Flight OddsWN4539 DEN → BUF
Southwest Airlines · Denver, CO to Buffalo, NY · 10 flights observed, 2025-07-05 to 2025-08-03 · 1,359 mi
WN4539 covers more than one route in the data window — the stats below are for DEN → BUF, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
60%
Median delay
+12 min
90th percentile
+20 min
Cancellation rate
0%
How often is WN4539 on time?
Across 10 flights on DEN → BUF from 2025-07-05 to 2025-08-03, WN4539 arrived within 15 minutes of schedule 60% of the time. The median arrival delay was +12 min, and the worst 10% of flights arrived +20 min or later. 0% of flights were cancelled.
Delay distribution
Arrival delay for completed flights (excludes cancellations and diversions).
| Arrival | Flights | Share |
|---|---|---|
| Early / on-time | 6 | 60% |
| 16-30 min | 4 | 40% |
| 31-60 min | 0 | 0% |
| 61-120 min | 0 | 0% |
| 2+ hrs | 0 | 0% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-07 | 8 | 63% | +7 min |
| 2025-08 | 2 | 50% | +14 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | No data | — |
| Tue | No data | — |
| Wed | No data | — |
| Thu | No data | — |
| Fri | No data | — |
| Sat | 5 | 60% |
| Sun | 5 | 60% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…