Flight number record

F9 3375

Frontier Airlines · Kansas City to Denver

Route: MCI → DEN
Departs: 14:34
Flights: 255
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s F9 3375, check with Frontier Airlines.

F9 3375 lands a B+, 2 points worse than the national rate of 77.6%. About one flight in four arrives 15 minutes late or worse, and those flights are late by close to two hours on average. That is a workable record, not a spotless one. That rests on 255 flights, with a median arrival 8 minutes early.

On time

76.0%

Arrivals under 15 minutes late, of 254 completed flights

Avg delay

122 min

Across delayed arrivals only, not all flights

Cancelled

0.39%

National rate is 1.81%

1 hour+ late

13.8%

National rate is 8.1%

These figures cover 255 flights between July 2025 and June 2026. Beyond the headline rate, 13.8% 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 3375 flies

F9 3375 flies MCI to DEN without a single fixed slot. Its most common scheduled departure was 14:34, used on 35 of 255 flights, with 20:28 (27 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 14:3435 flights13.7%
Departs 20:2827 flights10.6%

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 14:34 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 72.4%, and F9 3375 runs 4 points better at 76.0%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

F9 3375 next to MCI to DEN

Every carrier on MCI to DEN combined arrived on time 76.1% of the time across 4,274 flights, so F9 3375 is about level with it. Across its whole network Frontier Airlines managed 73.2%, which this flight beats by 3 points.

F9 3375 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
F9 3375thin sample	255	76.0%	122 min	0.39%	B+
All Frontier Airlines on MCI–DENthin sample	261	75.8%	119 min	0.38%	B+
All carriers on MCI–DEN	4,274	76.1%	65 min	0.61%	B+
Frontier Airlines, whole network	205,332	73.2%	84 min	1.85%	C

Across the year

F9 3375 quarter by quarter

F9 3375 did not run the same all year. Its best quarter was Oct–Dec 2025 at 81.4% on time and its weakest Jul–Sep 2025 at 57.8%, a swing of 24 points on roughly 64 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 202545 flights57.8%
Oct–Dec 202570 flights81.4%
Jan–Mar 202657 flights80.4%
Apr–Jun 202683 flights78.3%

Scale runs 50% to 85%. Rows with fewer than 30 flights show a dash.

By weekday, F9 3375 did best on Thursday at 83.8% on time and worst on Monday at 63.5%. Each day rests on about 36 flights, so a gap of 20 points is worth noticing but could still narrow in another year.

Delay causes

Why F9 3375 runs late

One category carries most of the weight here. Late-arriving aircraft accounts for 55% of the 7,438 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
55%
Carrier
25%
National Airspace System
20%
Extreme weather
1%

55% 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 7,438 reported delay minutes here, that single category outweighs weather by 55 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 7,438 delay minutes reported on F9 3375.

Cancellations are rare at 0.39%, 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. 13.8% 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.

The 533 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 255 flights under F9 3375 in the data flew MCI 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. 255 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 3375

For a booking, F9 3375 is a flight to put a long connection behind. 13.8% 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.

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