Get ready for your next trip with this complete 2025 guide to checking in with KLM Airlines. Learn how to use KLM’s online and mobile check-in tools to save time at the airport, understand deadlines for domestic and international flights, and find out what to expect when checking in at the airport counter or self-service kiosks. Whether you’re flying Economy or Business Class, this article ensures a stress-free KLM check-in experience.