Comic-Con International for 2018 runs from July 19-22 with a Preview Night on July 18. If you already have a badge or are darned sure you're going to get one, you might be interested in the Early Bird Hotel Sale which is now on. It's for lodging in hotels that are generally cheaper because they're some distance from where all the action takes place…but most are reachable by shuttles. Read all about it here.
And a reminder: I am not your best source for info on the convention and when to sign up and how and stuff like that. I may miss vital info. Your best source is to keep your eye on this here page.