WN278 MDW → BOS

Southwest Airlines · Chicago, IL to Boston, MA · 42 flights observed, 2025-08-05 to 2025-10-01 · 861 mi

This flight runs much more reliably at some times of day than others — 94% on-time departing 9am–12pm vs. 33% departing 12–3pm.

WN278 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
60%
Median delay
+3 min
90th percentile
+58 min
Cancellation rate
0%

How often is WN278 on time?

Across 42 flights on MDW → BOS from 2025-08-05 to 2025-10-01, WN278 arrived within 15 minutes of schedule 60% of the time. The median arrival delay was +3 min, and the worst 10% of flights arrived +58 min or later. 0% of flights were cancelled.

Delay distribution

Arrival delay for completed flights (excludes cancellations and diversions).

ArrivalFlightsShare
Early / on-time2560%
16-30 min37%
31-60 min1024%
61-120 min37%
2+ hrs12%

Performance by month

MonthFlightsOn-timeAvg delay
2025-081968%+6 min
2025-092250%+29 min
2025-101100%-19 min

Performance by day of week

DayFlightsOn-time
Mon838%
Tue9100%
Wed989%
Thu838%
Fri825%
SatNo data—
SunNo data—

Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…