A popular travel hacking technique, throwaway ticketing is where a traveler, only intending to travel one way, buys a round trip ticket that is cheaper than the intended one way ticket alone. Then, the other half of the ticket is simply not used, or “thrown away.”
Throwaway ticketing won’t get you in as much trouble as back-to-back ticketing, but it is advised that travelers wishing to use this form of ticketing use the first leg; you can almost never fly the second leg of a roundtrip ticket without first flying the first leg.
Though it is in more of a gray area, airlines may still seek to penalize you if they become wise to it; better to be safe by researching the fine print, or not trying it at all.
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