Southwest Airlines BOS to SAN on-time performance
Southwest Airlines nonstop flights from Boston to San Diego · Aug 2025 – Jul 2026
On-time arrivals
43%
arrived < 15 min late
Cancelled
3.4%
2 flights
Avg arrival delay
41 min
70 min when late
Rank on route
#4 of 4
route average 77% on time
Key facts
- Southwest Airlines flights on BOS to SAN arrived on time 43% of the time in Aug 2025 – Jul 2026.
- 3.4% were cancelled, and 29% 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 (59%).
On-time trend by month
Why this airline's flights were late
- Late-arriving aircraft59%
- Airline (crew, maintenance, cleaning, fueling)25%
- Air traffic control & airport congestion14%
- Extreme weather2%
- Security0%
Other airlines on BOS to SAN
- JetBlue84% on time · 11 min avg delay
- Alaska Airlines73% on time · 19 min avg delay
- Delta Air Lines68% on time · 15 min avg delay
Full BOS to SAN comparison →
Southwest Airlines on-time record across all routes →
58 Southwest Airlines flights tracked on this route; 2 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.