Houston (IAH) to Boston (BOS): On-Time Performance
Data through July 2026
The calendar drives reliability on IAH–BOS. February 2026 flights landed on schedule 88% of the time, but October 2025 dropped to 56% — a gap of 32 points. Across the full period the route averages 73% on-time against a national 78%. Morning departures also hold up better than evening ones (85% vs 68%), which matters most in the rough months.
- On-time
- 73%
- arrived <15 min late
- Avg delay
- 21 min
- completed flights
- Cancelled
- 1.7%
- Flights/day
- 5.5
- last 12 months
- Duration
- 3h 53m
- scheduled
- Distance
- 1,597 mi
Best airline from IAH to BOS
3 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| United Airlinesmost reliable | 78% | 17 min | 1.2% | 3,184 |
| JetBlue Airways | 58% | 35 min | 2.5% | 906 |
| Spirit Airlines | 58% | 36 min | 10.3% | 97 |
Monthly on-time trend
Best time to fly from IAH to BOS
Aim for departures around 7 a.m. (93% on-time); avoid 3 p.m. departures (51%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 73% | 27 min |
| Tuesday | 75% | 22 min |
| Wednesday | 77% | 15 min |
| Thursday | 69% | 27 min |
| Friday | 69% | 23 min |
| Saturdaybest | 78% | 14 min |
| Sunday | 72% | 20 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft33%
- Airline operations22%
- National airspace system40%
- Weather6%
Frequently asked questions
- How often are flights from IAH to BOS delayed?
- 27% of IAH–BOS 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 21 minutes.
- Which airline is most reliable from IAH to BOS?
- United Airlines has the best on-time record on this route at 78%, based on 3,184 flights. 3 airlines flew IAH–BOS frequently enough to compare in this period.
- What is the best time of day to fly from IAH to BOS?
- Departures around 7 a.m. have the best record (93% on-time), while departures around 3 p.m. have the worst (51%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from IAH to BOS?
- The scheduled IAH–BOS flight time averages 3h 53m over 1,597 miles. Actual arrival times vary — flights on this route land 15+ minutes late 27% of the time.
- How often are IAH to BOS 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 IAH to BOS?
- October 2025 was the roughest month in this dataset, with only 56% of arrivals on time. The best was February 2026 at 88%. If your dates are flexible, that 32-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.