Upvote:0
Whether you booked your ticket under one leg or different tickets for both the legs, if the terminal is different, you have to check-out & check-in again to catch your next flight.
It's the case for both domestic & international flights.
Tips:
This wikihow article can be worth to read: https://www.wikihow.com/Switch-Flights-in-LAX
Upvote:6
There is no air-side transfer between terminals 1 and 4, so you must exist and re-enter passing through security. Even if you had checked bags, it would make no difference in this case.
Upvote:14
Yes, you will. This isn't because of any aviation or security laws, but simply because Southwest's terminal at LAX (Terminal 1) isn't connect to any of the other terminals airside (post-security). You'll need to walk or take the shuttle to Terminal 4 or 5. You could also probably reclear security at the TBIT, but those security lines are horrendous. Best (usually) to go to Terminal 4.