Southwest Airlines SFO to BOS on-time performance
Southwest Airlines nonstop flights from San Francisco to Boston · Aug 2025 – Jul 2026
On-time arrivals
0%
arrived < 15 min late
Cancelled
0.0%
0 flights
Avg arrival delay
49 min
49 min when late
Rank on route
#5 of 5
route average 76% on time
Key facts
- Southwest Airlines flights on SFO to BOS arrived on time 0% of the time in Aug 2025 – Jul 2026.
- 0% were cancelled, and 0% arrived an hour or more late.
- That ranks #5 of 5 airlines on this route, which averaged 76% on time overall.
- The largest source of delay minutes was airline (crew, maintenance, cleaning, fueling) (100%).
On-time trend by month
Monthly trend appears once two or more months of data are available.
Why this airline's flights were late
- Airline (crew, maintenance, cleaning, fueling)100%
- Late-arriving aircraft0%
- Air traffic control & airport congestion0%
- Extreme weather0%
- Security0%
Other airlines on SFO to BOS
- United Airlines79% on time · 16 min avg delay
- JetBlue73% on time · 22 min avg delay
- Delta Air Lines73% on time · 20 min avg delay
- Alaska Airlines78% on time · 15 min avg delay
Full SFO to BOS comparison →
Southwest Airlines on-time record across all routes →
1 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.