There is an In-n-Out right near the entrance to LAX, the address is 9149 S Sepulveda Blvd

http://www.in-n-out.com/locations.as...us=10&x=37&y=2

If you are returning from SB on the 405 take the exit for La Tijera Blvd and make a right. Go about 1 mile and make a left on Sepulveda and it's right there. To get back to your hotel, make a right on Sepulveda then a left on Century