Flight OddsUA635 SFO → BOS
United Airlines · San Francisco, CA to Boston, MA · 4 flights observed, 2026-04-06 to 2026-04-27 · 2,704 mi
UA635 covers more than one route in the data window — the stats below are for SFO → BOS, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
75%
Median delay
-14 min
90th percentile
+27 min
Cancellation rate
0%
How often is UA635 on time?
Across 4 flights on SFO → BOS from 2026-04-06 to 2026-04-27, UA635 arrived within 15 minutes of schedule 75% of the time. The median arrival delay was -14 min, and the worst 10% of flights arrived +27 min or later. 0% of flights were cancelled.
Delay distribution
Arrival delay for completed flights (excludes cancellations and diversions).
| Arrival | Flights | Share |
|---|---|---|
| Early / on-time | 3 | 75% |
| 16-30 min | 0 | 0% |
| 31-60 min | 1 | 25% |
| 61-120 min | 0 | 0% |
| 2+ hrs | 0 | 0% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2026-04 | 4 | 75% | -7 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 4 | 75% |
| Tue | No data | — |
| Wed | No data | — |
| Thu | No data | — |
| Fri | No data | — |
| Sat | No data | — |
| Sun | No data | — |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…