Search, book & sell flights through the Duffel API

KLM is the flag carrier of the Netherlands and a member of SkyTeam. It currently flies to over 600 destinations in 150 countries around the world, and its main hub is located in Amsterdam. The Duffel Flights API is built from the ground up and allows you to search, book and sell flights from KLM along with 300+ other airlines through a single integration.







The future of flexibility

Supported API features

Search and Book Flights


New York


Search & Book

Search for flights from KLM and more than 20 other airlines with real-time pricing and availability.

Airline logo for KLM


Cancel & Refund

Make it easy for your customers to cancel bookings and get a timely refund without having to bounce between KLM and agents.

Docs coming soon

Airline logo for KLM


Paid Extras

Give your customers the ability to add bags on KLM - other services like extra leg room, priority boarding and in-flight meals are coming soon.

Docs coming soon


Seat Selection

Your customers want to decide where they sit. Duffel gives them the power to choose their seats using data sent directly from KLM.

Docs coming soon


Frequently Asked Questions

Haven’t found what you’re looking for? Try our API Documentation or Contact us.

What features are available on KLM through the Duffel API?

With Duffel, you can search, book, and manage flights. We also have a changes API coming soon that will enable you to change your KLM flights.

Soon, you will also be able to sell paid extras, like baggages and seat selection, through the Duffel API.

How does the Duffel API compare to KLM's API?

The KLM API offers similar functionality to Duffel, but only allows you to access content from KLM. If you want to offer content from other airlines, you would then need to integrate each individual airline's API, a process that is costly and time consuming. With Duffel, you integrate once, and get access to a network of 20+ of the world's leading airlines with just a single integration.

Duffel was also built with the developer in mind and offers simple, composable APIs, comprehensive documentation, and a robust testing environment. This means an integration takes minutes, not months. Check out our API Documentation here.