You could stop over in Iceland for up to seven nights for free (in either direction, or both). Icelandair could even provide a free guide ("buddy") while in Iceland.
This is a great chance to visit Sweden, Norway or Denmark during springtime! Stockholm is considered to be among the most beautiful capitals in Europe. Walk along the streets and channels, visit the fantastic museums and dont miss the impressive Vasa, an entire ship that sank in 1628 and has been recovered and restored in 1961!
In Copenhagen say hello to the Little Mermaid, visit Tivoli amusement park, have a beer in Carlsberg brewery, and finally take your kids to the land of Lego!
You will be amazed with the museums of Oslo: learn more about Vikings, follow the path of polar explorers at Fram Museum, walk to Vigeland Park to see its statues. You can start your exploration of this northern country from Norwegian capital and go skiing at Holmenkollen!
Travel dates:
May June 2017
Sample dates
New York Gothenburg New York
May 11-19, 11-26, 14-26; 17 May-02 Jun, 24 May-02 Jun, 24 May-11 Jun, 30 May-12 Jun;Jun 1-16
New York Stockholm New York
May 11-21, 12-23, 12-28, 16-26, 18-30; 24 May-06 Jun, 29 May-06 Jun; Jun 1-12, 5-13, 6-16, 9-17, 11-20
New York Copenhagen New York
May 1-13, 7-17, 8-15, 8-20, 10-23, 10-30
New York Oslo New York
May 11-18, 11-23, 12-26, 15-28, 16-31; 22 May-04 Jun, 24 May-07 Jun; Jun 1-14, 2-15
http://www.fly4free.com/flight-deals/usa/spring-and-summer-new-york-to-scandinavia-from-just-314/