WS 1540 then UA 3914 at Houston
Calgary → Houston → Dallas-Fort Worth
Timetable, Houston time
22:15WS 1540 from Calgary at the gate
08:00UA 3914 to Dallas-Fort Worth leaves the gate
9 h 45 apart on the timetable, overnight
The last days
WS 1540 and UA 3914 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.