WN 1900 then WN 4151 at Boston
Chicago Midway → Boston → Baltimore
Timetable, Boston time
11:35WN 1900 from Chicago Midway at the gate
18:20WN 4151 to Baltimore leaves the gate
6 h 45 apart on the timetable
The last days
WN 1900 and WN 4151 weren’t both flown 15 min to 12 h apart in the last 21 days.
Statistics from past flights, not live flight information. Always check times and your connection with your airline, and don’t base travel or booking decisions on these numbers.