Flight OddsSEA → MDW Southwest Airlines
Southwest Airlines · Seattle, WA to Chicago, IL · 678 flights, 2025-07-01 to 2026-06-30 · aggregated across 30 flight numbers
On-time arrival
81%
Median delay
-6 min
90th percentile
+32 min
Cancellation rate
1%
How on-time is Southwest Airlines from SEA to MDW?
Across every Southwest Airlines flight number on SEA → MDW (678 flights, 2025-07-01 to 2026-06-30), 81% arrived within 15 minutes of schedule. Median arrival delay -6 min; the worst 10% ran +32 min or later. 1% were cancelled.
Delay distribution
Arrival delay for completed flights (excludes cancellations and diversions).
| Arrival | Flights | Share |
|---|---|---|
| Early / on-time | 546 | 81% |
| 16-30 min | 53 | 8% |
| 31-60 min | 49 | 7% |
| 61-120 min | 20 | 3% |
| 2+ hrs | 2 | 0% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-07 | 85 | 69% | +8 min |
| 2025-08 | 88 | 68% | +7 min |
| 2025-09 | 86 | 71% | +8 min |
| 2025-10 | 33 | 97% | -9 min |
| 2025-11 | 29 | 97% | -12 min |
| 2025-12 | 31 | 94% | -8 min |
| 2026-01 | 31 | 100% | -7 min |
| 2026-02 | 28 | 100% | -16 min |
| 2026-03 | 56 | 95% | -14 min |
| 2026-04 | 60 | 80% | +0 min |
| 2026-05 | 62 | 90% | -5 min |
| 2026-06 | 81 | 75% | +9 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 98 | 83% |
| Tue | 101 | 82% |
| Wed | 98 | 85% |
| Thu | 97 | 75% |
| Fri | 97 | 77% |
| Sat | 89 | 90% |
| Sun | 90 | 79% |
WN flight numbers on SEA → MDW
Related
Based on US DOT Bureau of Transportation Statistics on-time data. Loading the full breakdown…