minutes late.
The national on-time rate over the same period is 77.3%, so F9 3540 runs 14 points behind the country as a whole. Across a thousand flights that is about 143 extra late arrivals.
Key figures
On time
63.0%
Arrivals under 15 minutes late, of 257 completed flights
Avg delay
137 min
Across delayed arrivals only, not all flights
Cancelled
1.15%
National rate is 1.89%
1 hour+ late
21.8%
National rate is 8.3%
These figures cover 260 flights between September 2025 and August 2026. Beyond the headline rate, 21.8% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When F9 3540 flies
F9 3540 flies LAS to DEN without a single fixed slot. Its most common scheduled departure was 14:53, used on 84 of 260 flights, with 14:49 (35 flights) next.
- Departs 14:5384 flights32.3%
- Departs 14:4935 flights13.5%
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 14:53 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 71.9%, and F9 3540 runs 9 points worse at 63.0%. 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 3540 next to LAS to DEN
Every carrier on LAS to DEN combined arrived on time 76.5% of the time across 7,140 flights, so F9 3540 is 14 points behind it. Frontier flew 1,620 flights on the same city pair under all its flight numbers, including this one, and those ran 76.5% on time. Across its whole network Frontier Airlines managed 72.7%, which this flight trails by 10 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| F9 3540thin sample | 260 | 63.0% | 137 min | 1.15% | D |
| All Frontier Airlines on LAS–DEN | 1,620 | 76.5% | 96 min | 1.17% | B |
| All carriers on LAS–DEN | 7,140 | 76.5% | 69 min | 0.83% | B+ |
| Frontier Airlines, whole network | 213,022 | 72.7% | 84 min | 2.05% | C |
Across the year
F9 3540 quarter by quarter
F9 3540 did not run the same all year. Its best quarter was Jan–Mar 2026 at 78.9% on time and its weakest Jul–Sep 2026 at 38.3%, a swing of 41 points on roughly 65 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 202517 flights—
- Oct–Dec 202535 flights65.7%
- Jan–Mar 202658 flights78.9%
- Apr–Jun 202688 flights70.5%
- Jul–Sep 202662 flights38.3%
Scale runs 30% to 85%. Rows with fewer than 30 flights show a dash.
By weekday, F9 3540 did best on Saturday at 77.8% on time and worst on Friday at 52.5%. Each day rests on about 37 flights, so a gap of 25 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late F9 3540 runs when it is late
F9 3540 often beats the schedule: 73 of 257 completed flights, 28%, arrived 15 minutes or more early. When F9 3540 is late it tends to be very late: 56 of its 95 late arrivals were an hour or more behind, and 33 were two hours or more.
- 15+ min early73 flights28.4%
- Within 15 min89 flights34.6%
- 15–29 min late14 flights5.4%
- 30–59 min late25 flights9.7%
- 1–2 hours late23 flights8.9%
- 2+ hours late33 flights12.8%
Scale runs 0% to 100%.
Share of 257 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 88 departures that left 15 minutes late or more, only 8 made it up before arrival. In the other direction, 15 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at DEN.
The worst days
Worst days for F9 3540
The latest arrival of the period was on 1 June 2026, 14 hours 41 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). Three of the five worst days fell in August 2026.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 1 June 2026 | 14 hours 41 minutes | Carrier |
| 3 August 2026 | 8 hours 58 minutes | National Airspace System |
| 13 November 2025 | 8 hours 50 minutes | Late-arriving aircraft |
| 14 August 2026 | 8 hours 44 minutes | National Airspace System |
| 2 August 2026 | 8 hours 6 minutes | Carrier |
Delay causes
Why F9 3540 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 13,000 reported delay minutes.
- 41%Late-arriving aircraft
- 38%National Airspace System
- 20%Carrier
- 1%Extreme weather
41% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 13,000 reported delay minutes here, that single category outweighs weather by 41 to one. The split is drawn from 12,963 delay minutes reported on F9 3540.
Cancellations sit at 1.15% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
21.8% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection here, and two hours if the onward flight is on a separate ticket.
The 628 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 260 flights under F9 3540 in the data flew LAS 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. 260 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 3540
For a booking, F9 3540 is a flight to put a long connection behind. 21.8% 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.
Related
Where to go next
- LAS to DEN, every carrier and departure
- DEN to LAS, the return direction
- United Airlines 596 on the same route97.8%
- Frontier Airlines 1994 on the same route77.4%
- Frontier Airlines 2350 on the same route88.4%
- United Airlines 2108 on the same route70.1%
- Frontier Airlines 4612 on the same route72.3%
- Harry Reid International (LAS) 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.