I travel almost exclusively on one way tickets and get asked for an onward ticket, not a return ticket, every single time with the exception of Dubai. They dont seem to care. Everywhere else yes.I imagine most people travel on a single ticket containing both the outbound and return sets of flights, so this would be immediately apparent at check-in at the point of origin and therefore no need to ask overtly for the return flight details.
The carrier just wants to see an onward ticket to a third country so they have not let someone board who is likely to breach visa conditions in your next country.
If i dont actually have an onward ticket i usually buy a burner LCC ticket for the cheapest country available. No intention of ever using it. Almost always less than $50. Works fine.
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