Cheap Delta flights from Ontario to St. Louis (ONT to STL)

Discover our best Delta flight from Ontario ONT to St. Louis STL 

To find the best deals on flights to Ontario from St. Louis with Delta, just enter your travel dates, filter by Delta, and hit search. You’ll find flights to choose from and can sort by price, flight duration, and arrival or departure time.  

Return flights from Ontario ONT to St. Louis STL with Delta 

If you’re planning a round trip, booking return flights with Delta is usually the most cost-effective option. With airfares ranging from $344 to $344, it’s easy to find a flight that suits your budget. Prices and availability subject to change. Additional terms may apply. 

Book one-way Delta flights from Ontario ONT to St. Louis STL 

A one-way ticket gives you much greater flexibility—allowing you to choose your return date, destination, and time whenever you’re ready. By booking in advance you can find great deals on one-way tickets too. Right now, a one-way Delta flight from Ontario to St. Louis costs from . Prices and availability subject to change. Additional terms may apply. 

The easy way to find cheap flights to St. Louis STL from  Ontario ONT with Delta 

To find a cheap Delta flight from Ontario ONT to St. Louis STL, sort your search results by price or filter by budget. Thanks to Travelocity’s Price Match Promise, if you find a better airfare deal anywhere else within 24 hours, we’ll credit or refund the difference. 

How to find our best airfare deals on Delta flights from Ontario ONT to St. Louis STL 

If you’re looking for cheap flights, it helps to be flexible when it comes to your travel dates. You’ll usually find lower cost tickets when you travel during quieter months such as May, or if you book a flight with a stopover. 

Find nonstop flights from Ontario ONT to St. Louis STL with Delta 

If you’re keen to be on St. Louis soil fast, don’t waste time with a stopover—filter your search results to show direct Delta flights only. The journey takes around hour(s) min(s) – so you’ll be there before you know it. 

Flexible airline tickets for Delta flights from Ontario ONT to St. Louis STL 

Make sure you’re not out of pocket if plans change by choosing a flexible ticket with penalty-free amendment and cancellation options. Use our ‘no change fee’ filter to see which flights have this option.  

There are a lot of reasons to book your flights to St. Louis STL from  Ontario ONT with Delta on Travelocity 

At Travelocity our vast and up-to-the-minute inventory puts all of our best flight deals in one place. So, whether you’re traveling on business or jetting off with friends and family, you can trust Travelocity to get you there.