Carrier route record
F9IAH→RDU
Frontier Airlines · Houston to Raleigh
- Flights
- 246
- Period
- September 2025 to August 2026
- Share of route
- 26%
- Carriers
- 3
Historical statistics for September 2025 to August 2026, not live status. For today’s flights, check with Frontier Airlines.
Frontier on IAH to RDU lands a B, 2 points 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 an hour and a half on average. That rests on 246 flights, with a median arrival 9 minutes early.
The US average over the same twelve months is 77.3%, so there is little to separate Frontier on IAH to RDU from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
79.4%
Arrivals under 15 minutes late, of 238 completed flights
Avg delay
82 min
Across delayed arrivals only, not all flights
Cancelled
2.44%
National rate is 1.89%
Whole route
83.2%
Every carrier on IAH to RDU, 943 flights
These figures cover 246 flights between September 2025 and August 2026. Beyond the headline rate, 8.4% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
Fare search by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Carrier by carrier
Frontier against every carrier on IAH to RDU
Frontier flew 246 of the 943 flights on IAH to RDU, about 26% of it. Its 79.4% on time is 4 points worse than the route as a whole, which runs 83.2%. Ranked by on-time rate it is number two of three carriers on the route, where the range runs from United at 84.6% to SkyWest at 0.0%. One of those carriers flew fewer than 365 flights here, so treat their positions as rough.
Only one carrier clears this site's 365-flight floor here, so there is no comparison to draw. The table below is the full picture.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| United Airlines | 696 | 84.6% | 61 min | 0.86% | B+ |
| Frontier Airlines (this page)thin sample | 246 | 79.4% | 82 min | 2.44% | B |
| SkyWest Airlinesthin sample | 1 | 0.0% | 22 min | 0.00% | F+ |
Timetable by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Departure window
When Frontier runs best on this route
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 15 points, against half a point between the best and worst carrier.
- 5am–8am—
- 8am–11am119 flights83.8%
- 11am–2pm9 flights—
- 2pm–5pm67 flights69.2%
- 5pm–8pm51 flights81.2%
- 8pm–5am—
Scale runs 60% to 90%. Rows with fewer than 30 flights show a dash.
Book the morning departure. Flights leaving between 8am–11am arrive on time 83.8% of the time, against 69.2% for the afternoon window. That is 15 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 8am–11am window is the busiest, with 119 flights scheduled in it.
Across the year
Frontier on IAH to RDU through the year
- Jul–Sep 202517 flights—
- Oct–Dec 202556 flights67.9%
- Jan–Mar 202646 flights77.3%
- Apr–Jun 202665 flights81.2%
- Jul–Sep 202662 flights83.3%
Scale runs 60% to 90%. Rows with fewer than 30 flights show a dash.
Monthly volumes are too low here to break the year into twelve reliable readings. What the twelve-month total says is 79.4% on time across 246 flights.
Frontier on IAH to RDU did not run the same all year. Its best quarter was Jul–Sep 2026 at 83.3% on time and its weakest Oct–Dec 2025 at 67.9%, a swing of 15 points on roughly 62 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.
Across the week, Thursday is the strongest day at 81.2% on time and Sunday the weakest at 72.9%, a spread of 8 points.
Arrival by arrival
How late Frontier on IAH to RDU runs when it is late
Frontier on IAH to RDU often beats the schedule: 84 of 238 completed flights, 35%, arrived 15 minutes or more early. The 49 late arrivals split 12 under half an hour, 17 between 30 and 60 minutes, and 20 an hour or more.
- 15+ min early84 flights35.3%
- Within 15 min105 flights44.1%
- 15–29 min late12 flights5.0%
- 30–59 min late17 flights7.1%
- 1–2 hours late11 flights4.6%
- 2+ hours late9 flights3.8%
Scale runs 0% to 100%.
Share of 238 completed flights by arrival against schedule.
17 of 60 late departures made up the time and arrived on time, 28% of them. 6 flights left on time and still arrived late.
The worst days
Worst days for Frontier on IAH to RDU
The latest arrival of the period was on 21 June 2026, 5 hours 11 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 21 June 2026 | 5 hours 11 minutes | Late-arriving aircraft |
| 17 November 2025 | 4 hours 52 minutes | Late-arriving aircraft |
| 30 January 2026 | 4 hours 23 minutes | Carrier |
| 27 July 2026 | 4 hours 3 minutes | Late-arriving aircraft |
| 13 July 2026 | 3 hours 52 minutes | Late-arriving aircraft |
Delay causes
Why Frontier runs late on this route
Late-arriving aircraft accounts for 62% of the 4,034 delay minutes carriers reported here, and the remaining four split what is left.
- 62%Late-arriving aircraft
- 27%Carrier
- 9%National Airspace System
- 2%Extreme weather
62% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 4,034 reported delay minutes here, that single category outweighs weather by 41 to one. The split is drawn from 4,034 reported delay minutes.
The practical consequence: the 8am–11am departure is the one that starts clean. Its aircraft has no earlier leg to be late from, which is exactly why that window shows 83.8% on time here.
Cancellations sit at 2.44% against a national 1.89%, which is ordinary. Diversions add another 0.81%.
Connections and stage length
What a delay here costs
8.4% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last an hour and a half, which a normal layover absorbs.
The 1,042 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.
The return leg runs 76.8% on time across 246 flights, within 3 points of this direction. The two legs are scored separately because they usually differ; on this city pair they happen not to.
One caution: this is a thin sample. 246 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 Frontier on IAH to RDU
Put together: treat all of this as provisional. 246 flights over twelve months is enough to clear this site's floor and not enough to be confident to better than a couple of points. The 79.4% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 238 completed flights over 12 months sit behind that.
Related
Where to go next
- IAH to RDU, every carrier
- Frontier on RDU to IAH, the return leg
- United Airlines on IAH to RDU84.6%
- Frontier Airlines network-wide record
- George Bush Intercontinental (IAH) delay statistics
- Raleigh-Durham International (RDU) delay statistics
- Why the first flight of the morning is statistically safest
- The best time of day to fly, according to 7.05 million flight records
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.