Hotels.com cuts up to 40% off select hotel stays as part of its Memorial Day Sale. Plus, get an extra 12% off on select 3-night stays of $300 or more via coupon code "MEMSAVE12". That's one of the best extra percent-off discounts we've seen from Hotels.com. (We saw a flat 12% off in December.) Blackout dates and additional fees apply; several hotels are excluded. Book this travel deal by May 29 for travel from May 25 through May 30.

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