Delta Air Lines BOS to SFO on-time performance
Delta Air Lines nonstop flights from Boston to San Francisco · Aug 2025 – Jul 2026
On-time arrivals
71%
arrived < 15 min late
Cancelled
1.5%
14 flights
Avg arrival delay
20 min
63 min when late
Rank on route
#3 of 5
route average 72% on time
Key facts
- Delta Air Lines flights on BOS to SFO arrived on time 71% of the time in Aug 2025 – Jul 2026.
- 1.5% were cancelled, and 8% arrived an hour or more late.
- That ranks #3 of 5 airlines on this route, which averaged 72% on time overall.
- The largest source of delay minutes was air traffic control & airport congestion (43%).
On-time trend by month
Why this airline's flights were late
- Air traffic control & airport congestion43%
- Late-arriving aircraft30%
- Airline (crew, maintenance, cleaning, fueling)26%
- Extreme weather0%
- Security0%
Other airlines on BOS to SFO
- United Airlines75% on time · 18 min avg delay
- JetBlue69% on time · 22 min avg delay
- Alaska Airlines60% on time · 29 min avg delay
- Southwest Airlines100% on time · 7 min avg delay
Full BOS to SFO comparison →
Delta Air Lines on-time record across all routes →
918 Delta Air Lines flights tracked on this route; 14 cancelled, 3 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.