Airports › Baltimore (BWI) › May 2025
Airport month · May 2025
Baltimore/Washington International Thurgood Marshall in May 2025
BTS: A flight is counted as on time if it arrived less than 15 minutes after its scheduled time. Only carriers with at least 0.5 percent of domestic scheduled passenger revenue report.
In May 2025, reporting carriers scheduled 8,411 domestic departures from Baltimore/Washington International Thurgood Marshall (BWI). 70.5% left less than 15 minutes late and 73.0% reached their destination on time; 0.5% were cancelled.
Nationally that month, 76.7% of flights departed on time and 75.4% arrived on time, so BWI departures were 6.2 points below the national departure figure.
A year earlier, in May 2024, the airport had 8,654 departures with 64.5% leaving on time: a change of +6.0 points, with flights down 3%.
Flights arriving at BWI that month were on time 77.3% of the time (8,412 scheduled arrivals).
Of the delay minutes that carriers assigned to a BTS cause category that month, late-arriving aircraft 41%, air carrier 29% and national aviation system 24%.
- On time 73.0%
- Arrived 15+ minutes late 26.1%
- Cancelled 0.5%
- Diverted 0.3%
May 2025 against a year earlier, the airport's year and the nation
| Measure | May 2025 | May 2024 | BWI, 12 months to Jul 2026 | All reported flights, May 2025 |
|---|---|---|---|---|
| Departed on time | 70.5% | 64.5% | 71.7% | 76.7% |
| Arrived on time | 73.0% | 67.7% | 76.4% | 75.4% |
| Cancelled | 0.5% | 0.6% | 1.8% | 1.0% |
| Average departure delay (late minutes only) | 19.2 min | 21.0 min | 16.5 min | 17.5 min |
| Scheduled departures a day | 280 | 289 | 259 | 20,188 |
| Scheduled departures | 8,411 | 8,654 | 94,429 | 605,648 |
Airlines that month
| Reporting carrier | Flights | Share | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| WN Southwest Airlines | 6,186 | 74% | 72.5% | 11.7 min | 0.4% |
| NK Spirit Airlines | 521 | 6% | 69.5% | 16.1 min | 1.0% |
| DL Delta Air Lines | 486 | 6% | 80.9% | 7.9 min | 0.0% |
| UA United Airlines | 356 | 4% | 84.6% | -1.0 min | 0.8% |
| AA American Airlines | 355 | 4% | 80.6% | 8.2 min | 0.8% |
| F9 Frontier Airlines | 243 | 3% | 55.1% | 41.1 min | 2.5% |
| YX Republic Airline | 87 | 1% | 67.8% | 18.1 min | 0.0% |
| MQ Envoy Air | 86 | 1% | 74.4% | 12.6 min | 0.0% |
| AS Alaska Airlines | 58 | 1% | 60.3% | 12.7 min | 0.0% |
| OO SkyWest Airlines | 19 | 0% | 68.4% | 30.5 min | 0.0% |
| OH PSA Airlines | 14 | 0% | 57.1% | -4.3 min | 21.4% |
Busiest routes that month
| Route | Cities | Flights | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| BWI–ATL | Baltimore to Atlanta | 493 | 70.8% | 14.1 min | 0.8% |
| BWI–MCO | Baltimore to Orlando | 432 | 67.6% | 16.3 min | 0.7% |
| BWI–BOS | Baltimore to Boston | 370 | 64.3% | 21.9 min | 0.3% |
| BWI–CLT | Baltimore to Charlotte | 294 | 75.9% | 6.6 min | 1.4% |
| BWI–FLL | Baltimore to Fort Lauderdale | 275 | 77.1% | 8.1 min | 0.4% |
| BWI–TPA | Baltimore to Tampa | 260 | 72.7% | 14.4 min | 0.0% |
| BWI–MIA | Baltimore to Miami | 254 | 70.9% | 16.5 min | 0.4% |
| BWI–DEN | Baltimore to Denver | 243 | 74.1% | 8.1 min | 0.4% |
| BWI–ORD | Baltimore to Chicago | 236 | 80.1% | 4.9 min | 0.8% |
| BWI–DTW | Baltimore to Detroit | 209 | 78.9% | 9.7 min | 0.5% |
| BWI–MDW | Baltimore to Chicago | 181 | 76.2% | 10.3 min | 0.6% |
| BWI–LAS | Baltimore to Las Vegas | 177 | 79.1% | 1.2 min | 0.6% |
By scheduled departure hour
Delay causes
Questions and answers
How many flights left BWI on time in May 2025?
70.5% of 8,411 scheduled domestic departures left less than 15 minutes late, and 73.0% reached their destination on time. The national figures that month were 76.7% and 75.4%.
How does that compare with a year earlier?
In May 2024, 64.5% of 8,654 departures left on time and 0.6% were cancelled, against 70.5% and 0.5% in May 2025.
Provenance
Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, file for May 2025; public domain. Domestic scheduled flights by reporting carriers, totals and averages only. The site's data runs through July 2026. Full record for BWI · methodology · corrections.