🇺🇸 Cheap flights from London to Ontario (United States) for €463 round-trip

Flights from London to Ontario, United States from €463 round-trip by KLM! Find the cheapest flights from London to Ontario and book your ticket at the best price! Tickets to United States will cost from €463 both ways.

Ontario sits in California's Inland Empire, an easygoing base east of Los Angeles rather than a destination in its own right. The old downtown along Euclid Avenue has a walkable stretch of cafés and antique shops, and the surrounding valley grows citrus against a backdrop of the San Gabriel Mountains. October days stay warm and dry, and the location puts Joshua Tree, the coast, and LA within a straightforward drive.