Baltimore/Washington International Thurgood Marshall (BWI) Delays and On-Time Departures
Baltimore, MD · ranked 312th of 333 airports for on-time departures
Data through July 2026 · Last updated October 18, 2026
72.9% of the 94,429 flights scheduled to depart Baltimore (BWI) in the last 12 months left on time, 4.5 points below the US average of 77.4%.
That ranks 312th of 333 US airports tracked on this site, with 1.8% of departures cancelled.
Among airlines at Baltimore (BWI), United Airlines left on time most often (85.4%).
Over 24 months, Wednesday was the most reliable day (79% on time) and July the worst month (61%).
Best time of day to fly out of Baltimore (BWI)
On-time departure % by scheduled departure hour (local time), last 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 12am–1am | Limited data | 1 | |
| 5am–6am | 92.4% | 2.0% | 1,666 |
| 6am–7am | 91.5% | 1.5% | 18,002 |
| 7am–8am | 88.6% | 1.1% | 7,247 |
| 8am–9am | 88.2% | 1.1% | 18,915 |
| 9am–10am | 81.1% | 1.1% | 9,840 |
| 10am–11am | 83.2% | 1.2% | 14,619 |
| 11am–12pm | 80.0% | 1.1% | 9,669 |
| 12pm–1pm | 77.3% | 1.0% | 7,659 |
| 1pm–2pm | 72.8% | 1.2% | 9,568 |
| 2pm–3pm | 71.1% | 0.8% | 9,491 |
| 3pm–4pm | 65.9% | 1.3% | 10,982 |
| 4pm–5pm | 67.1% | 1.5% | 10,227 |
| 5pm–6pm | 63.6% | 1.8% | 10,851 |
| 6pm–7pm | 64.4% | 2.0% | 13,138 |
| 7pm–8pm | 60.3% | 2.3% | 11,554 |
| 8pm–9pm | 59.7% | 2.5% | 12,239 |
| 9pm–10pm | 57.0% | 2.2% | 9,231 |
| 10pm–11pm | 48.3% | 3.9% | 6,532 |
| 11pm–12am | Limited data | 9 | |
Airlines at BWI ranked by on-time departures
Last 12 months. Airlines with fewer than 30 departures are marked “limited data”.
| Airline | On-time departures | On-time arrivals | Cancelled | Departures |
|---|---|---|---|---|
| United Airlines | 85.4% | 80.6% | 1.0% | 4,177 |
| Delta Air Lines | 84.8% | 85.9% | 1.9% | 5,308 |
| Republic Airways | 82.8% | 81.6% | 3.9% | 1,424 |
| Envoy Air | 81.4% | 77.1% | 2.9% | 964 |
| American Airlines | 79.2% | 80.9% | 2.2% | 3,470 |
| Spirit Airlines | 78.2% | 78.5% | 2.9% | 2,630 |
| Alaska Airlines | 77.7% | 72.2% | 0.9% | 679 |
| PSA Airlines | 75.0% | 76.9% | 0.0% | 52 |
| JetBlue | 73.4% | 71.9% | 4.5% | 67 |
| Southwest Airlines | 70.7% | 77.5% | 1.6% | 72,159 |
| Frontier Airlines | 68.5% | 68.3% | 3.4% | 3,470 |
| SkyWest Airlines | Limited data | 29 | ||
80%+ good 70–79.9% fair <70% poor
Best day to fly out of BWI
On-time departures by day, 24 months.
Best month to fly out of BWI
On-time departures by month, 24 months.
Holiday travel at Baltimore (BWI)
On-time departures during holiday periods compared with all other days, last 24 months.
| Period | On-time departures | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Thanksgiving week (Tue before to Mon after) | 75.7% | -1.2 pts | 0.5% | 3,735 |
| Christmas & New Year (Dec 20 - Jan 3) | 62.7% | -14.2 pts | 1.5% | 7,827 |
| Summer peak (Jun 15 - Aug 15) | 62.0% | -14.9 pts | 3.0% | 34,901 |
| All other days | 76.9% | — | 1.3% | 144,977 |
Monthly on-time departure trend at BWI
On-time departure % each month, with the 12-month US average for reference.
Routes from Baltimore (BWI)
Every route from BWI with its own page, by number of flights (last 12 months, on-time arrivals).