
$154 Cheap American Airlines flights from Ontario to St. Louis (ONT to STL)
Find The Best Day To Fly from Ontario to St. Louis
Amazing American Airlines ONT to STL Flight Deals
The cheapest flights to Lambert-St. Louis Intl. found within the past 7 days were $309 round trip and $154 one way. Prices and availability subject to change. Additional terms may apply.
STL From ONT Economy Coach Packages on Similar Airlines



Frequently asked questions
Discover our best American Airlines flight from Ontario ONT to St. Louis STL
To find the best deals on flights to Ontario from St. Louis with American Airlines, just enter your travel dates, filter by American Airlines, 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 American Airlines
If you’re planning a round trip, booking return flights with American Airlines is usually the most cost-effective option. With airfares ranging from $309 to $309, it’s easy to find a flight that suits your budget. Prices and availability subject to change. Additional terms may apply.
Book one-way American Airlines 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 American Airlines flight from Ontario to St. Louis costs from $154. 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 American Airlines
To find a cheap American Airlines 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 American Airlines 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 American Airlines
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 American Airlines flights only. The journey takes around hour(s) min(s) – so you’ll be there before you know it.
Flexible airline tickets for American Airlines 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 American Airlines 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.
Airport code | Country | Airport name | Number of flights |
---|---|---|---|
DFW | USA | Dallas-Fort Worth Intl. | 599 |
CLT | USA | Charlotte-Douglas Intl. | 536 |
ORD | USA | O'Hare Intl. | 317 |
PHL | USA | Philadelphia Intl. | 247 |
MIA | USA | Miami Intl. | 193 |
DCA | USA | Ronald Reagan Washington National | 152 |
PHX | USA | Sky Harbor Intl. | 141 |
LAX | USA | Los Angeles Intl. | 81 |
LGA | USA | LaGuardia | 72 |
BOS | USA | Logan Intl. | 57 |
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Popular American Airlines Flight Routes from ONT
Top American Airlines Flight Routes from STL
Top Flights for American Airlines originating from ONT
Domestic
- Philadelphia to Orlando (PHL - MCO)
- Newark Liberty Intl. Airport to Tampa (EWR - TPA)
- New York to San Juan (LGA - SJU)
- Newark Liberty Intl. Airport to Santiago (EWR - STI)
- Newark Liberty Intl. Airport to Las Vegas (EWR - LAS)
- New York to Orlando (JFK - MCO)
- Philadelphia to Orlando (PHL - MCO)
- New York to Orlando (LGA - MCO)
- New York to Montego Bay (JFK - MBJ)
- New York to Santiago (JFK - STI)
International
- Newark Liberty Intl. Airport to Santiago (EWR - STI)
- Los Angeles to Honolulu (LAX - HNL)
- New York to Orlando (JFK - MCO)
- New York to San Juan (LGA - SJU)
- New York to Orlando (LGA - MCO)
- New York to Santo Domingo (JFK - SDQ)
- New York to Santiago (JFK - STI)
- New York to Montego Bay (JFK - MBJ)
- Newark Liberty Intl. Airport to Miami (EWR - MIA)
- New York to Montego Bay (JFK - MBJ)