KLM Online Reservations | Book Flights Tickets | Book Now KLM offers three different travel classes: Business Class, Economy Comfort Class, and Economy Class. Reservations for KLM are available for more than 145 cities in 70 nations on all continents. If you make a reservation for a seat and then change your flight, you can choose the same type of seat on your new flight without paying an additional fee. for more information please visit: https://flightsassistance.com/klm-reservations/. #KLMOnlineReservations #flightreservation #CheapFlightTicket #airlinetickets #cheapflights #flightbooking