Find cheap flights from Ontario to St. Louis starting at $41.
Book one-way or return flights from Ontario to St. Louis from as little as $41. Choose from the popular airlines below and book your flight today!
- One way
- Round-trip
- ONT00:5912h 51m1 stopSTL15:50Tue, Apr 30|Ontario - St. Louis|Frontier Airlines$41$6941% OFF41% OFF$69$41
- ONT00:596h 48m1 stopSTL09:47Wed, May 1|Ontario - St. Louis|Frontier Airlines$41$6941% OFF41% OFF$69$41
- ONT12:397h 20m1 stopSTL21:59Tue, May 14|Ontario - St. Louis|Frontier Airlines$42$6938% OFF38% OFF$69$42
- ONT12:397h 20m1 stopSTL21:59Tue, May 7|Ontario - St. Louis|Frontier Airlines$45$45
- ONT00:596h 48m1 stopSTL09:47Wed, May 8|Ontario - St. Louis|Frontier Airlines$47$47
- ONT00:596h 48m1 stopSTL09:47Mon, May 13|Ontario - St. Louis|Frontier Airlines$47$47
- ONT00:596h 37m1 stopSTL09:36Wed, May 22|Ontario - St. Louis|Frontier Airlines$47$47
- ONT12:347h 35m1 stopSTL22:09Thu, May 2|Ontario - St. Louis|Frontier Airlines$48$48
- ONT00:556h 52m1 stopSTL09:47Sat, May 4|Ontario - St. Louis|Frontier Airlines$48$48
- ONT00:596h 26m1 stopSTL09:25Sat, May 18|Ontario - St. Louis|Frontier Airlines$48$48
- ONT13:003h 5mDirectSTL14:00Sun, May 5|Ontario - St. Louis|Frontier AirlinesFind More FlightsFind More Flights
Crossed out prices are calculated based on the average price of the corresponding route on Trip.com.
Searching for the best last minute flight from Ontario to St. Louis? Find one-way or return flights that are affordable and fit your itinerary.
Trip.com monitors the ticket fares of flights from Ontario to St. Louis. Stay updated on price trends and snag the best deals for your upcoming trip.
View airlines operating flights from Ontario to St. Louis. Compare prices, find the option that best suits your travel needs, and enjoy a comfortable journey with a trusted airline.
Find more flights and airlines
Discover different routes, airlines, and transfers and find the best alternative flights for your journey from Ontario to St. Louis.
- CheapestONT00:596h 48m1 transferSTL09:47Ontario International Airport - St. Louis Lambert International AirportWed, May 1Frontier Airlines$41
- ONT00:596h 48m1 transferSTL09:47Ontario International Airport - St. Louis Lambert International AirportWed, May 1Frontier Airlines$41Find More Flights
Frequently Asked Questions
How to find a cheap flight from Ontario to St. Louis
Cheapest nonstop flight price | $40 |
---|---|
Cheapest round-trip ticket price | $75 |
Off-season for travel | January |
Peak season for travel | December |
Flight distance | 10,023.47km |
Popular airline | Frontier Airlines |
Plan Your Trip Around St. Louis
Popular Flights
Popular Flights from Ontario
Popular Flights to St. Louis
- Accra to St. Louis Flights
- Bar Harbor to St. Louis Flights
- Istanbul to St. Louis Flights
- Barcelona to St. Louis Flights
- Islamabad to St. Louis Flights
- Aberdeen to St. Louis Flights
- Los Angeles to St. Louis Flights
- Louisville to St. Louis Flights
- Fuerteventura to St. Louis Flights
- Monrovia to St. Louis Flights
Popular Hotels
- Tesla Wellness Hotel and MedBed Center
- Freedom Acres Lifestyle (Swinger) Resorts - Adults Only
- The Spalding Inn
- The Hotel Conneaut
- Yalong Bay Earthly Paradise Birds Nest Resort
- Villent Kujukuri Ocean 2
- Fugui Hostel
- Bungalow Californie
- Garden City - Apartment (Ocean Views)
- Filters Cottage
- Jinjiang Star Pinshang Hotel Reviews
- Yeste International (Guiyang Zhonghua North Road) Reviews
- Fuji International Hotel Reviews
- Hotelpark Stadtbrauerei Arnstadt Reviews
- Express Inci Airport Hotel Reviews
- Hotel Port-Royal Reviews
- Sea View Hotel Reviews
- Lake Tekapo Village Motel Reviews
- Faros Hotel Old City - Special Category Reviews
- Dasheng Holiday Hotel Reviews
Recommended for you
- Ahmedabad to Dubai Flight Time
- Windsor to Vancouver Flight Time
- Chicago to Wilkes Barre Flight Time
- Liverpool to Sofia Flight Time
- Dubai to Mumbai Flight Time
- Baghdad to Portland Flights
- Flights to Baku
- Atlanta to Idaho Falls Flights
- Dallas to Miami Flights
- Fort Lauderdale to Boston Flights
- Flights from Tijuana
- Allegiant Air to Santa Ana
- Casablanca to Los Angeles Flights
- Los Angeles to Tehran Flights
- Chicago to Dallas Flights
- Flights From This City to This Airport
- Philippine Airlines to Perth
- Batik Air Malaysia to Sydney
- San Diego to Bristol Flights
- Manchester to Cairns Flights
Necessary Travel Information
- Lady Day at the Emerson Bar & Grill Dinner Theatre Production
- Bachtoberfest 2023!
- Master Class with Suki Schorer
- David Nihill: Shelf Help Tour 2024 (Boston)
- Amelia Umuhire: African Film Institute Film Series
- AMPSURF Surf On Saturday/VetSurf (Pismo Beach)
- Chicago Hounds at New England Free Jacks
- Steel Panther: On The Prowl Winter Holidaze Tour 2023 (Charles Town)
- Ashley McBryde: The Devil I Know Tour (Minneapolis)
- French it up comedy club (Stand up Show openmic in French)
About
Site Operator: Trip.com Travel Singapore Pte. Ltd.