Oneworld Alliance partner Finnair flies nonstop New York JFK to Helsinki, Finland. Today Finnair has $379 round trip tickets for JFK-Helsinki and $437 round trip to Stockholm via Helsinki January to May. These destinations can also be booked as American Airlines or British Airways flights for same price or $20 to $30 more.
Finnair New York JFK – Helsinki HEL – New York JFK
American Airlines New York JFK – Helsinki HEL – Stockholm ARN – HEL – JFK