The antonyms for "buys a one way ticket" can include "purchases a round trip ticket", "books a return ticket", "acquires a two-way ticket", "reserves a multi-city ticket", or "secures a flexible ticket". These alternatives imply that the person is making a more planned and organized travel arrangement, unlike buying a one-way ticket that suggests a spontaneous and unplanned itinerary. While a one-way ticket can provide flexibility, it may also result in higher expenses and potential immigration issues. Therefore, choosing antonyms of "buys a one-way ticket" enables a traveler to have a more structured and cost-effective journey.