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That's the best price ew could find for select routes by at least $15. Buy Now at DealBase Tips On the DealBase landing page, click "KLM Royal Dutch Airlines" in the top line to see this sale. We found this price on flights departing from New York, NY (JFK) with arrival in Barcelona, Spain (BCN) on January 26 and return on February 3. All prices, dates, and booking details were valid at the time of publication. Book this travel deal by December 30 for travel from January 1 through June 30.