> you can totally show up 20 minutes before a flight I'm assuming you're talking about the scheduled boarding time, not departure time? Most airlines' contract

> you can totally show up 20 minutes before a flight I'm assuming you're talking about the scheduled boarding time, not departure time? Most airlines' contracts of carriage say that if you're not at the gate 15 minutes before departure, you'll be denied boarding. EDIT: I guess it's not clear whether you meant "show up [at the airport]" or "show up [at the gate]".