As of 16th March 2021, the Dutch government has relaxed testing requirements for passengers travelling to and via Amsterdam. See the updated options below.

Transfer passengers

A negative Covid -19 PCR test not older than 72 hours before arrival in Amsterdam (rapid test no longer required)
 

Passengers travelling to Amsterdam have 2 options

A negative Covid -19 PCR test not older than 24 hours before boarding a flight to the Netherlands (if available)

OR

A negative PCR test not older than 72 hours before arrival to the Netherlands plus a rapid antigen test taken within 24 hours before boarding

For more information on Covid-19 government measures in the Netherlands, click here

Source: https://www.klm.com/travel/us_en/prepare_for_travel/up_to_date/flight_update/index.htm