Southwest Airlines BWI to BOS on-time performance
Southwest Airlines nonstop flights from Baltimore to Boston · Aug 2025 – Jul 2026
On-time arrivals
72%
arrived < 15 min late
Cancelled
2.4%
56 flights
Avg arrival delay
18 min
61 min when late
Rank on route
#2 of 3
route average 75% on time
Key facts
- Southwest Airlines flights on BWI to BOS arrived on time 72% of the time in Aug 2025 – Jul 2026.
- 2.4% were cancelled, and 9% arrived an hour or more late.
- That ranks #2 of 3 airlines on this route, which averaged 75% on time overall.
- The largest source of delay minutes was air traffic control & airport congestion (39%).
On-time trend by month
Why this airline's flights were late
- Air traffic control & airport congestion39%
- Late-arriving aircraft29%
- Airline (crew, maintenance, cleaning, fueling)28%
- Extreme weather4%
- Security0%
Other airlines on BWI to BOS
- Republic Airways81% on time · 16 min avg delay
- Spirit Airlines71% on time · 13 min avg delay
Full BWI to BOS comparison →
Southwest Airlines on-time record across all routes →
2,376 Southwest Airlines flights tracked on this route; 56 cancelled, 5 diverted.
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. How we calculate this.