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Icelandair and Play fly JFK-KEF year-round; fares are often the cheapest nonstop from the US to Europe thanks to Keflavik's stopover program.
Build this tripNonstop flights typically take around 5h 30m, though routings with a layover can add 3-6 hours.
Round-trip economy fares typically range from $350 to $700, depending on season and how far in advance you book.
June-August for midnight sun; September-March for northern lights. Avoid peak weeks around major holidays if you're price-sensitive.