Best Time to Fly BWI to IAH: On-Time Stats by Hour & Airline
Baltimore/Washington International Thurgood Marshall → George Bush Intercontinental/Houston
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 79.3% of Baltimore (BWI) to Houston (IAH) flights arrived on time (1,310 scheduled flights). That is 1.7 points above the national average of 77.6%.
United Airlines was the most punctual of the 3 airlines on the route at 83.9%, while Frontier Airlines trailed at 61.4%.
October has been the best month (91% on time) and Monday the weakest day of the week (77%).
2.0% of flights were cancelled, versus 1.8% nationally.
BWI to IAH 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 | 83.9% | 73 min | 1.1% | 829 |
| Spirit Airlines | 75.5% | 101 min | 2.4% | 331 |
| Frontier Airlines | 61.4% | 96 min | 6.0% | 149 |
| SkyWest Airlines | Limited data | 1 | ||
80%+ good 70–79.9% fair <70% poor
Best time of day to fly BWI to IAH
On-time arrival % by scheduled departure hour (local time), 2,520 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 84.5% | 4.9% | 61 |
| 6am–7am | 92.4% | 1.5% | 667 |
| 7am–8am | Limited data | 5 | |
| 8am–9am | 86.2% | 1.9% | 162 |
| 9am–10am | 93.7% | 0.0% | 63 |
| 10am–11am | 88.2% | 1.4% | 69 |
| 11am–12pm | 79.0% | 0.0% | 119 |
| 12pm–1pm | 87.2% | 1.1% | 189 |
| 1pm–2pm | 82.3% | 0.0% | 34 |
| 2pm–3pm | 74.6% | 1.1% | 184 |
| 3pm–4pm | 67.9% | 1.1% | 187 |
| 4pm–5pm | 75.9% | 2.0% | 254 |
| 5pm–6pm | 61.7% | 0.0% | 116 |
| 6pm–7pm | 69.2% | 0.7% | 147 |
| 7pm–8pm | 62.4% | 4.7% | 106 |
| 8pm–9pm | 75.8% | 3.1% | 128 |
| 9pm–10pm | Limited data | 21 | |
| 10pm–11pm | Limited data | 8 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on BWI to IAH
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) | 79.6% | -2.8 pts | 1.8% | 55 |
| Christmas & New Year (Dec 20 - Jan 3) | 75.0% | -7.5 pts | 1.8% | 110 |
| Summer peak (Jun 15 - Aug 15) | 73.6% | -8.9 pts | 1.9% | 418 |
| All other days | 82.5% | — | 1.6% | 1,937 |
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).