Originally Posted by
KLflyerRalph
From the website, contact info for US:
KLM Service Centre
For questions about a reservation you made at our website or to change or cancel an online reservation. Also for questions about online check-in or for contacting us in the event of technical problems at our website. Tel: 1-866-434-0320
Opening hours: 7 days a week 08:00 am - 7.30 pm(EST)
Note: Outside these opening hours, you can contact Delta/KLM reservations at 1-800-618-0104.
KLM Telephone Reservations
For making a reservation by phone or if you want to change or cancel an existing reservation. For questions about a reservation you made at our website, please contact the KLM Service Centre. Tel: 1-800-618-0104