🇺🇸 Cheap flights from London to Ontario (United States) for €480 round-trip

Flights from London to Ontario, United States from €480 round-trip by Air Canada! Find the cheapest flights from London to Ontario and book your ticket at the best price! Tickets to United States will cost from €480 both ways.

Ontario sits in California's Inland Empire, an easygoing base east of Los Angeles where the San Gabriel Mountains rise on the northern horizon, often snow-dusted by December while the valley stays mild and dry. The old downtown along Euclid Avenue keeps its tree-lined median and low brick storefronts, and vineyards once covered these plains. It works best as a practical launch point for wider Southern California road trips rather than a destination in itself.