Southwest Airlines SAN to BOS on-time performance
Southwest Airlines nonstop flights from San Diego to Boston · Aug 2025 – Jul 2026
On-time arrivals
33%
arrived < 15 min late
Cancelled
0.0%
0 flights
Avg arrival delay
49 min
71 min when late
Rank on route
#4 of 4
route average 77% on time
Key facts
- Southwest Airlines flights on SAN to BOS arrived on time 33% of the time in Aug 2025 – Jul 2026.
- 0% were cancelled, and 31% arrived an hour or more late.
- That ranks #4 of 4 airlines on this route, which averaged 77% on time overall.
- The largest source of delay minutes was late-arriving aircraft (52%).
On-time trend by month
Why this airline's flights were late
- Late-arriving aircraft52%
- Airline (crew, maintenance, cleaning, fueling)26%
- Air traffic control & airport congestion22%
- Extreme weather0%
- Security0%
Other airlines on SAN to BOS
- JetBlue78% on time · 22 min avg delay
- Alaska Airlines78% on time · 16 min avg delay
- Delta Air Lines80% on time · 19 min avg delay
Full SAN to BOS comparison →
Southwest Airlines on-time record across all routes →
58 Southwest Airlines flights tracked on this route; 0 cancelled, 0 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.