There have been some high-profile lawsuits with regards to hacker fares, but no as of this writing, no one has been successfully sued. Skiplagged was sued for promoting hacker fares to no avail. Airlines Lufthansa also tried to sue a Berlin passenger but the case was dumped (though it is now being appealed).  The likelihood for any traveler to face grave consequences (such as a lawsuit) for booking hidden city tickets is close to zero. Do note, however, that it's more likely to happen to a traveler who does it frequently. While getting sued is something to consider, the real risk of booking a hidden city ticket lies more on route changes and that you'll have to check luggage. If these things don't bother you, then you can save considerably with a hidden city fare.