Flight OddsSTL → SEA Southwest Airlines
Southwest Airlines · St. Louis, MO to Seattle, WA · 103 flights, 2025-07-01 to 2026-06-30 · aggregated across 9 flight numbers
On-time arrival
54%
Median delay
+11 min
90th percentile
+40 min
Cancellation rate
0%
How on-time is Southwest Airlines from STL to SEA?
Across every Southwest Airlines flight number on STL → SEA (103 flights, 2025-07-01 to 2026-06-30), 54% arrived within 15 minutes of schedule. Median arrival delay +11 min; the worst 10% ran +40 min or later. 0% were cancelled.
Delay distribution
Arrival delay for completed flights (excludes cancellations and diversions).
| Arrival | Flights | Share |
|---|---|---|
| Early / on-time | 56 | 54% |
| 16-30 min | 28 | 27% |
| 31-60 min | 11 | 11% |
| 61-120 min | 4 | 4% |
| 2+ hrs | 4 | 4% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-07 | 31 | 55% | +16 min |
| 2025-08 | 23 | 61% | +19 min |
| 2025-09 | 21 | 71% | +4 min |
| 2026-06 | 28 | 36% | +32 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 17 | 76% |
| Tue | 9 | 67% |
| Wed | 8 | 75% |
| Thu | 18 | 50% |
| Fri | 17 | 29% |
| Sat | 17 | 41% |
| Sun | 17 | 59% |
WN flight numbers on STL → SEA
Related
Based on US DOT Bureau of Transportation Statistics on-time data. Loading the full breakdown…