DL 3764 then DL 3754 at Seattle
Vancouver → Seattle → Spokane
Timetable, Seattle time
08:45DL 3764 from Vancouver at the gate
11:00DL 3754 to Spokane leaves the gate
2 h 15 apart on the timetable
Seattle’s board gives a departure time for only about 56% of its flights, so many days show no gate time.
The last days
DL 3764 and DL 3754 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.