WS 1542 then UA 3918 at Houston
Calgary → Houston → Dallas-Fort Worth
Timetable, Houston time
13:00WS 1542 from Calgary at the gate
21:00UA 3918 to Dallas-Fort Worth leaves the gate
8 h apart on the timetable
The last days
WS 1542 and UA 3918 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.