Flight OddsWN3521 MDW → BOS
Southwest Airlines · Chicago, IL to Boston, MA · 4 flights observed, 2026-06-07 to 2026-06-28 · 861 mi
WN3521 covers more than one route in the data window — the stats below are for MDW → BOS, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
25%
Median delay
+36 min
90th percentile
+106 min
Cancellation rate
0%
How often is WN3521 on time?
Across 4 flights on MDW → BOS from 2026-06-07 to 2026-06-28, WN3521 arrived within 15 minutes of schedule 25% of the time. The median arrival delay was +36 min, and the worst 10% of flights arrived +106 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 | 1 | 25% |
| 16-30 min | 0 | 0% |
| 31-60 min | 2 | 50% |
| 61-120 min | 0 | 0% |
| 2+ hrs | 1 | 25% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2026-06 | 4 | 25% | +53 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 | No data | — |
| Sun | 4 | 25% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…