F9 2561 then UA 4000 at Houston
Tampa → Houston → Harlingen
Timetable, Houston time
11:02F9 2561 from Tampa at the gate
14:40UA 4000 to Harlingen leaves the gate
3 h 38 apart on the timetable
The last days
F9 2561 and UA 4000 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.