New York is typically 6 hours behind Oslo. When it's 6:00 PM in Oslo, it's 12:00 PM in New York. Both cities observe DST but on different schedules.
During the brief DST transition weeks (2-3 weeks in March and November), the difference can be 5 or 7 hours. Norway uses CET/CEST, New York uses EST/EDT.
Optimal window: 8:00 AM - 11:00 AM New York time (2:00 PM - 5:00 PM Oslo). Morning New York catches afternoon Oslo.
Norwegian Air operated one of the first transatlantic low-cost routes between the US and Scandinavia. SAS and United also serve this route with strong business demand.