This bit of advice is the singular most important piece that a traveler can heed -- leave for the airport early. Even if you're the most seasoned traveler, other people's actions have way too much impact on your time to leave it to chance. The best way to avoid being delayed as a result of others' lack of consideration or incompetence as travelers is to give yourself plenty of time. Most airports have a variety of ways to spend your time while waiting, from shops, restaurants and bars to complimentary Wi-Fi and charging stations for your laptop. Leave early and avoid the stress of dealing with long lines and slow airline employees.