Best airfares from Ontario to St Louis
Jetradar compares airfares from Ontario to St Louis with hundreds of airlines (including United Airlines, American Airlines, Alaska Airlines) and dozens of online travel agencies in one single place. We provide you with all the options to find the cheapest flights to St Louis, you choose where to book. Also there you can find airlines special offers from Ontario to St Louis. The cheapest round-trip price found within the last week was $237. The cheapest oneway price found within the last week was $135.Cheapest Flights from Ontario, CA to St Louis, MO
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Airline One Way One Way / Round-Trip Round-Trip 
United Airlines $209 $237 
American Airlines $242 $280 
Alaska Airlines $315 $342 
Frontier Airlines $242 $230 
Southwest Airlines Find $251 -
Airline One Way One Way / Round-Trip Round-Trip 
Great Lakes Airlines Find $576
Flights from Ontario to St Louis
Travelling from Ontario to St Louis advices and facts
- The distance between Ontario and St Louis is 1557 miles (or 2505 kilometers).
- The shortest flight time is 4h 58m
- When you fly from Ontario to St Louis, don't forget about the time difference. The time in St Louis is 02:00 from the Ontario time. The current time in St Louis is 07:45pm and 05:45pm in Ontario. Check this again shortly before your flight.