Flight OddsUA2340 SFO → SEA
United Airlines · San Francisco, CA to Seattle, WA · 122 flights observed, 2025-12-18 to 2026-05-20 · 679 mi
UA2340 covers more than one route in the data window — the stats below are for SFO → SEA, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
84%
Median delay
-9 min
90th percentile
+25 min
Cancellation rate
1%
How often is UA2340 on time?
Across 122 flights on SFO → SEA from 2025-12-18 to 2026-05-20, UA2340 arrived within 15 minutes of schedule 84% of the time. The median arrival delay was -9 min, and the worst 10% of flights arrived +25 min or later. 1% of flights were cancelled.
Delay distribution
Arrival delay for completed flights (excludes cancellations and diversions).
| Arrival | Flights | Share |
|---|---|---|
| Early / on-time | 102 | 84% |
| 16-30 min | 11 | 9% |
| 31-60 min | 4 | 3% |
| 61-120 min | 2 | 2% |
| 2+ hrs | 2 | 2% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-12 | 14 | 79% | +5 min |
| 2026-01 | 31 | 94% | -7 min |
| 2026-02 | 28 | 96% | -12 min |
| 2026-03 | 27 | 96% | -11 min |
| 2026-04 | 1 | 100% | -6 min |
| 2026-05 | 20 | 40% | +20 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 17 | 88% |
| Tue | 17 | 76% |
| Wed | 17 | 82% |
| Thu | 18 | 83% |
| Fri | 17 | 82% |
| Sat | 18 | 94% |
| Sun | 17 | 82% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…