Cheap Flights from Ontario International Airport to St. Louis (STL) Find and Compare the Best Airline Deals | Skyticket

Departure Date

2025/4
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2025/4
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Total Fares（Round-Trip/Economy）: USD /Per Person

* Displayed fare(s) may differ from the actual search result

Ontario－St. Louis Lambert Airport
April Lowest Airfares
USD456

The airfare displayed above is for United Airlines

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Ontario－St. Louis Lambert Airport
May Lowest Airfares
USD326

The airfare displayed above is for Delta Air Lines

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Ontario－St. Louis Lambert Airport
June Lowest Airfares
USD594

The airfare displayed above is for Delta Air Lines

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Ontario－St. Louis Lambert Airport
July Lowest Airfares
USD368

The airfare displayed above is for Delta Air Lines

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Ontario－St. Louis Lambert Airport
August Lowest Airfares
USD391

The airfare displayed above is for Delta Air Lines

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Ontario－St. Louis
Estimated Flight Time
4 Hours 25 Minutes
Ontario－St. Louis
Number of Operating Airlines
4

Operating Airlines for Ontario－St. Louis Lambert Airport Route
American Airlines

Alaska Airlines

Delta Air Lines

United Airlines

Other Destinations from:Ontario

Ontario－Syracuse(Hancock)
USD781〜
Ontario－Tampa(TPA)
USD278〜
Ontario－Tucson(TUS)
USD230〜
* Fares vary in accordance to seat availability
Other Departures to: St. Louis

Philadelphia Airport－St. Louis(Lambert)
USD353〜
* Fares vary in accordance to seat availability