I see some fares in the $840-$950 range for two-three week stays, mostly outbound the last few days of May and first couple of June, but some fares are good for departures on a few days in mid June. I think Barcelona was the cheapest round trip fare I saw, but there were some good openjaws using London & Brussels, Barcelona & Paris, and Barcelona & Rome. You’ll have to play around with ITA or use flexible dates searches with various city pairs on other sites.