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Flights from Ontario to St. Louis
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Book flight tickets from Ontario to St. Louis starting at ₹ 3,718

Whether you’re going for a one-way or round-trip to St. Louis, we’ve got you covered! Check out these different flight options from Ontario below.

  • One way
  • Round-trip
      • ONT13:05
        5h 24m
        1 stop
        STL20:29
        Mon, Jan 6|Ontario - St. Louis|Frontier Airlines
        ₹ 3,718₹ 5,314
        30% OFF
        30% OFF
        ₹ 5,314₹ 3,718

        Choose Frontier Airlines flights from Ontario to St. Louis. The one-way connecting flight with Frontier Airlines departs from Ontario International Airport on Mon, Jan 6, arriving at St.Louis Lambert International Airport. One-way ticket prices start from ₹ 3,718 including taxes and charges.

      • ONT07:56
        9h 35m
        1 stop
        STL19:31
        Thu, Jan 16|Ontario - St. Louis|Frontier Airlines
        ₹ 4,266₹ 5,314
        20% OFF
        20% OFF
        ₹ 5,314₹ 4,266

        Choose Frontier Airlines flights from Ontario to St. Louis. The one-way connecting flight with Frontier Airlines departs from Ontario International Airport on Thu, Jan 16, arriving at St.Louis Lambert International Airport. One-way ticket prices start from ₹ 4,266 including taxes and charges.

      • ONT06:45
        23h 28m
        1 stop
        STL08:13
        Thu, Dec 12|Ontario - St. Louis|Frontier Airlines
        ₹ 4,301₹ 5,314
        19% OFF
        19% OFF
        ₹ 5,314₹ 4,301

        Choose Frontier Airlines flights from Ontario to St. Louis. The one-way connecting flight with Frontier Airlines departs from Ontario International Airport on Thu, Dec 12, arriving at St.Louis Lambert International Airport. One-way ticket prices start from ₹ 4,301 including taxes and charges.

      • ONT00:59
        6h 17m
        1 stop
        STL09:16
        Sat, Feb 15|Ontario - St. Louis|Frontier Airlines
        ₹ 4,569
        ₹ 4,569

        Choose Frontier Airlines flights from Ontario to St. Louis. The one-way connecting flight with Frontier Airlines departs from Ontario International Airport on Sat, Feb 15, arriving at St.Louis Lambert International Airport. One-way ticket prices start from ₹ 4,569 including taxes and charges.

      • ONT13:05
        5h 24m
        1 stop
        STL20:29
        Mon, Dec 23|Ontario - St. Louis|Frontier Airlines
        ₹ 4,593
        ₹ 4,593

        Choose Frontier Airlines flights from Ontario to St. Louis. The one-way connecting flight with Frontier Airlines departs from Ontario International Airport on Mon, Dec 23, arriving at St.Louis Lambert International Airport. One-way ticket prices start from ₹ 4,593 including taxes and charges.

      • ONT00:59
        6h 17m
        1 stop
        STL09:16
        Wed, Feb 26|Ontario - St. Louis|Frontier Airlines
        ₹ 4,651
        ₹ 4,651

        Choose Frontier Airlines flights from Ontario to St. Louis. The one-way connecting flight with Frontier Airlines departs from Ontario International Airport on Wed, Feb 26, arriving at St.Louis Lambert International Airport. One-way ticket prices start from ₹ 4,651 including taxes and charges.

      • ONT00:59
        6h 17m
        1 stop
        STL09:16
        Sat, Feb 22|Ontario - St. Louis|Frontier Airlines
        ₹ 4,686
        ₹ 4,686

        Choose Frontier Airlines flights from Ontario to St. Louis. The one-way connecting flight with Frontier Airlines departs from Ontario International Airport on Sat, Feb 22, arriving at St.Louis Lambert International Airport. One-way ticket prices start from ₹ 4,686 including taxes and charges.

      • ONT00:59
        5h 14m
        1 stop
        STL08:13
        Wed, Dec 18|Ontario - St. Louis|Frontier Airlines
        ₹ 4,779
        ₹ 4,779

        Choose Frontier Airlines flights from Ontario to St. Louis. The one-way connecting flight with Frontier Airlines departs from Ontario International Airport on Wed, Dec 18, arriving at St.Louis Lambert International Airport. One-way ticket prices start from ₹ 4,779 including taxes and charges.

      • ONT14:37
        26h 57m
        1 stop
        STL19:34
        Thu, Jan 9|Ontario - St. Louis|Frontier Airlines
        ₹ 4,861
        ₹ 4,861

        Choose Frontier Airlines flights from Ontario to St. Louis. The one-way connecting flight with Frontier Airlines departs from Ontario International Airport on Thu, Jan 9, arriving at St.Louis Lambert International Airport. One-way ticket prices start from ₹ 4,861 including taxes and charges.

      • ONT00:59
        6h 17m
        1 stop
        STL09:16
        Wed, Feb 19|Ontario - St. Louis|Frontier Airlines
        ₹ 4,884
        ₹ 4,884

        Choose Frontier Airlines flights from Ontario to St. Louis. The one-way connecting flight with Frontier Airlines departs from Ontario International Airport on Wed, Feb 19, arriving at St.Louis Lambert International Airport. One-way ticket prices start from ₹ 4,884 including taxes and charges.

      • ONT13:00
        3h 5m
        Nonstop
        STL14:00
        Wed, Dec 11|Ontario - St. Louis|Frontier Airlines
        Find More Flights
        Find More Flights

Crossed out prices are calculated based on the average price of the corresponding route on Trip.com.

Find the best time to fly from Ontario to St. Louis

Explore the best time to buy affordable tickets to St. Louis with our price trend chart, which predicts how flight prices will change in the coming weeks from previous data.

Displayed prices are calculated based on the cheapest average weekly prices of the corresponding route on Trip.com.

Airlines Flying from Ontario to St. Louis

Compare prices from various providers below to understand which option best suits your travel needs, before enjoying a comfortable journey with a trusted airline from Ontario to St. Louis.

Frontier Airlines
From ₹ 3,718
Alaska Airlines
From ₹ 10,188
Delta Air Lines
From ₹ 12,041
Southwest Airlines
From ₹ 13,556
United Airlines
From ₹ 15,060
American Airlines
From ₹ 15,794

Find more flights and airlines

Alternative Routes from Ontario to St. Louis

Searching for potential routes that might be cheaper and faster? There are a few alternative ways to get to St. Louis from Ontario which could help you save money and time.

  • Cheapest
    Frontier Airlines
    ONT
    13:05
    5h 24m
    1 transfer
    STL
    20:29
    Ontario International Airport - St.Louis Lambert International Airport
    Mon, Jan 6Frontier Airlines
    ₹ 3,718
  • Frontier Airlines
    ONT
    13:05
    5h 24m
    1 transfer
    STL
    20:29
    Ontario International Airport - St.Louis Lambert International Airport
    Mon, Jan 6Frontier Airlines
    ₹ 3,718
    Find More Flights

FAQ

  • When are flight tickets from Ontario (ONT) to St. Louis (STL) the cheapest?

    Airlines adjust prices for flights from Ontario to St. Louis based on the departure date and time of your selection. By analyzing data from all airlines, we've discovered that on Trip.com, you can find the lowest flight prices on Tuesdays, Wednesdays, and Saturdays.

  • How much do flights from Ontario (ONT) to St. Louis (STL) cost?

    According to Trip.com's data, the lowest price is around ₹ 24,513.

  • What is the transportation method from the main airport to downtown in St. Louis?

    • The distance from St.Louis Lambert International Airport to downtown is about 20 km. It takes about 40 minutes by taxi.

How to find a cheap flight from Ontario to St. Louis

Understanding the common pitfalls when booking your flight tickets can help you save massively when it comes time to fly. We’ve listed our six essential steps to keep in mind when you’re booking flight tickets to help you find the best price.
1
Book Early
Once prices are gone, they're gone. Lock in deals while you can!
2
Compare Flight Prices
Compare prices on travel agency and airline websites.
3
Look Out for Deals
Check airline and travel agency websites for latest flight deals
4
Check One-way Fares
Buying two cheap one-way flights can sometimes be a better deal than a round-trip.
5
Try Different Dates
Flying during the week, early in the morning, or late at night can help save money.
6
Use the Trip.com App
Save up to £10 per person when booking your flights on Trip.com

Flight Information from Ontario to St. Louis

Cheapest nonstop flight price₹ 3,718
Cheapest round-trip ticket price₹ 18,265
Off-season for travelJanuary
Peak season for travelDecember
Flight distance10,023.47 km
Popular airlineDelta Air Lines

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