No.If you have a valid visa you are not required to be in possession of a round-trip or onward ticket.
People Also Ask
So while you can technically travel on a one-way ticket, they also need some kind of official return ticket confirmation showing that you are leaving the country eventually. They won't necessarily care where that ticket goes, just as long as it's out of their country.
Yes, it is important to have a return ticket booked when entering the US on a B1 visitor visa. This is because the US immigration authorities need to be sure that you will leave the country at some point and not stay in the US indefinitely.
The period of time a foreign national has to re-enter the US on a tourist visa depends on how long they stayed in the country. If their presence was 90 days or less, they will be able to return to the country again after leaving the US up to a maximum of 180 continuous days per year.
Requirements for British Citizens Travelling to the EUValid passport. Health insurance (such as private travel insurance or an EHIC/GHIC). Enough money to cover your stay in the EU. Return or onward travel ticket.
A return airline ticket or; Other evidence that you'll depart Greece if asked. U.S. official and diplomatic passport holders must obtain a Schengen visa before arrival. So if you're traveling on a U.S. official or diplomatic passport, you can't enter Greece without a visa.
Airlines may impose certain sanctions including invoicing an additional amount up to the standard fare of the one-way alternative, deletion of mileage programs, etc. But, the probability of this is minimal, because such a breach can only be identified after the flights have departed.