Flight number record

F9 3923

Frontier Airlines · Atlanta to Las Vegas

Route: ATL → LAS
Departs: 19:11
Flights: 277
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s F9 3923, check with Frontier Airlines.

F9 3923 draws a D. Roughly one flight in two arrives at least 15 minutes late, and the typical late arrival is an hour and a half behind schedule. Build slack into anything you connect to. That rests on 277 flights, with a median arrival 1 minute late.

The national on-time rate over the same period is 77.6%, so F9 3923 runs 18 points behind the country as a whole. Across a thousand flights that is about 184 extra late arrivals.

On time

59.2%

Arrivals under 15 minutes late, of 267 completed flights

Avg delay

95 min

Across delayed arrivals only, not all flights

Cancelled

2.53%

National rate is 1.81%

1 hour+ late

19.9%

National rate is 8.1%

These figures cover 277 flights between July 2025 and June 2026. Beyond the headline rate, 19.9% 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 3923 flies

F9 3923 flies ATL to LAS without a single fixed slot. Its most common scheduled departure was 19:11, used on 56 of 277 flights, with 20:50 (36 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 19:1156 flights20.2%
Departs 20:5036 flights13.0%

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 19:11 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.2%, and F9 3923 runs 9 points worse at 59.2%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.

Against the route

F9 3923 next to ATL to LAS

Every carrier on ATL to LAS combined arrived on time 75.9% of the time across 4,796 flights, so F9 3923 is 17 points behind it. Frontier flew 562 flights on the same city pair under all its flight numbers, including this one, and those ran 63.3% on time. Across its whole network Frontier Airlines managed 73.2%, which this flight trails by 14 points.

F9 3923 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
F9 3923thin sample	277	59.2%	95 min	2.53%	D
All Frontier Airlines on ATL–LAS	562	63.3%	88 min	2.31%	D
All carriers on ATL–LAS	4,796	75.9%	60 min	0.77%	B+
Frontier Airlines, whole network	205,332	73.2%	84 min	1.85%	C

Across the year

F9 3923 quarter by quarter

Quarter by quarter F9 3923 held fairly steady: 52.9% in Jul–Sep 2025, 62.5% in Oct–Dec 2025, 60.3% in Jan–Mar 2026 and 59.5% in Apr–Jun 2026. A spread of 10 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202553 flights52.9%
Oct–Dec 202565 flights62.5%
Jan–Mar 202682 flights60.3%
Apr–Jun 202677 flights59.5%

Scale runs 45% to 70%. Rows with fewer than 30 flights show a dash.

By weekday, F9 3923 did best on Sunday at 64.3% on time and worst on Monday at 46.9%. Each day rests on about 40 flights, so a gap of 17 points is worth noticing but could still narrow in another year.

Delay causes

Why F9 3923 runs late

One category carries most of the weight here. Late-arriving aircraft accounts for 57% of the 10,000 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
57%
Carrier
35%
National Airspace System
8%
Extreme weather
1%

57% 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 10,000 reported delay minutes here, that single category outweighs weather by 57 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 10,347 delay minutes reported on F9 3923.

Cancellations run at 2.53%, against 1.81% nationally. That is about one flight in 40 cancelled outright. A cancelled flight is invisible in every on-time figure on this page, so the punctuality numbers above describe only the flights that actually operated.

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. 19.9% 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.

At 1,747 miles this is transcontinental flying, and long routes get a quiet structural advantage. Scheduled block time on a flight this length carries more padding in absolute minutes, so a twenty-minute late departure often still becomes an on-time arrival. Read the on-time rate here as slightly flattering next to a short-haul route with the same operational quality.

Every one of the 277 flights under F9 3923 in the data flew ATL 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. 277 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 3923

For a booking, the cancellation rate is the figure to plan around on F9 3923: 2.53% of its 277 scheduled flights did not operate. A late arrival costs an hour and a half, but a cancellation costs the day, so leave a later option open.

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