WN 490 then UA 2496 at Boston
Baltimore → Boston → Chicago O'Hare
Timetable, Boston time
11:10WN 490 from Baltimore at the gate
15:01UA 2496 to Chicago O'Hare leaves the gate
3 h 51 apart on the timetable
The last days
WN 490 and UA 2496 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.