BA/AA: HEL-LHR-MIA-MVD (Montevideo) return in J 2004 EUR
BA/AA: HEL-LHR-MIA-MVD (Montevideo) return 2004 EUR in Jan 2017.
Available at least via google.com/flights, links to booking on AA.com. You need to add MIA (stop-over possible) to the routing yourself to find the price.
Possible to take AY A350 to LHR, BA A380 to MIA and then it's AA A767 to MVD. Similar price also from OSL.