Flight number record

F9 4158

Frontier Airlines · San Francisco to Las Vegas

Route: SFO → LAS
Departs: 05:45
Flights: 282
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s F9 4158, check with Frontier Airlines.

F9 4158 sits in the middle of the pack with a C+. About seven flights in ten arrive on time by the DOT's definition, 5 points worse than the national rate of 77.6%. The late ones land an hour and a half behind schedule. That rests on 282 flights, with a median arrival 10 minutes early.

The national on-time rate over the same period is 77.6%, so F9 4158 runs 5 points behind the country as a whole. Across a thousand flights that is about 47 extra late arrivals.

On time

72.9%

Arrivals under 15 minutes late, of 280 completed flights

Avg delay

83 min

Across delayed arrivals only, not all flights

Cancelled

0.71%

National rate is 1.81%

1 hour+ late

10.4%

National rate is 8.1%

These figures cover 282 flights between July 2025 and June 2026. Beyond the headline rate, 10.4% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.

Schedule

When F9 4158 flies

F9 4158 flies SFO to LAS without a single fixed slot. Its most common scheduled departure was 05:45, used on 80 of 282 flights, with 08:00 (35 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 05:4580 flights28.4%
Departs 08:0035 flights12.4%

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 05:45 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and F9 4158 runs 16 points worse at 72.9%. 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 4158 next to SFO to LAS

Every carrier on SFO to LAS combined arrived on time 74.1% of the time across 6,066 flights, so F9 4158 is about level with it. Frontier flew 879 flights on the same city pair under all its flight numbers, including this one, and those ran 65.6% on time. Across its whole network Frontier Airlines managed 73.2%, close to this flight's figure.

F9 4158 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
F9 4158thin sample	282	72.9%	83 min	0.71%	C+
All Frontier Airlines on SFO–LAS	879	65.6%	96 min	1.25%	C
All carriers on SFO–LAS	6,066	74.1%	67 min	0.61%	C+
Frontier Airlines, whole network	205,332	73.2%	84 min	1.85%	C

Across the year

F9 4158 quarter by quarter

F9 4158 did not run the same all year. Its best quarter was Oct–Dec 2025 at 89.3% on time and its weakest Apr–Jun 2026 at 37.1%, a swing of 52 points on roughly 71 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 202592 flights89.0%
Oct–Dec 202575 flights89.3%
Jan–Mar 202652 flights63.5%
Apr–Jun 202663 flights37.1%

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

By weekday, F9 4158 did best on Saturday at 84.1% on time and worst on Thursday at 62.8%. Each day rests on about 40 flights, so a gap of 21 points is worth noticing but could still narrow in another year.

Delay causes

Why F9 4158 runs late

One category carries most of the weight here. Late-arriving aircraft accounts for 53% of the 6,283 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
53%
Carrier
33%
National Airspace System
13%
Extreme weather
1%

53% 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 6,283 reported delay minutes here, that single category outweighs weather by 53 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 6,283 delay minutes reported on F9 4158.

Cancellations are rare at 0.71%, 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

For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 10.4% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum here, and two hours if the onward flight is on a separate ticket.

Every one of the 282 flights under F9 4158 in the data flew SFO to LAS. 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. 282 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 4158

For a booking, read F9 4158 as 72.9% on time with 0.71% cancelled over 282 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