Flight OddsWN4531 IAD → DEN
Southwest Airlines · Washington, DC to Denver, CO · 53 flights observed, 2026-01-06 to 2026-03-04 · 1,452 mi
WN4531 covers more than one route in the data window — the stats below are for IAD → DEN, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
81%
Median delay
+2 min
90th percentile
+26 min
Cancellation rate
2%
How often is WN4531 on time?
Across 53 flights on IAD → DEN from 2026-01-06 to 2026-03-04, WN4531 arrived within 15 minutes of schedule 81% of the time. The median arrival delay was +2 min, and the worst 10% of flights arrived +26 min or later. 2% of flights were cancelled.
Delay distribution
Arrival delay for completed flights (excludes cancellations and diversions).
| Arrival | Flights | Share |
|---|---|---|
| Early / on-time | 42 | 81% |
| 16-30 min | 6 | 12% |
| 31-60 min | 3 | 6% |
| 61-120 min | 1 | 2% |
| 2+ hrs | 0 | 0% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2026-01 | 21 | 71% | +7 min |
| 2026-02 | 27 | 85% | +2 min |
| 2026-03 | 4 | 100% | +2 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 8 | 75% |
| Tue | 9 | 89% |
| Wed | 9 | 67% |
| Thu | 8 | 88% |
| Fri | 8 | 63% |
| Sat | 3 | 100% |
| Sun | 7 | 100% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…