Flight number record

F9 3229

Frontier Airlines · Houston to Denver

Route: IAH → DEN
Departs: 06:45
Flights: 356
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s F9 3229, check with Frontier Airlines.

F9 3229 earns an A+. Close to nine flights in ten arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 9 points better than the national rate of 77.6%. When something does go wrong the average delay runs close to two hours. That rests on 356 flights, with a median arrival 11 minutes early.

Set against the rest of the country, F9 3229's record is 9 points better than the US average of 77.6%. That gap is worth roughly 94 fewer late arrivals for every thousand flights.

On time

87.0%

Arrivals under 15 minutes late, of 355 completed flights

Avg delay

111 min

Across delayed arrivals only, not all flights

Cancelled

0.28%

National rate is 1.81%

1 hour+ late

5.6%

National rate is 8.1%

These figures cover 356 flights between July 2025 and June 2026. The median arrival is 11 minutes early, which is the part an average hides: most flights here are fine, and the on-time rate is decided by a tail of badly late ones. On-time means under 15 minutes late, the DOT's own threshold.

Schedule

When F9 3229 flies

F9 3229 flies IAH to DEN without a single fixed slot. Its most common scheduled departure was 06:45, used on 121 of 356 flights, with 06:00 (66 flights) and 06:30 (57 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 06:45121 flights34.0%
Departs 06:0066 flights18.5%
Departs 06:3057 flights16.0%

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 06:45 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and F9 3229 runs 2 points worse at 87.0%. 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 3229 next to IAH to DEN

Every carrier on IAH to DEN combined arrived on time 81.2% of the time across 4,673 flights, so F9 3229 is 6 points ahead of it. Frontier flew 798 flights on the same city pair under all its flight numbers, including this one, and those ran 79.8% on time. Across its whole network Frontier Airlines managed 73.2%, which this flight beats by 14 points.

F9 3229 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
F9 3229thin sample	356	87.0%	111 min	0.28%	A+
All Frontier Airlines on IAH–DEN	798	79.8%	78 min	0.38%	B+
All carriers on IAH–DEN	4,673	81.2%	70 min	0.24%	B+
Frontier Airlines, whole network	205,332	73.2%	84 min	1.85%	C

Across the year

F9 3229 quarter by quarter

Quarter by quarter F9 3229 held fairly steady: 89.1% in Jul–Sep 2025, 85.9% in Oct–Dec 2025, 87.5% in Jan–Mar 2026 and 85.7% in Apr–Jun 2026. A spread of 3 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202592 flights89.1%
Oct–Dec 202592 flights85.9%
Jan–Mar 202681 flights87.5%
Apr–Jun 202691 flights85.7%

Scale runs 75% to 95%. Rows with fewer than 30 flights show a dash.

By weekday, F9 3229 did best on Friday at 96.2% on time and worst on Monday at 80.8%. Each day rests on about 51 flights, so a gap of 15 points is worth noticing but could still narrow in another year.

Delay causes

Why F9 3229 runs late

One category carries most of the weight here. Carrier accounts for 60% of the 5,112 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.

Carrier
60%
Late-arriving aircraft
28%
National Airspace System
12%

The largest share of delay minutes, 60%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 3,088 of the 5,112 delay minutes reported here. The split is drawn from 5,112 delay minutes reported on F9 3229.

Cancellations are rare at 0.28%, 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

5.6% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last close to two hours, which a normal layover absorbs.

The 861 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 356 flights under F9 3229 in the data flew IAH 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. 356 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 3229

For a booking, F9 3229 has one of the better records a US domestic flight can show: 87.0% on time and 0.28% cancelled. That is a base rate, not a promise about any single 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