Join Date: Aug 2011
Location: Barcelona, London, on a plane
Programs: IB+ Gold, TK E+, Hyatt Globalist, Marriott LTP, IHG Diamond
Posts: 14,170
Yes, but you're not booking directly with Vueling, you're asking Iberia to book an unnamed "extra seat" on a partner airline.
Which makes me wonder whether it's legal to charge departure taxes and airport charges on empty seats, but that's another discussion...