Flight OddsUnited Airlines · San Francisco, CA to Washington, DC · 303 flights observed, 2025-07-01 to 2026-05-20 · 2,418 mi
UA1870 covers more than one route in the data window — the stats below are for SFO → IAD, the one it has flown most recently. The others are linked under “Other routes”.
How often is UA1870 on time?
Across 303 flights on SFO → IAD from 2025-07-01 to 2026-05-20, UA1870 arrived within 15 minutes of schedule 86% of the time. The median arrival delay was -9 min, and the worst 10% of flights arrived +26 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 | 258 | 86% |
| 16-30 min | 17 | 6% |
| 31-60 min | 16 | 5% |
| 61-120 min | 6 | 2% |
| 2+ hrs | 3 | 1% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-07 | 31 | 68% | +20 min |
| 2025-08 | 30 | 83% | +1 min |
| 2025-09 | 30 | 70% | +6 min |
| 2025-10 | 31 | 87% | -6 min |
| 2025-11 | 29 | 86% | -3 min |
| 2025-12 | 16 | 100% | -17 min |
| 2026-01 | 25 | 100% | -12 min |
| 2026-02 | 28 | 96% | -15 min |
| 2026-03 | 30 | 90% | -10 min |
| 2026-04 | 30 | 83% | -15 min |
| 2026-05 | 20 | 95% | -14 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 41 | 95% |
| Tue | 45 | 98% |
| Wed | 44 | 82% |
| Thu | 42 | 86% |
| Fri | 43 | 79% |
| Sat | 43 | 81% |
| Sun | 42 | 81% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…