Flight number record
F9 3229
Frontier Airlines · Houston to Denver
- Route
- IAH → DEN
- Departs
- 06:45
- Flights
- 356
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 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 10 points better than the national rate of 77.3%. When something does go wrong the average delay runs an hour and a half. That rests on 356 flights, with a median arrival 12 minutes early.
Set against the rest of the country, F9 3229's record is 10 points better than the US average of 77.3%. That gap is worth roughly 102 fewer late arrivals for every thousand flights.
Key figures
On time
87.5%
Arrivals under 15 minutes late, of 353 completed flights
Avg delay
97 min
Across delayed arrivals only, not all flights
Cancelled
0.84%
National rate is 1.89%
1 hour+ late
4.8%
National rate is 8.3%
These figures cover 356 flights between September 2025 and August 2026. The median arrival is 12 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.
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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 06:30 (119 flights) next.
- Departs 06:45121 flights34.0%
- Departs 06:30119 flights33.4%
Scale runs 0% to 100%.
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 level with that at 87.5%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
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Against the route
F9 3229 next to IAH to DEN
Every carrier on IAH to DEN combined arrived on time 83.0% of the time across 4,728 flights, so F9 3229 is 5 points ahead of it. Frontier flew 834 flights on the same city pair under all its flight numbers, including this one, and those ran 80.2% on time. Across its whole network Frontier Airlines managed 72.7%, which this flight beats by 15 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| F9 3229thin sample | 356 | 87.5% | 97 min | 0.84% | A+ |
| All Frontier Airlines on IAH–DEN | 834 | 80.2% | 76 min | 1.20% | B |
| All carriers on IAH–DEN | 4,728 | 83.0% | 69 min | 0.40% | B+ |
| Frontier Airlines, whole network | 213,022 | 72.7% | 84 min | 2.05% | C |
Across the year
F9 3229 quarter by quarter
Quarter by quarter F9 3229 held fairly steady: 86.7% in Jul–Sep 2025, 85.9% in Oct–Dec 2025, 87.5% in Jan–Mar 2026, 85.7% in Apr–Jun 2026 and 93.3% in Jul–Sep 2026. A spread of 8 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202530 flights86.7%
- Oct–Dec 202592 flights85.9%
- Jan–Mar 202681 flights87.5%
- Apr–Jun 202691 flights85.7%
- Jul–Sep 202662 flights93.3%
Scale runs 75% to 100%.
By weekday, F9 3229 ranged from 83.0% on Monday to 94.0% on Friday. With about 51 flights behind each day, a spread of 11 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late F9 3229 runs when it is late
F9 3229 often beats the schedule: 154 of 353 completed flights, 44%, arrived 15 minutes or more early. The 44 late arrivals split 17 under half an hour, 10 between 30 and 60 minutes, and 17 an hour or more.
- 15+ min early154 flights43.6%
- Within 15 min155 flights43.9%
- 15–29 min late17 flights4.8%
- 30–59 min late10 flights2.8%
- 1–2 hours late6 flights1.7%
- 2+ hours late11 flights3.1%
Scale runs 0% to 100%.
Share of 353 completed flights by arrival against schedule.
6 of 37 late departures made up the time and arrived on time, 16% of them. 13 flights left on time and still arrived late.
The worst days
Worst days for F9 3229
The latest arrival of the period was on 1 April 2026, 8 hours 18 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 1 April 2026 | 8 hours 18 minutes | Late-arriving aircraft |
| 25 December 2025 | 7 hours 58 minutes | Carrier |
| 23 February 2026 | 5 hours 57 minutes | Late-arriving aircraft |
| 16 February 2026 | 5 hours 49 minutes | Late-arriving aircraft |
| 7 May 2026 | 5 hours 15 minutes | Carrier |
Delay causes
Why F9 3229 runs late
Carrier accounts for 54% of the 4,265 delay minutes carriers reported here, and the remaining four split what is left.
- 54%Carrier
- 35%Late-arriving aircraft
- 12%National Airspace System
35% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 4,265 reported delay minutes here, that single category outweighs weather by 35 to one. The split is drawn from 4,265 delay minutes reported on F9 3229.
Cancellations are rare at 0.84%, below the national 1.89% 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
Badly late arrivals are rare here: only 4.8% land an hour or more behind schedule, against 8.3% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.
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.
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: 87.5% on time and 0.84% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- IAH to DEN, every carrier and departure
- DEN to IAH, the return direction
- United Airlines 1654 on the same route66.6%
- George Bush Intercontinental (IAH) delay statistics
- Denver International (DEN) delay statistics
- Frontier Airlines on-time record
- Every Frontier Airlines flight number with a record
- The most and least reliable flight numbers in the US
- Why the first flight of the morning is statistically safest
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, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.