Flight OddsMDW → BOS Southwest Airlines
Southwest Airlines · Chicago, IL to Boston, MA · 1,381 flights, 2025-07-01 to 2026-06-30 · aggregated across 61 flight numbers
On-time arrival
68%
Median delay
0 min
90th percentile
+64 min
Cancellation rate
1%
How on-time is Southwest Airlines from MDW to BOS?
Across every Southwest Airlines flight number on MDW → BOS (1,381 flights, 2025-07-01 to 2026-06-30), 68% arrived within 15 minutes of schedule. Median arrival delay 0 min; the worst 10% ran +64 min or later. 1% were cancelled.
Delay distribution
Arrival delay for completed flights (excludes cancellations and diversions).
| Arrival | Flights | Share |
|---|---|---|
| Early / on-time | 931 | 68% |
| 16-30 min | 146 | 11% |
| 31-60 min | 144 | 11% |
| 61-120 min | 93 | 7% |
| 2+ hrs | 50 | 4% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-07 | 168 | 68% | +18 min |
| 2025-08 | 134 | 75% | +11 min |
| 2025-09 | 128 | 55% | +30 min |
| 2025-10 | 138 | 63% | +19 min |
| 2025-11 | 84 | 74% | +10 min |
| 2025-12 | 90 | 73% | +8 min |
| 2026-01 | 67 | 81% | +2 min |
| 2026-02 | 60 | 80% | +5 min |
| 2026-03 | 112 | 55% | +25 min |
| 2026-04 | 119 | 73% | +13 min |
| 2026-05 | 123 | 73% | +9 min |
| 2026-06 | 141 | 62% | +19 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 203 | 63% |
| Tue | 187 | 72% |
| Wed | 177 | 69% |
| Thu | 204 | 63% |
| Fri | 209 | 70% |
| Sat | 180 | 79% |
| Sun | 204 | 63% |
WN flight numbers on MDW → BOS
Related
Based on US DOT Bureau of Transportation Statistics on-time data. Loading the full breakdown…