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Southwest is one of the most popular low fare airlines in the United States. It operates more than 3,300 flights per day, ensuring that you get where you need to go for less. As the nation's largest carrier of domestic passengers, Southwest takes travel to a higher level with outstanding customer service throughout each of its current 72 destinations. Use the Southwest Airlines promo codes below to save even more off your next flight. For more savings, check out our discounted gift cards for Southwest.