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Flights from St. Louis to Ontario
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Flights from St. Louis to Ontario Starting at NZD 48

We've found these cheap flights for you. You can book one-way or return flight tickets.

  • One way
  • Round-trip
      • STL22:32
        27h 7m
        1 stop
        ONT23:39
        Tue, Oct 29|St. Louis - Ontario|Frontier Airlines
        NZD 48NZD 119
        60% OFF
        60% OFF
        NZD 119NZD 48
      • STL18:46
        6h 58m
        1 stop
        ONT23:44
        Sat, Dec 7|St. Louis - Ontario|Frontier Airlines
        NZD 90NZD 119
        24% OFF
        24% OFF
        NZD 119NZD 90
      • STL17:27
        8h 37m
        1 stop
        ONT00:04
        Wed, Nov 13|St. Louis - Ontario|Frontier Airlines
        NZD 91NZD 119
        23% OFF
        23% OFF
        NZD 119NZD 91
      • STL17:27
        8h 37m
        1 stop
        ONT00:04
        Wed, Nov 20|St. Louis - Ontario|Frontier Airlines
        NZD 91
        NZD 91
      • STL17:27
        8h 37m
        1 stop
        ONT00:04
        Wed, Nov 6|St. Louis - Ontario|Frontier Airlines
        NZD 92
        NZD 92
      • STL17:25
        8h 39m
        1 stop
        ONT00:04
        Sat, Nov 9|St. Louis - Ontario|Frontier Airlines
        NZD 92
        NZD 92
      • STL17:37
        8h 27m
        1 stop
        ONT00:04
        Tue, Nov 19|St. Louis - Ontario|Frontier Airlines
        NZD 92
        NZD 92
      • STL17:37
        8h 27m
        1 stop
        ONT00:04
        Tue, Nov 5|St. Louis - Ontario|Frontier Airlines
        NZD 93
        NZD 93
      • STL17:20
        8h 38m
        1 stop
        ONT23:58
        Sat, Nov 2|St. Louis - Ontario|Frontier Airlines
        NZD 95
        NZD 95
      • STL15:49
        17h 36m
        1 stop
        ONT07:25
        Fri, Nov 1|St. Louis - Ontario|Frontier Airlines
        NZD 96
        NZD 96
      • STL13:00
        3h 5m
        Direct
        ONT14:00
        Mon, Nov 4|St. Louis - Ontario|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 St. Louis to Ontario

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Displayed prices are calculated based on the cheapest average weekly prices of the corresponding route on Trip.com.
Airlines Flying from St. Louis to Ontario

Compare prices, find the option that best suits your travel needs, and enjoy a comfortable journey with a trusted airline.

Frontier Airlines
From NZD 48
Delta Air Lines
From NZD 205
Alaska Airlines
From NZD 211
United Airlines
From NZD 224
American Airlines
From NZD 246
Southwest Airlines
From NZD 257
ANA airlines

Find more flights and airlines

Alternative Routes from St. Louis to Ontario

Searching for potential routes that might be cheaper and faster? Check out these alternative flights from St. Louis to Ontario.

  • Cheapest
    Frontier Airlines
    STL
    22:32
    27h 7m
    1 transfer
    ONT
    23:39
    St. Louis Lambert International Airport - Ontario International Airport
    Tue, Oct 29Frontier Airlines
    NZD 48
  • Frontier Airlines
    STL
    22:32
    27h 7m
    1 transfer
    ONT
    23:39
    St. Louis Lambert International Airport - Ontario International Airport
    Tue, Oct 29Frontier Airlines
    NZD 48
    Find More Flights

FAQ

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

    Airlines adjust prices for flights from St. Louis to Ontario 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 St. Louis (STL) to Ontario (ONT) cost?

    According to Trip.com's data, the lowest price is around NZD 526.

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

Wait until the last minute and flight costs are often sky-high. Plan ahead, book the right way, and your savings can soar. We have loads of saving tips to help you find a cheap flight from St. Louis to Ontario. Book your flights at the right time and save more.
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 St. Louis to Ontario

Cheapest nonstop flight price

NZD 47

Cheapest round-trip ticket price

NZD 368

Off-season for travel

October

Peak season for travel

November

Flight distance

10,023.47 km

Popular airline

Frontier Airlines

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