Yes, you can absolutely book KLM flights using Delta SkyMiles, as both airlines are founding members of the SkyTeam alliance. In 2026, this remains one of the most popular ways to use SkyMiles for trans-Atlantic travel, particularly for flights connecting through KLM's massive hub at Amsterdam Schiphol (AMS). You can search for and book these flights directly on Delta’s website or mobile app by selecting the "Shop with Miles" option. It is important to note that while "Partner Award" availability is often more limited than Delta’s own flights, you can sometimes find better value on KLM metal, especially in their "Premium Comfort" or "World Business Class" cabins. While Delta does not pass on the heavy fuel surcharges that some other European carriers do, it is a peer-to-peer reality that "Saver" level awards have become rarer, so using a flexible date search is essential to finding the best deals.