Air Europa has round-trip flights from New York/Newark (JFK/EWR) to Valencia or Malaga (VLC, AGP) for $404-$414 with a connection. Valencia flights July to November. Malaga flights in November only. Origin/Destination reversible.
Note: Some small OTAs on Skyscanner have this for about $375. If you plan on booking there, beware of any site that charges a fee to cancel a ticket within the 24-hour “free” period. Use unknown booking sites at your own risk.