How can park in LA airport (LAX) and catch my airplane?

I wonder how I can park in LAX and then catch my airplane? I need to park there for 4 days, how much would that cost? And then do I need to take a shuttle to the airport? Will that take a long time so I need to leave early?

Leave early.

There is shuttle.

Expect to pay $12-$20 a day for long term parking

More for closer short term parking

You can get long term parking free and airport shuttle free if you use the stay123 package for one night at an inexpensive hotel - ranging like $89 to $99- I use it all the time. you can use the hotel night before you leave so you can use the 24 hour hotel shuttle to the terminal (about 5 minutes) and catch your flight with no problem- or if you just want to drive there and fly out, you can use the hotel after you come back, or not at all, but you get the parking for no extra charge and shuttle back. Its a great service