Flight OddsWN4583 IAD → DEN
Southwest Airlines · Washington, DC to Denver, CO · 55 flights observed, 2026-01-06 to 2026-03-04 · 1,452 mi
WN4583 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
85%
Median delay
-6 min
90th percentile
+25 min
Cancellation rate
4%
How often is WN4583 on time?
Across 55 flights on IAD → DEN from 2026-01-06 to 2026-03-04, WN4583 arrived within 15 minutes of schedule 85% of the time. The median arrival delay was -6 min, and the worst 10% of flights arrived +25 min or later. 4% of flights were cancelled.
Delay distribution
Arrival delay for completed flights (excludes cancellations and diversions).
| Arrival | Flights | Share |
|---|---|---|
| Early / on-time | 45 | 85% |
| 16-30 min | 4 | 8% |
| 31-60 min | 1 | 2% |
| 61-120 min | 2 | 4% |
| 2+ hrs | 1 | 2% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2026-01 | 24 | 92% | -7 min |
| 2026-02 | 25 | 80% | +0 min |
| 2026-03 | 4 | 75% | +31 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 7 | 100% |
| Tue | 9 | 89% |
| Wed | 9 | 78% |
| Thu | 8 | 88% |
| Fri | 8 | 100% |
| Sat | 5 | 80% |
| Sun | 7 | 57% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…