Alaska Airlines SFO to BOS on-time performance
Alaska Airlines nonstop flights from San Francisco to Boston · Aug 2025 – Jul 2026
On-time arrivals
78%
arrived < 15 min late
Cancelled
0.6%
1 flights
Avg arrival delay
15 min
63 min when late
Rank on route
#2 of 5
route average 76% on time
Key facts
- Alaska Airlines flights on SFO to BOS arrived on time 78% of the time in Aug 2025 – Jul 2026.
- 0.6% were cancelled, and 9% arrived an hour or more late.
- That ranks #2 of 5 airlines on this route, which averaged 76% on time overall.
- The largest source of delay minutes was air traffic control & airport congestion (55%).
On-time trend by month
Why this airline's flights were late
- Air traffic control & airport congestion55%
- Airline (crew, maintenance, cleaning, fueling)29%
- Late-arriving aircraft16%
- 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
- Southwest Airlines0% on time · 49 min avg delay
Full SFO to BOS comparison →
Alaska Airlines on-time record across all routes →
173 Alaska Airlines flights tracked on this route; 1 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.