🇺🇸 Cheap flights from London to Ontario (United States) for €491 round-trip

Flights from London to Ontario, United States from €491 round-trip by Air France! Find the cheapest flights from London to Ontario and book your ticket at the best price! Tickets to United States will cost from €491 both ways.

Ontario sits in California's Inland Empire, east of Los Angeles at the foot of the San Gabriel Mountains, and it works best as a practical base rather than a headline stop. October brings dry, warm days and cooler evenings, good for driving out to the vineyards around nearby Rancho Cucamonga or heading up into the mountains. The old downtown along Euclid Avenue has a handful of cafés, and the desert and coast are both within easy reach.