Flight number record
F9 3135
Frontier Airlines · Chicago to Houston
- Route
- ORD → IAH
- Departs
- 17:46
- Flights
- 276
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s F9 3135, check with Frontier Airlines.
F9 3135 lands a B−, about a point better than the national rate of 77.3%. About one flight in five arrives 15 minutes late or worse, and those flights are late by close to two hours on average. That rests on 276 flights, with a median arrival 13 minutes early.
Key figures
On time
78.6%
Arrivals under 15 minutes late, of 266 completed flights
Avg delay
103 min
Across delayed arrivals only, not all flights
Cancelled
3.26%
National rate is 1.89%
1 hour+ late
13.2%
National rate is 8.3%
These figures cover 276 flights between September 2025 and August 2026. Beyond the headline rate, 13.2% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When F9 3135 flies
F9 3135 flies ORD to IAH without a single fixed slot. Its most common scheduled departure was 17:46, used on 39 of 276 flights, with 16:05 (31 flights) next.
- Departs 17:4639 flights14.1%
- Departs 16:0531 flights11.2%
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 17:46 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and F9 3135 runs 11 points better at 78.6%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
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Against the route
F9 3135 next to ORD to IAH
Every carrier on ORD to IAH combined arrived on time 76.0% of the time across 6,141 flights, so F9 3135 is 3 points ahead of it. Across its whole network Frontier Airlines managed 72.7%, which this flight beats by 6 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| F9 3135thin sample | 276 | 78.6% | 103 min | 3.26% | B− |
| All Frontier Airlines on ORD–IAHthin sample | 276 | 78.6% | 103 min | 3.26% | B− |
| All carriers on ORD–IAH | 6,141 | 76.0% | 74 min | 1.40% | B |
| Frontier Airlines, whole network | 213,022 | 72.7% | 84 min | 2.05% | C |
Across the year
F9 3135 quarter by quarter
F9 3135 did not run the same all year. Its best quarter was Jan–Mar 2026 at 85.1% on time and its weakest Oct–Dec 2025 at 72.9%, a swing of 12 points on roughly 69 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 202517 flights—
- Oct–Dec 202560 flights72.9%
- Jan–Mar 202649 flights85.1%
- Apr–Jun 202688 flights76.5%
- Jul–Sep 202662 flights81.0%
Scale runs 65% to 90%. Rows with fewer than 30 flights show a dash.
By weekday, F9 3135 did best on Monday at 83.3% on time and worst on Sunday at 69.2%. Each day rests on about 39 flights, so a gap of 14 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late F9 3135 runs when it is late
F9 3135 often beats the schedule: 120 of 266 completed flights, 45%, arrived 15 minutes or more early. When F9 3135 is late it tends to be very late: 35 of its 57 late arrivals were an hour or more behind, and 15 were two hours or more.
- 15+ min early120 flights45.1%
- Within 15 min89 flights33.5%
- 15–29 min late9 flights3.4%
- 30–59 min late13 flights4.9%
- 1–2 hours late20 flights7.5%
- 2+ hours late15 flights5.6%
Scale runs 0% to 100%.
Share of 266 completed flights by arrival against schedule.
20 of 67 late departures made up the time and arrived on time, 30% of them. 10 flights left on time and still arrived late.
The worst days
Worst days for F9 3135
The latest arrival of the period was on 15 September 2025, 13 hours 27 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on five of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 15 September 2025 | 13 hours 27 minutes | Late-arriving aircraft |
| 6 June 2026 | 5 hours 11 minutes | Late-arriving aircraft |
| 17 November 2025 | 4 hours 39 minutes | Late-arriving aircraft |
| 7 July 2026 | 4 hours 1 minute | Late-arriving aircraft |
| 24 June 2026 | 3 hours 41 minutes | Late-arriving aircraft |
Delay causes
Why F9 3135 runs late
Late-arriving aircraft accounts for 64% of the 5,896 delay minutes carriers reported here, and the remaining four split what is left.
- 64%Late-arriving aircraft
- 18%Carrier
- 17%National Airspace System
- 2%Extreme weather
64% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 5,896 reported delay minutes here, that single category outweighs weather by 32 to one. The split is drawn from 5,896 delay minutes reported on F9 3135.
Cancellations run at 3.26%, against 1.89% nationally. That is about one flight in 30 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
13.2% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection here, and two hours if the onward flight is on a separate ticket.
The 925 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 276 flights under F9 3135 in the data flew ORD to IAH. 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. 276 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 3135
For a booking, the cancellation rate is the figure to plan around on F9 3135: 3.26% of its 276 scheduled flights did not operate. A late arrival costs close to two hours, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- ORD to IAH, every carrier and departure
- IAH to ORD, the return direction
- American Airlines 3144 on the same route52.5%
- United Airlines 1231 on the same route91.4%
- United Airlines 2638 on the same route86.0%
- United Airlines 2426 on the same route72.3%
- Chicago O'Hare International (ORD) delay statistics
- George Bush Intercontinental (IAH) 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.