Boston (BOS) to Houston (IAH): On-Time Performance
Data through July 2026
When you fly BOS to IAH matters as much as anything else about the booking: the route swung from 91% on-time in October 2024 to just 58% in July 2024. Across the full period the route averages 79% on-time against a national 78%. Morning departures also hold up better than evening ones (87% vs 65%), which matters most in the rough months.
- On-time
- 79%
- arrived <15 min late
- Avg delay
- 15 min
- completed flights
- Cancelled
- 1.7%
- Flights/day
- 5.5
- last 12 months
- Duration
- 4h 24m
- scheduled
- Distance
- 1,597 mi
Best airline from BOS to IAH
3 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| United Airlinesmost reliable | 81% | 14 min | 1.4% | 3,184 |
| JetBlue Airways | 71% | 17 min | 1.8% | 906 |
| Spirit Airlines | 58% | 29 min | 11.3% | 97 |
Monthly on-time trend
Best time to fly from BOS to IAH
Aim for departures around 5 a.m. (93% on-time); avoid 2 p.m. departures (58%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 77% | 17 min |
| Tuesday | 81% | 12 min |
| Wednesdaybest | 84% | 9 min |
| Thursday | 76% | 18 min |
| Friday | 75% | 17 min |
| Saturday | 79% | 15 min |
| Sunday | 79% | 16 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft40%
- Airline operations27%
- National airspace system32%
- Weather2%
Frequently asked questions
- How often are flights from BOS to IAH delayed?
- 21% of BOS–IAH flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-07 and 2026-07. The average arrival delay across completed flights was 15 minutes.
- Which airline is most reliable from BOS to IAH?
- United Airlines has the best on-time record on this route at 81%, based on 3,184 flights. 3 airlines flew BOS–IAH frequently enough to compare in this period.
- What is the best time of day to fly from BOS to IAH?
- Departures around 5 a.m. have the best record (93% on-time), while departures around 2 p.m. have the worst (58%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from BOS to IAH?
- The scheduled BOS–IAH flight time averages 4h 24m over 1,597 miles. Actual arrival times vary — flights on this route land 15+ minutes late 21% of the time.
- How often are BOS to IAH flights cancelled?
- 1.7% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, slightly above the national rate of 1.6%.
- What is the worst month to fly from BOS to IAH?
- July 2024 was the roughest month in this dataset, with only 58% of arrivals on time. The best was October 2024 at 91%. If your dates are flexible, that 34-point gap is worth planning around.
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Based on 4,187 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.