When it comes to flying, checking in as early as possible—typically 24 hours before departure—can save you from unexpected travel headaches. While many travelers still wait until they’re at the airport to check in, doing it online in advance gives you key advantages: better seat selection, a lower chance of being bumped from an oversold flight, and in some cases, improved upgrade opportunities.

Early check-in is especially important if you’re traveling with checked baggage. Airlines and airports have strict cut-off times, often 45–60 minutes before departure, and missing that window could mean your luggage doesn’t make it onto the plane—even if you do. For international flights, the requirements are usually stricter, so it’s essential to review your airline’s specific policies in advance.

Even if you’ve already chosen your seat and aren’t checking a bag, checking in early ensures you can head straight to security when you arrive at the airport. Some airlines even offer automatic check-in services, like Southwest’s EarlyBird or Singapore Airlines’ auto check-in option, which add extra peace of mind.

While checking in online is highly recommended, most airports also provide backup options such as self-serve kiosks and curbside counters if you need to check in at the last minute. Still, early is always best—it helps reduce stress, saves time, and increases your chances of a smoother travel experience.