IAH to RDU flight delays
Houston, TX (IAH) Raleigh/Durham, NC (RDU) · 1,042 miles
906 flights · January 2025 – August 2026 · US Bureau of Transportation Statistics
82.23%
Arrived on time
Within 15 minutes of schedule
1.1%
Cancelled
Share of scheduled flights
73 min
When late, late by
Average across delayed arrivals
14 min
Delay per flight
Averaged over every flight flown
What the record says about this route
The season swings this route hard. In September it ran 31.1 points more punctual than in July — a difference bigger than the one between the best and worst airlines on most routes. If the date is flexible, it is worth more than the carrier.
Which airline you fly changes the odds here. United Airlines arrived on time 7 points more often than Frontier Airlines over the same period on the same route — same airports, same weather, same air traffic control. A gap that survives all of that is about how the two airlines are run.
The shape of the lateness matters here. Flights on this route are not late often, but when they are late they are late by about 73 minutes — long enough to lose a connection or an evening. The on-time percentage looks reassuring and understates the consequence of being on the wrong flight.
Flights from Houston to Raleigh/Durham keep to schedule more reliably than most. On a route this punctual the day you fly matters more than the airline you pick.
Which airline should you fly on this route?
Over January 2025 – August 2026, United Airlines arrived on time most often on IAH to RDU. Frontier Airlines was late most often. Flights ran closest to schedule in September and worst in July.
Every airline on IAH to RDU
Ranked by how many flights each one operated. A carrier with fewer than 100 flights in the period is listed but not graded.
| Airline | Flights | On time | Cancelled | Avg delay | Grade |
|---|---|---|---|---|---|
| United Airlines | 700 | 83.88% | 0.71% | 67 min | B |
| Frontier Airlines | 205 | 76.88% | 2.44% | 86 min | D |
| SkyWest Airlines | 1 | 0% | 0% | 22 min | — |
Month by month
Share of flights that arrived within 15 minutes of schedule, by month flown.
The return leg
RDU to IAH Raleigh/Durham back to Houston 83.46% on time BOther routes from Houston
Common questions
Are flights from Houston to Raleigh/Durham usually delayed?
82.23% of flights on the IAH to RDU route arrived within 15 minutes of schedule, so roughly 2 in every ten arrived late. That is better than the average route in this record.
Which airline is most on time from Houston to Raleigh/Durham?
United Airlines, at 83.88% on time across 700 flights. The least punctual on the route was Frontier Airlines at 76.88%.
How often are IAH to RDU flights cancelled?
1.1% of scheduled flights did not operate — about 11 in every thousand. That is in the normal range.
What is the best month to fly Houston to Raleigh/Durham?
September, when 93.2% of flights arrived on time. The worst was July at 62.1%.
When IAH to RDU flights are late, how late are they?
About 73 minutes on average across the flights that arrived more than 15 minutes behind schedule.
What these figures do and do not tell you
Everything on this page is counted from the flights that actually operated on IAH to RDU during January 2025 – August 2026, as reported by the airlines to the US Bureau of Transportation Statistics. "On time" is the federal definition: arriving at the gate within 15 minutes of the scheduled time.
A route's record is a description of the past, not a forecast. Weather, air traffic control and the aircraft's earlier flights that day drive most delays, and none of them are predictable from a historical rate. What the record does tell you is whether this route runs late more often than others, and which carrier on it has the better history — which is the part you can actually act on when you book.
Cancellations are counted separately from delays because they are a different problem for a traveller: a late flight still gets you there. How the grade is calculated →