Boston (BOS) to Baltimore (BWI): On-Time Performance
Data through July 2026
Boston (BOS) to Baltimore (BWI) effectively runs on two schedules. In January 2025, 91% of arrivals were on time; in June 2025 that fell to 69% — a 23-point seasonal swing. Across the full period the route averages 80% on-time against a national 78%. Morning departures also hold up better than evening ones (91% vs 62%), which matters most in the rough months.
- On-time
- 80%
- arrived <15 min late
- Avg delay
- 15 min
- completed flights
- Cancelled
- 2.1%
- Flights/day
- 9.6
- last 12 months
- Duration
- 1h 40m
- scheduled
- Distance
- 369 mi
Best airline from BOS to BWI
3 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| Republic Airwaysmost reliable | 83% | 12 min | 2.6% | 2,155 |
| Southwest Airlines | 79% | 16 min | 1.7% | 5,056 |
| Spirit Airlines | 75% | 22 min | 2.9% | 832 |
Monthly on-time trend
Best time to fly from BOS to BWI
Aim for departures around 5 a.m. (95% on-time); avoid 7 p.m. departures (51%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 77% | 17 min |
| Tuesdaybest | 86% | 11 min |
| Wednesday | 84% | 11 min |
| Thursday | 78% | 17 min |
| Friday | 78% | 16 min |
| Saturday | 80% | 15 min |
| Sunday | 74% | 19 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft51%
- Airline operations23%
- National airspace system23%
- Weather3%
Frequently asked questions
- How often are flights from BOS to BWI delayed?
- 20% of BOS–BWI flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-07 and 2026-07. The average arrival delay across completed flights was 15 minutes.
- Which airline is most reliable from BOS to BWI?
- Republic Airways has the best on-time record on this route at 83%, based on 2,155 flights. 3 airlines flew BOS–BWI frequently enough to compare in this period.
- What is the best time of day to fly from BOS to BWI?
- Departures around 5 a.m. have the best record (95% on-time), while departures around 7 p.m. have the worst (51%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from BOS to BWI?
- The scheduled BOS–BWI flight time averages 1h 40m over 369 miles. Actual arrival times vary — flights on this route land 15+ minutes late 20% of the time.
- How often are BOS to BWI flights cancelled?
- 2.1% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, slightly above the national rate of 1.6%.
- What is the worst month to fly from BOS to BWI?
- June 2025 was the roughest month in this dataset, with only 69% of arrivals on time. The best was January 2025 at 91%. If your dates are flexible, that 23-point gap is worth planning around.
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Based on 8,043 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.