Does your favorite airfare search site or app show you all airfares? Probably not. Many consumers don't realize that the airfare search apps and online travel agencies they're using don't show Delta or Southwest Airlines, which together control over 35 percent of U.S. domestic air travel. Check this list in order to be a better-informed airfare shopper.
CheapOAir: No Delta or Southwest.
Expedia: No Southwest.
Google Flights: No Southwest.
Hipmunk: No Delta or Southwest.
Hopper: No Delta or Southwest.
JustFly: No Delta or Southwest.
Kayak: No Southwest.
Orbitz: No Southwest.
Priceline: No Southwest.
Skyscanner: No Delta; Southwest via a travel agency that charges higher prices.
Travelocity: No Southwest.
Trip Advisor Flights: No Delta or Southwest.