Delta Air Lines SAN to BOS on-time performance
Delta Air Lines nonstop flights from San Diego to Boston · Aug 2025 – Jul 2026
On-time arrivals
80%
arrived < 15 min late
Cancelled
1.6%
6 flights
Avg arrival delay
19 min
85 min when late
Rank on route
#1 of 4
route average 77% on time
Key facts
- Delta Air Lines flights on SAN to BOS arrived on time 80% of the time in Aug 2025 – Jul 2026.
- 1.6% were cancelled, and 3% arrived an hour or more late.
- That ranks #1 of 4 airlines on this route, which averaged 77% on time overall.
- The largest source of delay minutes was airline (crew, maintenance, cleaning, fueling) (38%).
On-time trend by month
Why this airline's flights were late
- Airline (crew, maintenance, cleaning, fueling)38%
- Late-arriving aircraft34%
- Air traffic control & airport congestion28%
- Extreme weather1%
- Security0%
Other airlines on SAN to BOS
- JetBlue78% on time · 22 min avg delay
- Alaska Airlines78% on time · 16 min avg delay
- Southwest Airlines33% on time · 49 min avg delay
Full SAN to BOS comparison →
Delta Air Lines on-time record across all routes →
364 Delta Air Lines flights tracked on this route; 6 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.