AS 2148 then DL 1880 at Seattle
Billings → Seattle → Spokane
Timetable, Seattle time
13:16AS 2148 from Billings at the gate
19:55DL 1880 to Spokane leaves the gate
6 h 39 apart on the timetable
Seattle’s board gives a departure time for only about 58% of its flights, so many days show no gate time.
The last days
AS 2148 and DL 1880 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.