For travel over Memorial Day Weekend, fly nonstop from Denver to Houston for $213 roundtrip on Southwest.
I found seats departing Denver DEN on Friday night, May 24, returning from Houston HOU on Tuesday morning, May 28.
You'll find lower fares available for non-holiday travel.
This fare includes a carry-on bag, a small personal item, and two free checked bags.
Southwest has an open seating policy, which means there are no assigned seats and you'll get to choose your seat during boarding. The order of boarding is determined by the time of check-in so check-in exactly 24 hours before departure or pay for priority boarding for a better choice of seat.
United is selling a standard Economy fare for the same dates and similar flight times from Denver to Houston-Intercontinental Airport (IAH) for $223 roundtrip. United's standard Economy fare includes a carry-on bag, personal item, and advanced seat assignments, but does not include any checked bags.
United's Basic Economy fare is $163 roundtrip, but this price only includes a small personal item. A full-size carry-on bag is not allowed and must be checked. United's Basic Economy also doesn't include advanced seat assignments and does not allow ticket changes or upgrades. A checked bag is $30 each way on either of United's fares.
Need a room in Houston? Here's what's available for the Memorial Day Weekend dates on Hotelwatchdog.