What the official source says, who checks it, and the cheapest flights out of the country if you need to book one.
United Kingdom
No official rule found
None of the official sources we checked mention an onward ticket.
“you’re able to pay for your return or onward journey (or have funding from someone else to pay for the journey)”
Source: UK Home Office · see the source · checked on 12 October 2026
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Onward ticket required · 12
May be asked for · 21
No official rule found · 6
Rules taken from official sources (governments, embassies), with their date. They change: check before you leave, and with your airline.