Baltimore (BWI) to Boston (BOS): On-Time Performance
Data through July 2026
Baltimore (BWI) to Boston (BOS) effectively runs on two schedules. In November 2024, 87% of arrivals were on time; in September 2025 that fell to 60% — a 27-point seasonal swing. Across the full period the route averages 76% on-time against a national 78%. Morning departures also hold up better than evening ones (91% vs 63%), which matters most in the rough months.
- On-time
- 76%
- arrived <15 min late
- Avg delay
- 17 min
- completed flights
- Cancelled
- 2.1%
- Flights/day
- 9.6
- last 12 months
- Duration
- 1h 33m
- scheduled
- Distance
- 369 mi
Best airline from BWI to BOS
3 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| Republic Airwaysmost reliable | 82% | 16 min | 2.6% | 2,154 |
| Southwest Airlines | 74% | 18 min | 1.8% | 5,090 |
| Spirit Airlines | 74% | 20 min | 2.4% | 837 |
Monthly on-time trend
Best time to fly from BWI to BOS
Aim for departures around 5 a.m. (96% on-time); avoid 6 p.m. departures (56%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 73% | 20 min |
| Tuesday | 79% | 14 min |
| Wednesdaybest | 80% | 14 min |
| Thursday | 74% | 21 min |
| Friday | 76% | 19 min |
| Saturday | 79% | 14 min |
| Sunday | 72% | 18 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft30%
- Airline operations29%
- National airspace system36%
- Weather5%
Frequently asked questions
- How often are flights from BWI to BOS delayed?
- 24% of BWI–BOS 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 17 minutes.
- Which airline is most reliable from BWI to BOS?
- Republic Airways has the best on-time record on this route at 82%, based on 2,154 flights. 3 airlines flew BWI–BOS frequently enough to compare in this period.
- What is the best time of day to fly from BWI to BOS?
- Departures around 5 a.m. have the best record (96% on-time), while departures around 6 p.m. have the worst (56%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from BWI to BOS?
- The scheduled BWI–BOS flight time averages 1h 33m over 369 miles. Actual arrival times vary — flights on this route land 15+ minutes late 24% of the time.
- How often are BWI to BOS 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 BWI to BOS?
- September 2025 was the roughest month in this dataset, with only 60% of arrivals on time. The best was November 2024 at 87%. If your dates are flexible, that 27-point gap is worth planning around.
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Based on 8,081 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.