Baltimore (BWI) to Houston (IAH): On-Time Performance
Data through May 2026
The calendar drives reliability on BWI–IAH. October 2024 flights landed on schedule 95% of the time, but July 2024 dropped to 51% — a gap of 44 points. Across the full period the route averages 80% on-time against a national 78%. Morning departures also hold up better than evening ones (88% vs 66%), which matters most in the rough months.
- On-time
- 80%
- arrived <15 min late
- Avg delay
- 18 min
- completed flights
- Cancelled
- 1.8%
- Flights/day
- 3.6
- last 12 months
- Duration
- 3h 30m
- scheduled
- Distance
- 1,235 mi
Best airline from BWI to IAH
3 airlines flew this route regularly between 2024-06 and 2026-05.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| United Airlinesmost reliable | 83% | 14 min | 1.3% | 1,466 |
| Spirit Airlines | 75% | 22 min | 2.2% | 970 |
| Frontier Airlines | 69% | 29 min | 5.7% | 88 |
Monthly on-time trend
Best time to fly from BWI to IAH
Aim for departures around 6 a.m. (90% on-time); avoid 10 p.m. departures (41%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 76% | 24 min |
| Tuesdaybest | 84% | 10 min |
| Wednesday | 81% | 19 min |
| Thursday | 82% | 16 min |
| Friday | 79% | 18 min |
| Saturday | 79% | 15 min |
| Sunday | 78% | 21 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft25%
- Airline operations36%
- National airspace system34%
- Weather6%
Frequently asked questions
- How often are flights from BWI to IAH delayed?
- 21% of BWI–IAH flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-06 and 2026-05. The average arrival delay across completed flights was 18 minutes.
- Which airline is most reliable from BWI to IAH?
- United Airlines has the best on-time record on this route at 83%, based on 1,466 flights. 3 airlines flew BWI–IAH frequently enough to compare in this period.
- What is the best time of day to fly from BWI to IAH?
- Departures around 6 a.m. have the best record (90% on-time), while departures around 10 p.m. have the worst (41%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from BWI to IAH?
- The scheduled BWI–IAH flight time averages 3h 30m over 1,235 miles. Actual arrival times vary — flights on this route land 15+ minutes late 21% of the time.
- How often are BWI to IAH flights cancelled?
- 1.8% of scheduled flights on this route were cancelled between 2024-06 and 2026-05, slightly above the national rate of 1.6%.
- What is the worst month to fly from BWI to IAH?
- July 2024 was the roughest month in this dataset, with only 51% of arrivals on time. The best was October 2024 at 95%. If your dates are flexible, that 44-point gap is worth planning around.
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Based on 2,525 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.