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https://supportcommunity.milestonesys.com/s/question/0D5bH00000ZGHovSAH/southwest-cheapestfaqswhat-is-the-cheapest-day-to-buy-southwest-airline-ticketshttps://supportcommunity.milestonesys.com/s/question/0D5bH00000ZGHovSAH/southwest-cheapestfaqswhat-is-the-cheapest-day-to-buy-southwest-airline-tickets