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Cheap Flights from Los Angeles - Ontario Intl. to Lambert-St. Louis Intl. Prices were available within the past 7 days and starts at 64 for one-way flights andfor round trip, for the period specified. Prices and availability are subject to flightcrew.buzzation Airport: Lambert-St. Louis Intl. Flights from Ontario/LA (ONT) to St.

Louis (STL) Visit Gateway City and discover what St. Louis has to offer. Book flights from Ontario/LA to St. Louis with Southwest Airlines .

It’s easy to find the Ontario International Airport to Lambert-St. Louis International Airport flight to make your booking and travel a breeze.

Search by airline Frontier American Airlines.

Which airlines provide the cheapest flights from Ontario to St. Louis? In the last 72 hours, the cheapest one-way ticket from Ontario to St. Louis found on KAYAK was with Frontier forFrontier proposed a round-trip connection fromand American Airlines fromThe total flight duration time from Ontario (ONT) to Saint Louis (STL) is typically 7 hours 33 minutes.

This is the average non-stop flight time based upon historical flights for this route. During this period travelers can expect to fly about 2, miles, or 3, kilometers.

Get to St. Louis STL from Ontario ONT quicker with direct flights. Get to St. Louis faster, without the hassle of changing planes and moving baggage, by booking a direct flight. Expect your direct flight to STL from ONT to take around hour(s) min(s). Find our cheapest airfares for flights from Ontario ONT to St. Louis STL.