Flight number record

F9 1821

Frontier Airlines · Cleveland to Las Vegas

Route: CLE → LAS
Departs: 16:44
Flights: 322
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s F9 1821, check with Frontier Airlines.

F9 1821 sits in the middle of the pack with a B+. Close to three flights in four arrive on time by the DOT's definition, 2 points worse than the national rate of 77.6%. The late ones land an hour and a half behind schedule. That rests on 322 flights, with a median arrival 7 minutes early.

On time

75.2%

Arrivals under 15 minutes late, of 319 completed flights

Avg delay

94 min

Across delayed arrivals only, not all flights

Cancelled

0.62%

National rate is 1.81%

1 hour+ late

11.6%

National rate is 8.1%

These figures cover 322 flights between July 2025 and June 2026. Beyond the headline rate, 11.6% 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 1821 flies

F9 1821 flies CLE to LAS without a single fixed slot. Its most common scheduled departure was 16:44, used on 40 of 322 flights, with 20:50 (33 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 16:4440 flights12.4%
Departs 20:5033 flights10.2%

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 16:44 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 72.4%, and F9 1821 runs 3 points better at 75.2%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

F9 1821 next to CLE to LAS

Every carrier on CLE to LAS combined arrived on time 77.9% of the time across 981 flights, so F9 1821 is 3 points behind it. Frontier flew 609 flights on the same city pair under all its flight numbers, including this one, and those ran 76.3% on time. Across its whole network Frontier Airlines managed 73.2%, which this flight beats by 2 points.

F9 1821 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
F9 1821thin sample	322	75.2%	94 min	0.62%	B+
All Frontier Airlines on CLE–LAS	609	76.3%	90 min	1.31%	B
All carriers on CLE–LAS	981	77.9%	78 min	1.02%	B
Frontier Airlines, whole network	205,332	73.2%	84 min	1.85%	C

Across the year

F9 1821 quarter by quarter

F9 1821 did not run the same all year. Its best quarter was Jul–Sep 2025 at 84.6% on time and its weakest Jan–Mar 2026 at 61.2%, a swing of 23 points on roughly 81 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 flights84.6%
Oct–Dec 202571 flights74.6%
Jan–Mar 202668 flights61.2%
Apr–Jun 202691 flights76.7%

Scale runs 55% to 90%. Rows with fewer than 30 flights show a dash.

By weekday, F9 1821 did best on Wednesday at 85.4% on time and worst on Sunday at 63.8%. Each day rests on about 46 flights, so a gap of 22 points is worth noticing but could still narrow in another year.

Delay causes

Why F9 1821 runs late

One category carries most of the weight here. Late-arriving aircraft accounts for 54% of the 7,436 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
54%
Carrier
31%
National Airspace System
15%
Extreme weather
0%

54% 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 7,436 reported delay minutes here, that single category outweighs weather by 54 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 7,436 delay minutes reported on F9 1821.

Cancellations are rare at 0.62%, 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. 11.6% 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 1,824 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 322 flights under F9 1821 in the data flew CLE 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. 322 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 1821

For a booking, read F9 1821 as 75.2% on time with 0.62% cancelled over 322 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