PWM to IAH flight delays
Portland, ME (PWM) Houston, TX (IAH) · 1,667 miles
13 flights · January 2025 – August 2026 · US Bureau of Transportation Statistics
This route flew fewer than 50 times in the period, which is too few for an on-time rate to mean anything. The figures below are shown as recorded, but the route is not graded.
91.67%
Arrived on time
Within 15 minutes of schedule
0%
Cancelled
Share of scheduled flights
54 min
When late, late by
Average across delayed arrivals
5 min
Delay per flight
Averaged over every flight flown
What the record says about this route
Flights from Portland to Houston are among the most dependable in the record. A route this punctual is usually a short hop between airports with slots to spare.
The two directions do not behave alike. IAH to PWM arrives on time 7 points less often than the outbound. Delay accumulates through the flying day, so whichever direction is scheduled later tends to carry the worse record — which is an argument for booking the morning departure if the choice exists.
This route does better than its own airport. Departures from PWM overall run 9.7 points less punctual than this particular one — so whatever congestion PWM has, this route is largely escaping it.
Every airline on PWM to IAH
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 |
|---|---|---|---|---|---|
| SkyWest Airlines | 12 | 90.91% | 0% | 54 min | — |
| United Airlines | 1 | 100% | 0% | — | — |
Month by month
Share of flights that arrived within 15 minutes of schedule, by month flown.
The return leg
IAH to PWM Houston back to Portland 84.62% on time —Other routes from Portland
Common questions
Are flights from Portland to Houston usually delayed?
91.67% of flights on the PWM to IAH route arrived within 15 minutes of schedule, so roughly 1 in every ten arrived late. That is better than the average route in this record.
How often are PWM to IAH flights cancelled?
0% of scheduled flights did not operate — about 1 in every thousand. That is in the normal range.
When PWM to IAH flights are late, how late are they?
About 54 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 PWM to IAH 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 →