Flight OddsSFO → BOS United Airlines
United Airlines · San Francisco, CA to Boston, MA · 1,866 flights, 2025-07-01 to 2026-06-30 · aggregated across 21 flight numbers
On-time arrival
80%
Median delay
-9 min
90th percentile
+52 min
Cancellation rate
1%
How on-time is United Airlines from SFO to BOS?
Across every United Airlines flight number on SFO → BOS (1,866 flights, 2025-07-01 to 2026-06-30), 80% arrived within 15 minutes of schedule. Median arrival delay -9 min; the worst 10% ran +52 min or later. 1% were cancelled.
Delay distribution
Arrival delay for completed flights (excludes cancellations and diversions).
| Arrival | Flights | Share |
|---|---|---|
| Early / on-time | 1,469 | 80% |
| 16-30 min | 105 | 6% |
| 31-60 min | 109 | 6% |
| 61-120 min | 88 | 5% |
| 2+ hrs | 73 | 4% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-07 | 154 | 79% | +11 min |
| 2025-08 | 159 | 86% | +1 min |
| 2025-09 | 167 | 69% | +18 min |
| 2025-10 | 165 | 75% | +16 min |
| 2025-11 | 138 | 80% | +8 min |
| 2025-12 | 134 | 84% | +0 min |
| 2026-01 | 121 | 82% | 0 min |
| 2026-02 | 111 | 86% | 0 min |
| 2026-03 | 143 | 77% | +6 min |
| 2026-04 | 167 | 80% | -3 min |
| 2026-05 | 185 | 79% | -4 min |
| 2026-06 | 200 | 82% | -7 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 269 | 81% |
| Tue | 246 | 83% |
| Wed | 244 | 77% |
| Thu | 277 | 77% |
| Fri | 281 | 77% |
| Sat | 256 | 85% |
| Sun | 271 | 79% |
UA flight numbers on SFO → BOS
Related
Based on US DOT Bureau of Transportation Statistics on-time data. Loading the full breakdown…