Title: Cheap Flights from St. Louis (STL) to Ontario (ONT) - Expedia.ca ![Ontario showing night scenes and street scenes](https://images.trvl-media.com/place/2680/6f6cbfd1-6188-4a75-9ba7-05d8edf0fb1d.jpg?impolicy=fcrop&w=1200&h=500&q=medium) Photo by Ontario Convention & Visitors Bureau / Jon Edwards. ![](https://images.trvl-media.com/place/2680/6f6cbfd1-6188-4a75-9ba7-05d8edf0fb1d.jpg?impolicy=fcrop&w=1200&h=500&q=medium) # Cheap Flights from St. Louis (STL) to Ontario (ONT) - [Roundtrip](?flightType=roundtrip) - [One-way](?flightType=oneway) - [Multi-city](?flightType=multicity) ### Travellers Adults ChildrenAges 2 to 17 InfantsYounger than 2 EconomyPremium economyBusiness classFirst class Leaving from Going to Departing Add a place to stay Direct flights only ## Popular airlines from Lambert-St. Louis International Airport (STL) to Los Angeles - Ontario Intl. Airport (ONT) - ![American Airlines](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_AA.svg) American Airlines [](https://www.expedia.ca/Flights-Search?leg1=from:STL,to:ONT,departure:30/12/2025TANYT&leg2=from:ONT,to:STL,departure:06/01/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"AA"}}]) - ![Southwest Airlines](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_WN.svg) Southwest Airlines [](https://www.expedia.ca/Flights-Search?leg1=from:STL,to:ONT,departure:30/12/2025TANYT&leg2=from:ONT,to:STL,departure:06/01/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"WN"}}]) - ![Delta](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_DL.svg) Delta [](https://www.expedia.ca/Flights-Search?leg1=from:STL,to:ONT,departure:30/12/2025TANYT&leg2=from:ONT,to:STL,departure:06/01/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"DL"}}]) - ![Frontier Airlines](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_F9.svg) Frontier Airlines [](https://www.expedia.ca/Flights-Search?leg1=from:STL,to:ONT,departure:30/12/2025TANYT&leg2=from:ONT,to:STL,departure:06/01/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"F9"}}]) - ![United](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_UA.svg) United [](https://www.expedia.ca/Flights-Search?leg1=from:STL,to:ONT,departure:30/12/2025TANYT&leg2=from:ONT,to:STL,departure:06/01/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"UA"}}]) - ![Alaska Airlines](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_AS.svg) Alaska Airlines [](https://www.expedia.ca/Flights-Search?leg1=from:STL,to:ONT,departure:30/12/2025TANYT&leg2=from:ONT,to:STL,departure:06/01/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"AS"}}]) - ![Hawaiian Airlines](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_HA.svg) Hawaiian Airlines [](https://www.expedia.ca/Flights-Search?leg1=from:STL,to:ONT,departure:30/12/2025TANYT&leg2=from:ONT,to:STL,departure:06/01/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"HA"}}]) - ![notification illustration](https://a.travel-assets.com/travel-assets-manager/pictogram-bex/light__notification.svg) ### Be in the know Get alerts if flight prices drop or rise\* - ![deals illustration](https://a.travel-assets.com/travel-assets-manager/pictogram-bex/light__deals.svg) ### Book smarter Save up to 30% on select hotels after you book a flight\* - ![trophy illustration](https://a.travel-assets.com/travel-assets-manager/pictogram-bex/light__trophy.svg) ### Earn twice Earn your airline miles on top of our rewards [Sign in](https://www.expedia.ca/login) ## Cheap flights from St. Louis (STL) to Ontario (ONT) Prices were available within the past 7 days and start at for one-way flights and CA $455 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply. All deals One way Roundtrip ![Delta](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/DL.gif) Sun, Jan 18 - Wed, Jan 21 STL St. Louis ONT Ontario CA $455 Roundtrip found 5 days ago [](https://expedia.ca/Flights-Search?trip=roundtrip&leg1=from:STL,to:ONT,departure:18/01/2026TANYT&leg2=from:ONT,to:STL,departure:21/01/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:454.90&airProductToken=AQpFCiAIxJgBEgQxNDkyGPJcIPISKOTmggMwrOiCAzhFQABYAQohCMSYARIEMTYxNBjyEiCumwEoi-mCAzD86YIDOEVAAVgBCkUKIQjEmAESBDI3MDgYrpsBIPISKKiEgwMwmYWDAzhFQABYAQogCMSYARIEMjQyMRjyEiDyXCjUhYMDMISHgwM4RUABWAESCggBEAEYASoCREwYASIECAEQASgEMAE) ![Delta](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/DL.gif) Sun, Jan 18 - Fri, Jan 23 STL St. Louis ONT Ontario CA $472 Roundtrip found 5 days ago [](https://expedia.ca/Flights-Search?trip=roundtrip&leg1=from:STL,to:ONT,departure:18/01/2026TANYT&leg2=from:ONT,to:STL,departure:23/01/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:471.10&airProductToken=AQpFCiAIxJgBEgQxNDkyGPJcIPISKOTmggMwrOiCAzhFQABYAQohCMSYARIEMTYxNBjyEiCumwEoi-mCAzD86YIDOEVAAVgBCkQKIAjEmAESAzQ3NRiumwEg8hIolp6DAzCDn4MDOEVAAFgBCiAIxJgBEgQyNjY2GPISIPJcKPKfgwMwmqGDAzhFQAFYARIKCAEQARgBKgJETBgBIgQIARABKAQwAQ) ![Delta](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/DL.gif) Sun, Jan 18 - Thu, Jan 22 STL St. Louis ONT Ontario CA $474 Roundtrip found 5 days ago [](https://expedia.ca/Flights-Search?trip=roundtrip&leg1=from:STL,to:ONT,departure:18/01/2026TANYT&leg2=from:ONT,to:STL,departure:22/01/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:473.20&airProductToken=AQpFCiAIxJgBEgQxNDkyGPJcIPISKOTmggMwrOiCAzhFQABYAQohCMSYARIEMTYxNBjyEiCumwEoi-mCAzD86YIDOEVAAVgBCkUKIQjEmAESBDI3MDgYrpsBIPISKMiPgwMwuZCDAzhFQABYAQogCMSYARIEMjQyMRjyEiDyXCj0kIMDMKSSgwM4RUABWAESCggBEAEYASoCREwYASIECAEQASgEMAE) ![Delta](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/DL.gif) Sun, Jan 25 - Tue, Jan 27 STL St. Louis ONT Ontario CA $511 Roundtrip found 5 days ago [](https://expedia.ca/Flights-Search?trip=roundtrip&leg1=from:STL,to:ONT,departure:25/01/2026TANYT&leg2=from:ONT,to:STL,departure:27/01/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:510.80&airProductToken=AQpECiAIxJgBEgQxNTI0GPJcIOBcKLCwgwMwmbGDAzhFQABYAQogCMSYARIDNjY1GOBcIK6bASjRsYMDMPOzgwM4RUABWAEKRQohCMSYARIEMjcwOBiumwEg8hIo6MeDAzDZyIMDOEVAAFgBCiAIxJgBEgQyNDIxGPISIPJcKJTJgwMwxMqDAzhFQAFYARIKCAEQARgBKgJETBgBIgQIARABKAQwAQ) ![Delta](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/DL.gif) Mon, Jan 19 - Wed, Jan 21 STL St. Louis ONT Ontario CA $513 Roundtrip found 5 days ago [](https://expedia.ca/Flights-Search?trip=roundtrip&leg1=from:STL,to:ONT,departure:19/01/2026TANYT&leg2=from:ONT,to:STL,departure:21/01/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:513.00&airProductToken=AQpDCh8IxJgBEgM1NDMY8lwg4FwoufGCAzCd8oIDOEVAAFgBCiAIxJgBEgM3NzkY4FwgrpsBKNLyggMw8fSCAzhFQAFYAQpFCiEIxJgBEgQyNzA4GK6bASDyEiiohIMDMJmFgwM4RUAAWAEKIAjEmAESBDI0MjEY8hIg8lwo1IWDAzCEh4MDOEVAAVgBEgoIARABGAEqAkRMGAEiBAgBEAEoBDAB) ![Delta](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/DL.gif) Sun, Jan 25 - Mon, Jan 26 STL St. Louis ONT Ontario CA $526 Roundtrip found 5 days ago [](https://expedia.ca/Flights-Search?trip=roundtrip&leg1=from:STL,to:ONT,departure:25/01/2026TANYT&leg2=from:ONT,to:STL,departure:26/01/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:525.90&airProductToken=AQpECiAIxJgBEgQxNTI0GPJcIOBcKLCwgwMwmbGDAzhFQABYAQogCMSYARIDNjY1GOBcIK6bASjRsYMDMPOzgwM4RUABWAEKRAogCMSYARIDNDc1GK6bASDyEij2v4MDMOPAgwM4RUAAWAEKIAjEmAESBDI2NjYY8hIg8lwo0sGDAzD6woMDOEVAAVgBEgoIARABGAEqAkRMGAEiBAgBEAEoBDAB) ![Delta](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/DL.gif) Mon, Jan 19 - Fri, Jan 23 STL St. Louis ONT Ontario CA $530 Roundtrip found 5 days ago [](https://expedia.ca/Flights-Search?trip=roundtrip&leg1=from:STL,to:ONT,departure:19/01/2026TANYT&leg2=from:ONT,to:STL,departure:23/01/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:529.10&airProductToken=AQpDCh8IxJgBEgM1NDMY8lwg4FwoufGCAzCd8oIDOEVAAFgBCiAIxJgBEgM3NzkY4FwgrpsBKNLyggMw8fSCAzhFQAFYAQpECiAIxJgBEgM0NzUYrpsBIPISKJaegwMwg5-DAzhFQABYAQogCMSYARIEMjY2NhjyEiDyXCjyn4MDMJqhgwM4RUABWAESCggBEAEYASoCREwYASIECAEQASgEMAE) ![Delta](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/DL.gif) Mon, Jan 19 - Thu, Jan 22 STL St. Louis ONT Ontario CA $532 Roundtrip found 5 days ago [](https://expedia.ca/Flights-Search?trip=roundtrip&leg1=from:STL,to:ONT,departure:19/01/2026TANYT&leg2=from:ONT,to:STL,departure:22/01/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:531.30&airProductToken=AQpDCh8IxJgBEgM1NDMY8lwg4FwoufGCAzCd8oIDOEVAAFgBCiAIxJgBEgM3NzkY4FwgrpsBKNLyggMw8fSCAzhFQAFYAQpFCiEIxJgBEgQyNzA4GK6bASDyEijIj4MDMLmQgwM4RUAAWAEKIAjEmAESBDI0MjEY8hIg8lwo9JCDAzCkkoMDOEVAAVgBEgoIARABGAEqAkRMGAEiBAgBEAEoBDAB) ## Find the cheapest month to fly from St. Louis (STL) to Ontario (ONT) ### February is typically the cheapest month to fly From CA $166 - CA $630 per traveller. __Flight from St. Louis to Ontario (STL - ONT) route information__ | Origin airport | Lambert-St. Louis Intl. | | ------------------- | --------------------------- | | Destination airport | Los Angeles - Ontario Intl. | | Roundtrip price | CA $455 | | Distance | 2467 km | ## St. Louis to Los Angeles Flights **The easy way to book your flights from St. Louis to Ontario** With Expedia, it’s simple to find and book flights to Ontario from St. Louis whether you’re traveling for business or pleasure. Enter your travel dates, hit search, and choose your flight from 8 airlines that cover this route. There are nonstop flights to Los Angeles - Ontario Intl., too. Choose your preferred carrier and cabin class with the advanced search tool and select your ideal departure time. Then, if you want, you can see just nonstop or refundable flights. And if you’re traveling last minute, just enter the date to check out flights from St. Louis to Ontario today, tomorrow, or this week. **Save dollars with cheap flights from Lambert-St. Louis Intl., STL to Los Angeles - Ontario Intl., ONT** Sort your search results by price to find great deals on your flight from St. Louis to Ontario—you get all your cheapest options first. Grab yourself a bargain now—the lowest price on flights to Ontario from St. Louis currently is just CA $455 rising to CA $532\. Here are more money-saving tips: - Fly in January when flight prices are normally at their lowest - Book about a month to 6 weeks before you travel for the best prices to Ontario - Avoid peak season and weekends when flights can cost more - Early morning and late-night flights are sometimes cheaper, so try varying your travel times - One surefire way to save money on your flight is to book your flight and hotel together with Expedia. Sometimes, the savings are so large that the flight is basically free! **Reasons to choose Expedia for your flight to Ontario from St. Louis** Whatever your destination, budget, or reason to travel, in just one quick search, you can choose from loads of flights, airlines, and cabin classes. The filters make it quick and easy to find your ideal flights, and if you choose one of the flexible options, you won’t be charged to change your flight. So book your flight to Ontario with Expedia today. ## Frequently asked questions ### How much is a flight from Lambert-St. Louis Intl. Airport (STL) to ONT? ### Do I need to pay a cancellation fee if I cancel my flight from Lambert-St. Louis Intl. Airport (STL) to Los Angeles - Ontario Intl. Airport (ONT)? ### How do I find cheap flights from Lambert Field to Ontario Airport that have flexible change policies? ### How many hours is the flight from Lambert-St. Louis Intl. Airport (STL) to Ontario Airport? ### How far is the flight from STL to Ontario Airport? ### Which airlines fly direct from Lambert-St. Louis Intl. Airport (STL) to ONT? ### Are Lambert-St. Louis Intl. Airport (STL) to ONT flight tickets cheaper when they're purchased at the last minute? ## Explore a world of travel with Expedia - Flights - [Flights from Bamfield to Ontario ](https://www.expedia.ca/lp/flights/10552/2680/bamfield-to-ontario) - [Flights from Revelstoke to Ontario ](https://www.expedia.ca/lp/flights/10607/2680/revelstoke-to-ontario) - [Flights from Dutch Harbor to Ontario ](https://www.expedia.ca/lp/flights/1075/2680/dutch-harbor-to-ontario) - [Flights from Devils Lake to Ontario ](https://www.expedia.ca/lp/flights/1076/2680/devils-lake-to-ontario) - [Flights from Heraklion to Ontario ](https://www.expedia.ca/lp/flights/1444/2680/heraklion-to-ontario) - [Flights from Harbin to Ontario ](https://www.expedia.ca/lp/flights/1510/2680/harbin-to-ontario) - [Flights from Jamestown to Ontario ](https://www.expedia.ca/lp/flights/1709/2680/jamestown-to-ontario) - [Flights from Anchorage to Ontario ](https://www.expedia.ca/lp/flights/178230/2680/anchorage-to-ontario) - [Flights from Athens to Ontario ](https://www.expedia.ca/lp/flights/178231/2680/athens-to-ontario) - 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[Flights from Dexter to Ontario ](https://www.expedia.ca/lp/flights/3000448346/2680/dexter-to-ontario) - [Flights from Singapore to Ontario ](https://www.expedia.ca/lp/flights/3168/2680/singapore-to-ontario) - [Flights from Menongue to Ontario ](https://www.expedia.ca/lp/flights/3252/2680/menongue-to-ontario) - [Flights from Amman to Ontario ](https://www.expedia.ca/lp/flights/375/2680/amman-to-ontario) - [Flights from Wroclaw to Ontario ](https://www.expedia.ca/lp/flights/3820/2680/wroclaw-to-ontario) - [Flights from West Yellowstone to Ontario ](https://www.expedia.ca/lp/flights/3846/2680/west-yellowstone-to-ontario) - [Flights from Dauphin to Ontario ](https://www.expedia.ca/lp/flights/3923/2680/dauphin-to-ontario) - [Flights from Kelowna to Ontario ](https://www.expedia.ca/lp/flights/3997/2680/kelowna-to-ontario) - [Flights from Powell River to Ontario ](https://www.expedia.ca/lp/flights/4040/2680/powell-river-to-ontario) - [Flights from Deer Lake to Ontario ](https://www.expedia.ca/lp/flights/4107/2680/deer-lake-to-ontario) - [Flights from Medicine Hat to Ontario ](https://www.expedia.ca/lp/flights/4118/2680/medicine-hat-to-ontario) - [Flights from Manzanillo to Ontario ](https://www.expedia.ca/lp/flights/4182/2680/manzanillo-to-ontario) - [Flights from Newman to Ontario ](https://www.expedia.ca/lp/flights/4185/2680/newman-to-ontario) - [Flights from Aurillac to Ontario ](https://www.expedia.ca/lp/flights/459/2680/aurillac-to-ontario) - [Flights from Forest Hill to Ontario ](https://www.expedia.ca/lp/flights/553248634374477394/2680/forest-hill-to-ontario) - [Flights from Fort St. John to Ontario ](https://www.expedia.ca/lp/flights/57378/2680/fort-st-john-to-ontario) - [Flights from Myrtle Beach to Ontario ](https://www.expedia.ca/lp/flights/601685/2680/myrtle-beach-to-ontario) - [Flights from Oakland to Ontario ](https://www.expedia.ca/lp/flights/601762/2680/oakland-to-ontario) - [Flights from Krabi to Ontario ](https://www.expedia.ca/lp/flights/602231/2680/krabi-to-ontario) - [Flights from Worcester to Ontario ](https://www.expedia.ca/lp/flights/6023336/2680/worcester-to-ontario) - 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