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Southwest Airlines Vacations takes up to $50 off select Las Vegas flight and hotel packages of $800 or more via coupon code "MARLAS". ($10 is deducted per night with a 5-night maximum stay.) That's among the best dollar-off discounts we've seen from Southewest Vacations this year. Some conditions, restrictions, and blackout dates apply. Book this travel deal by March 31 for travel March 19 through October 31.