Houston (IAH) to Baltimore (BWI): On-Time Performance
Data through May 2026
Houston (IAH) to Baltimore (BWI) effectively runs on two schedules. In September 2024, 93% of arrivals were on time; in July 2024 that fell to 42% — a 51-point seasonal swing. Across the full period the route averages 77% on-time against a national 78%. Morning departures also hold up better than evening ones (84% vs 68%), which matters most in the rough months.
- On-time
- 77%
- arrived <15 min late
- Avg delay
- 16 min
- completed flights
- Cancelled
- 1.3%
- Flights/day
- 3.6
- last 12 months
- Duration
- 3h 5m
- scheduled
- Distance
- 1,235 mi
Best airline from IAH to BWI
3 airlines flew this route regularly between 2024-06 and 2026-05.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| Spirit Airlinesmost reliable | 78% | 14 min | 1.7% | 967 |
| United Airlines | 77% | 16 min | 0.9% | 1,466 |
| Frontier Airlines | 58% | 36 min | 3.4% | 88 |
Monthly on-time trend
Best time to fly from IAH to BWI
Aim for departures around 7 a.m. (88% on-time); avoid 4 p.m. departures (52%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 74% | 16 min |
| Tuesday | 79% | 15 min |
| Wednesdaybest | 80% | 15 min |
| Thursday | 80% | 10 min |
| Friday | 77% | 16 min |
| Saturday | 73% | 19 min |
| Sunday | 74% | 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 aircraft33%
- Airline operations42%
- National airspace system18%
- Weather7%
Frequently asked questions
- How often are flights from IAH to BWI delayed?
- 24% of IAH–BWI 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 16 minutes.
- Which airline is most reliable from IAH to BWI?
- Spirit Airlines has the best on-time record on this route at 78%, based on 967 flights. 3 airlines flew IAH–BWI frequently enough to compare in this period.
- What is the best time of day to fly from IAH to BWI?
- Departures around 7 a.m. have the best record (88% on-time), while departures around 4 p.m. have the worst (52%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from IAH to BWI?
- The scheduled IAH–BWI flight time averages 3h 5m over 1,235 miles. Actual arrival times vary — flights on this route land 15+ minutes late 24% of the time.
- How often are IAH to BWI flights cancelled?
- 1.3% of scheduled flights on this route were cancelled between 2024-06 and 2026-05, at or below the national rate of 1.6%.
- What is the worst month to fly from IAH to BWI?
- July 2024 was the roughest month in this dataset, with only 42% of arrivals on time. The best was September 2024 at 93%. If your dates are flexible, that 51-point gap is worth planning around.
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Related guides
Based on 2,523 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.