EDISON - Booking a round-trip, multidestination ticket can cost fliers much more than booking one-way tickets, and a senator is calling for an investigation.

U.S. Sen. Bob Menendez (D-New Jersey) is urging the U.S. Department of Transportation to investigate what he says are unfair and deceptive pricing practices used by United, Delta and American Airlines.

During a news conference, Menendez cited an example in which travelers who visited multiple destinations were charged hundreds more dollars for round-trip tickets versus one-way fares for the same flights.

Menendez believes the problem stems from a change in disclosure practices that many airlines adopted last month for flight itineraries that include multiple cities.

A spokesperson for Airlines for America issued a statement to News 12 New Jersey that says, "Customers today are able to choose among carriers and select the best prices, flight offerings and amenities that meet their individual needs.” 

The statement continued, “As with any consumer product, it’s the marketplace that ultimately determines the price and service offerings. The value of air travel is clear: we are seeing the highest number of people flying since the Great Recession."