$59+ Cheap flights from St. Louis to Ontario (STL - ONT)

There are many flights that can get you from St. Louis to Ontario in 5h 38m. Fly via Frontier or American Airlines to get the fastest option. The distance between St. Louis and Ontario is about 1541 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

Frontier, at $130, was found to be the cheapest airline from St. Louis to Ontario.Alternate airlines to your destination round-trip include Delta and United Airlines. Frontier is priced at 62% lower than the current average price of a flight leaving 3 months from now.

The cheapest airline one-way is Frontier, with whom users have recently found tickets for as low as $82. However, be on the lookout for offers from American Airlines and Delta, as they are both options that can get you from St. Louis to Ontario for a low price.

Yes. In addition to deals on St. Louis to Ontario flights, Cheapflights offers vacation packages that include both flights and hotel.

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from St. Louis to Ontario.

Yes. Cheapflights offers flight deals from St. Louis to Ontario by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

Currently, November is the cheapest month in which you can book a flight from St. Louis to Ontario (average of $67). Flying from St. Louis to Ontario in June is currently the most expensive (average of $248). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.