April in the Netherlands centers on tulip season and important events like King’s Day (Koningsdag) at the end of the month, which brings vibrant street markets, widespread celebrations, and higher travel demand. These events can affect flights into Amsterdam Airport Schiphol (AMS), train capacity, and hotel availability—especially near Amsterdam city and popular destinations like Keukenhof Gardens. If traveling from San Francisco International Airport (SFO) to AMS in April, plan ahead by booking accommodations and ground transport early, and consider visiting mid-April for tulips with fewer crowds than during King’s Day. CTA: Check event dates and secure SFO to AMS flights and hotels in advance for April festivities.