American Airlines, United Airlines and Expedia have round trip airfares travelling to and from Phoenix (PHX) and Houston (IAH) for $ 117, nonstop. On American Airlines, the fare type is main cabin, regular economy that includes seat selection, 1 personal item, 1 carry-on bag and free change (fare difference applies). On United’s basic economy fare, you’re only allowed one small personal item and free change (fare difference applies). There is no seat selection or free carry-on bag.