KLM offers five basic fare categories within our three travel classes:
Economy Class »
Europe Select (within Europe) »
World Business Class (Intercontinental) »

Europe
Economy (best prices)/ Take off fare:  Changes not allowed; no refund for cancellation; upgrade with Flying Blue miles not possible
Economy (flexible)/ Overnight fare:  Changes and cancellations are possible for a fee; upgrade with Flying Blue miles not possible
Same day return fare:  Changes and cancellations are possible for a fee; upgrade with Flying Blue miles is possible

Intercontinental
Economy (best prices)/ Take off fare:  Changes not allowed; no refund for cancellation; upgrade with Flying Blue miles not possible
Economy (flexible)/ Overnight fare: Min. stay varies per destination, from 1 Sat. night to 7 days; Changes and cancellation possible for a fee; upgrade with Flying Blue miles not possible
Full Flex Fare:  No minimum stay; Changes and cancellation are free of charge and unrestricted; upgrade with Flying Blue miles is possible

Europe Select/ Europe Select Fare:  No min. stay; Changes and cancellation are free of charge and unrestricted

Business (Best Prices)/ World Business Class Holiday Fare:  Min. stay varies per destination, from 1 Sat. night to 7 days; Changes and cancellations are possible for a fee
Business (Flexible)/ World Business Class Fare:  No min. stay; Changes and cancellation are free of charge and unrestricted