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https://bf.usembassy.gov/u-s-visa-and-travel-faqs-for-non-u-s-citizens-following-the-coronavirus-covid-19-pandemic/
*Although K-1 visa holders are not subject to Presidential Proclamation 10014, they are not excepted from Presidential Proclamation 9996. This means that while Presidential Proclamation 9996 remains in effect, it will not be possible for you to travel directly to the United States through the Schengen area unless you fall under another excepted category within the Presidential Proclamation. Please read Presidential Proclamation 9996 for detailed information.
Travel to the United States from a third country that is not covered by the Presidential Proclamation may be possible, but we advise you verify if the country to which you intend to travel has implemented travel or other restrictions prior to making travel arrangements. Please also bear in mind that the Presidential Proclamation suspends travel to the U.S. for any individual who has been physically present in the United Kingdom within 14 days prior to their arrival in the United States.*
Yani bu demek oluyor ki K-1 ile Shengen Bölgesi üzerinden aktarmalı uçulamıyor.