Best Time to Fly IAH to BWI: On-Time Stats by Hour & Airline
George Bush Intercontinental/Houston → Baltimore/Washington International Thurgood Marshall
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 76.4% of Houston (IAH) to Baltimore (BWI) flights arrived on time (1,311 scheduled flights). That is 1.3 points below the national average of 77.6%.
Among 3 airlines, United Airlines led with 79.7% on time and Frontier Airlines was last with 52.1%.
Over 24 months, Wednesday was the most reliable day (80% on time) and July the worst month (60%).
The cancellation rate was 1.4% (US average 1.8%).
IAH to BWI on-time performance by airline
Last 12 months. Airlines with fewer than 30 completed flights are marked “limited data”.
| Airline | On time | Avg delay when late | Cancelled | Flights |
|---|---|---|---|---|
| United Airlines | 79.7% | 62 min | 0.6% | 828 |
| Spirit Airlines | 78.2% | 58 min | 1.8% | 332 |
| Frontier Airlines | 52.1% | 73 min | 5.4% | 149 |
| SkyWest Airlines | Limited data | 2 | ||
80%+ good 70–79.9% fair <70% poor
Best time of day to fly IAH to BWI
On-time arrival % by scheduled departure hour (local time), 2,519 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 79.8% | 3.0% | 168 |
| 6am–7am | 85.9% | 0.8% | 243 |
| 7am–8am | 88.8% | 0.5% | 206 |
| 8am–9am | 84.8% | 0.0% | 46 |
| 9am–10am | Limited data | 3 | |
| 11am–12pm | 80.5% | 1.1% | 89 |
| 12pm–1pm | 83.3% | 0.3% | 665 |
| 1pm–2pm | 69.2% | 2.5% | 40 |
| 2pm–3pm | Limited data | 13 | |
| 3pm–4pm | Limited data | 25 | |
| 4pm–5pm | 45.0% | 6.5% | 108 |
| 5pm–6pm | 80.5% | 3.5% | 85 |
| 6pm–7pm | 69.4% | 0.8% | 720 |
| 7pm–8pm | 71.8% | 1.2% | 86 |
| 8pm–9pm | Limited data | 5 | |
| 9pm–10pm | Limited data | 17 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on IAH to BWI
On-time arrivals during holiday periods compared with all other days, last 24 months.
| Period | On time | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Thanksgiving week (Tue before to Mon after) | 77.8% | -2.9 pts | 0.0% | 54 |
| Christmas & New Year (Dec 20 - Jan 3) | 72.9% | -7.8 pts | 2.7% | 110 |
| Summer peak (Jun 15 - Aug 15) | 62.4% | -18.2 pts | 2.1% | 419 |
| All other days | 80.7% | — | 0.9% | 1,936 |
Monthly on-time trend
On-time arrival % each month, with the 12-month US average for reference.
What causes delays on this route
Share of reported delay minutes, last 12 months (BTS cause categories).