WS 3750 then DL 3677 at Seattle
Calgary → Seattle → Spokane
Timetable, Seattle time
13:40WS 3750 from Calgary at the gate
19:51DL 3677 to Spokane leaves the gate
6 h 11 apart on the timetable
Seattle’s board gives a departure time for only about 59% of its flights, so many days show no gate time.
The last days
WS 3750 and DL 3677 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.