WN 3439 then BA 7545 at San Francisco
Austin → San Francisco → Seattle
Timetable, San Francisco time
20:20WN 3439 from Austin at the gate
20:58BA 7545 to Seattle leaves the gate
38 min apart on the timetable
The last days
WN 3439 and BA 7545 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.