Southwest Airlines' New Routes Are Slashing Flight Prices—And Your Wallet Could Be the Biggest Winner. Starting this month, the airline is adding 10 new nonstop destinations, including popular vacation spots like Cancun and San Juan, forcing competitors to drop fares by up to 40%. Consumer advocates say passengers on these routes should book immediately to lock in savings, but warn that hidden fees for bags and seat selection could eat into the discounts if you're not careful. One traveler told us her roundtrip to Phoenix dropped from $700 to $380 overnight, but she still paid $60 for a carry-on. The takeaway: these new routes mean more choices and lower base prices, but check the fine print before you click 'book' on that cheap fare.