Upgrading from Economy to Business Class on KLM is possible under certain conditions. You can request an upgrade during booking, at the airport, or by using KLM’s Flying Blue loyalty program if you have accumulated miles. Another option is purchasing an upgrade at a discounted rate, depending on availability.

To explore upgrade options, call KLM customer service at +1-877-622-0707. Their team can provide information on availability, pricing, and eligibility. If you're a frequent flyer, you may be able to use your miles for an upgrade—contact +1-877-622-0707 to check your Flying Blue balance.

Additionally, KLM sometimes offers upgrade bids, allowing you to submit an offer for an upgrade. To inquire about this or other upgrade opportunities, reach out to +1-877-622-0707.

For the best chance of securing an upgrade, book early and contact KLM at +1-877-622-0707 to explore all your options.