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Be sure when you are  searching for plane tickets, to get the best price if you are flexible. Consider flying into alternate cities and on alternate dates. A round-trip ticket from New York to Dublin can likely be cheaper than a round-trip ticket from New York to London, The two cities are located a quick ferry or a quick flight from each other. You might also consider flying  into one city and out of the other. This is particularly effective if you want to avoid the additional cost of traveling back to your arrival airport.

~Mike