Flight OddsUA1831 ATL → IAD
United Airlines · Atlanta, GA to Washington, DC · 359 flights observed, 2025-07-01 to 2026-06-30 · 534 mi
UA1831 covers more than one route in the data window — the stats below are for ATL → IAD, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
78%
Median delay
-4 min
90th percentile
+84 min
Cancellation rate
1%
How often is UA1831 on time?
Across 359 flights on ATL → IAD from 2025-07-01 to 2026-06-30, UA1831 arrived within 15 minutes of schedule 78% of the time. The median arrival delay was -4 min, and the worst 10% of flights arrived +84 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 | 279 | 78% |
| 16-30 min | 20 | 6% |
| 31-60 min | 17 | 5% |
| 61-120 min | 18 | 5% |
| 2+ hrs | 22 | 6% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-07 | 30 | 60% | +64 min |
| 2025-08 | 28 | 82% | +19 min |
| 2025-09 | 30 | 70% | +31 min |
| 2025-10 | 31 | 87% | +8 min |
| 2025-11 | 30 | 70% | +14 min |
| 2025-12 | 29 | 72% | +19 min |
| 2026-01 | 29 | 76% | +11 min |
| 2026-02 | 28 | 93% | -1 min |
| 2026-03 | 30 | 73% | +13 min |
| 2026-04 | 30 | 83% | +6 min |
| 2026-05 | 31 | 90% | +9 min |
| 2026-06 | 30 | 83% | +45 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 52 | 83% |
| Tue | 52 | 85% |
| Wed | 52 | 83% |
| Thu | 52 | 79% |
| Fri | 51 | 71% |
| Sat | 46 | 83% |
| Sun | 51 | 67% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…