Airlines update gate changes and delays in their own systems long before the departure board catches up. A flight tracking app reads that data directly — which is how passengers often know about a delay before the announcement.
The catch is that all of them need a live connection to be useful. A tracker showing yesterday’s status is worse than no tracker at all. Below, what each app is actually good at, and how much data they use.
Quick verdict
Flightradar24 for watching, Flighty for flying.
If you want to see planes on a live map, Flightradar24 is the one. If you want to be told about your own delay before the airline announces it, Flighty is better — but it is iOS only.
All of them run on very little data: tracking a full flight costs a few megabytes. What they need is connectivity, which is exactly what you lose at an international layover.
The apps, compared
Flightradar24 is the best known, and the most satisfying to look at: a live world map with aircraft moving in real time, tap any plane for its route, altitude and speed. The free tier covers most needs. Its data comes largely from a volunteer network of ADS-B receivers, so coverage is excellent over Europe and North America and thinner over oceans and remote regions.
FlightAware is the more utilitarian option, and strongest in the United States, where it also draws on FAA data. If you want the status of a specific flight number rather than a map to explore, this is usually the faster route to an answer.
Flighty takes a different approach: instead of showing you every plane in the sky, it tracks only the flights you are on and pushes notifications — often flagging a delay before the gate agent announces it. It is polished, subscription-based and iOS and macOS only, which rules it out for Android users.
Plane Finder covers similar ground to Flightradar24 with a cleaner interface, and is a reasonable alternative if you find the latter cluttered.
FlightStats is less about live maps and more about historical performance: on-time records for a given route or airline. Useful when you are still choosing a flight rather than waiting for one.
How to get real-time alerts
- Add the flight number before you leave home, while you still have Wi-Fi. Most apps let you save a flight and start watching it days in advance.
- Turn on push notifications for gate changes, delays and baggage claim. This is the part people skip, and it is the whole point.
- Share the tracking link with whoever is picking you up, so they follow the real arrival time instead of texting you mid-flight.
- Keep data on during the layover. Alerts are useless if the phone is offline between flights — which is exactly when gates change.
How much data do they use?
Very little. Tracking a flight from departure to landing costs a few megabytes — far less than a single minute of video. Even the live map view, which refreshes constantly, is light compared with normal browsing.
The practical consequence: you do not need a big data plan for this. You need a connection at all. And a connection is precisely what disappears the moment you land in a country your carrier does not cover. Our data sizing guide puts these numbers in context against maps, social media and video.
Connectivity at a layover
This is where flight tracking actually earns its place. On a long-haul itinerary with a connection, the useful window is the ninety minutes between landing and your next boarding call — in an airport where your phone has no service and the free Wi-Fi wants an SMS code sent to a number that does not roam.
An international eSIM solves that: you install it at home, activate it on landing, and your tracker keeps pushing alerts through the layover. Your original SIM stays in the phone, so verification codes and WhatsApp keep working. If your route crosses several countries, a multi-country plan covers the whole trip on one profile.
Frequently asked questions
What is the best flight tracking app?
For a live map of aircraft in the sky, Flightradar24 is the most complete and works well on its free tier. For alerts about your own flight, Flighty is faster at flagging delays, though it only runs on iOS and macOS. FlightAware is the strongest option in the United States.
Are flight tracking apps free?
All of the major ones have functional free tiers. Paid plans add things like extended flight history, weather layers and ad removal. Flighty is the exception, built around a subscription.
How much data does a flight tracking app use?
Very little — a few megabytes to follow a full flight. It is one of the lightest things you can do with mobile data, well below social media or video streaming.
Do flight trackers work without internet?
Not meaningfully. They can show the last cached status, but the point of tracking is live updates on delays and gate changes. Without a connection you are looking at old information.
How do the apps know where a plane is?
Mostly through ADS-B, a signal aircraft broadcast with their position, altitude and speed. Networks of ground receivers — many run by volunteers — pick it up. Coverage is dense over Europe and North America and sparser over oceans, where satellite data fills the gaps.
How do I stay connected during an international layover?
An international eSIM is the simplest way: install it before you fly, activate on landing, and you have data through the connection without hunting for airport Wi-Fi or swapping your SIM card.
Alerts need a connection. Install your eSIM before you fly and activate on landing.