WN 259 then WN 4673 at Boston
St Louis → Boston → Baltimore
Timetable, Boston time
23:35WN 259 from St Louis at the gate
08:40WN 4673 to Baltimore leaves the gate
9 h 05 apart on the timetable, overnight
The last days
WN 259 and WN 4673 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.