Skip to main content
Beginning of main content

Cheap Flights from Ontario to St. Louis $290.62

Search over 321,000 hotels worldwide and 400 airlines worldwide.
Secure incredible value with Expedia's Price Guarantee.
No Expedia cancellation fee to change or cancel almost any hotel reservation.

Cheapest Flights from Ontario to St. Louis (ONT to STL)

Prices found within past 7 days. Prices and availability subject to change. Additional terms may apply.

Interesting Facts About Flights from Ontario to St. Louis (ONT to STL)

Question : If punctuality is required for you to book a flight, which airline is your best bet?
Answer : The current leader is NetJets Aviation with a 100% on-time rate. Don't spend more time waiting in an airport than you have to and stick with NetJets Aviation on this route. Hopefully they keep that perfect record alive.

Question : Do prices fluctuate more for this route than others?
Answer : Flight prices change less than most routes in the United States for ONT to STL. They range from $306 to $941. Prices tend to be lower the further out you book.

Question : Who's offering the cheapest round-trip flight to Lambert-St. Louis International Airport (STL) over the coming months?
Answer : United Airlines is the leader in keeping costs down for their passengers over the next three months. Fares are being booked at just $306, which is quite a deal when compared to the more expensive bookings of $941.

Question : How often is the LA/Ontario International Airport (ONT) to Lambert-St. Louis International Airport (STL) route delayed?
Answer : The Ontario to Saint Louis route has been excellent at getting passengers to their destination on time, with a 100% on-time rate.

Question : In terms of overall promptness, how does ONT to STL rank compared to the rest of the world?
Answer : ONT to STL currently scores 4 out of a possible 5 stars in promptness. This score combines both the number of delayed flights and total delay minutes. With 4 stars, you should feel confident in getting to Saint Louis on time.

Question : What day in the next four weeks has the best fares?
Answer : As of Mar 27th, the cheapest day to fly from Ontario to Saint Louis is Mar 28th. Tickets are currently being sold for $306, which is 23% below the average price for this route.

Question : Have you considered flying out of an airport besides LA/Ontario International Airport (ONT)?
Answer : Lucky for you, there is another airport near Ontario. John Wayne Airport (SNA) is 30 miles away, and over the next few months, flights are being booked 18% cheaper than flights from LA/Ontario International Airport.