# Free Public Transport and Flight APIs

Page: https://free-web-services.com/web-services/open-data/transport/

Transport APIs give public transport status, departures and journey planning, and live positions of aircraft. Use them to show the next trains at a station, plan a trip or put planes on a map.

## Services

| Service | API key | Formats | Free use |
|---|---|---|---|
| [Entur Journey Planner API](https://free-web-services.com/web-services/open-data/transport/entur-journey-planner-api.md) | Not needed | JSON | Free, no key needed; the data is under the Norwegian Licence for Open Government Data (NLOD). |
| [OpenSky Network API](https://free-web-services.com/web-services/open-data/transport/opensky-network-api.md) | Not needed | JSON | Free; anonymous users get 400 credits a day and the latest positions only, and a free account gives 4,000 credits a day and the last hour. |
| [TfL Unified API](https://free-web-services.com/web-services/open-data/transport/tfl-unified-api.md) | Not needed | JSON | Free; it works without a key, and a free key raises the limit. |

## Questions

**Which free public transport and flight APIs work without an API key?**  
Entur Journey Planner API, OpenSky Network API and TfL Unified API work without a key, according to their documentation. Most keyless services ask you to keep the number of requests reasonable, and some ask for a User-Agent that names your app.

**Are these public transport and flight APIs really free?**  
The services here can be used without paying, at least on a free plan or free tier, often with limits such as a number of requests per day or non-commercial use only. The table above quotes what each service says about its free use; check the provider's own terms before you rely on it.

**How up to date is this list?**  
The address of every service is checked about once a week, and services that stop working or stop being free are removed. This list last changed on November 8th, 2026.