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St. Louis Lambert International Airport to Ontario International Airport flight
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Cheap Flights from St. Louis Lambert International Airport to Ontario International Airport

Search for flights from St. Louis to Los Angeles and check out affordable one-way and round-trip options.

  • One way
  • Round-trip
sortSort by: Lowest Price
  • Sort by: Lowest Price
  • Sort by: Earliest Flight
      • STL20:04
        5h 55m
        Direct
        ONT23:59
        St. Louis - Ontario|Sat, May 18|Frontier Airlines
        $28$70
        61% OFF
        61% OFF
        $70$28
      • STL20:04
        5h 55m
        Direct
        ONT23:59
        St. Louis - Ontario|Wed, May 15|Frontier Airlines
        $33$70
        54% OFF
        54% OFF
        $70$33
      • STL22:59
        25h 10m
        1 stop
        ONT22:09
        St. Louis - Ontario|Tue, May 14|Frontier Airlines
        $48$70
        32% OFF
        32% OFF
        $70$48
      • STL23:06
        26h 53m
        1 stop
        ONT23:59
        St. Louis - Ontario|Thu, May 16|Frontier Airlines
        $48
        $48
      • STL20:04
        5h 55m
        Direct
        ONT23:59
        St. Louis - Ontario|Mon, May 20|Frontier Airlines
        $50
        $50
      • STL19:23
        15h 41m
        1 stop
        ONT09:04
        St. Louis - Ontario|Tue, May 28|Frontier Airlines
        $50
        $50
      • STL19:23
        15h 41m
        1 stop
        ONT09:04
        St. Louis - Ontario|Tue, May 21|Frontier Airlines
        $52
        $52
      • STL19:23
        25h
        1 stop
        ONT18:23
        St. Louis - Ontario|Thu, May 23|Frontier Airlines
        $52
        $52
      • STL19:23
        16h 11m
        1 stop
        ONT09:34
        St. Louis - Ontario|Sun, Jun 2|Frontier Airlines
        $52
        $52
      • STL22:59
        10h 9m
        1 stop
        ONT07:08
        St. Louis - Ontario|Thu, May 9|Frontier Airlines
        $53
        $53
      • STL13:00
        3h 5m
        Direct
        ONT14:00
        St. Louis - Los Angeles|Thu, May 16|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.

Selected Airlines from St. Louis Lambert International Airport to Ontario International Airport

See which airlines fly from St. Louis to Los Angeles. Find the airline that best meets your travel needs by comparing prices and treat yourself to an enjoyable journey.

Frontier Airlines
From $28
Spirit Airlines
From $63
American Airlines
From $99
Delta Air Lines
From $127
United Airlines
From $147
Alaska Airlines
From $191
Southwest Airlines
From $199
Sun Country Airlines
From $218
ANA airlines
Find more flights and airlines

Find Cheaper Flights from St. Louis to Los Angeles

Explore other flights from St. Louis to Los Angeles to find the best alternative options.

  • Cheapest
    Spirit Airlines
    STL
    11:36
    12h 16m
    1 transfer
    LAX
    21:52
    St. Louis Lambert International Airport - Los Angeles International Airport
    Wed, May 15Spirit Airlines
    $79
  • Spirit Airlines
    STL
    11:36
    12h 16m
    1 transfer
    LAX
    21:52
    St. Louis Lambert International Airport - Los Angeles International Airport
    Wed, May 15Spirit Airlines
    $79
    Find More Flights

St. Louis Lambert International Airport to Ontario International Airport Flights Info

Flight distance2,485.2km
Cheapest one-way ticket price$27
Cheapest return ticket price$87

FAQs for St. Louis Lambert International Airport to Ontario International Airport Flights

  • How long is a flight from St. Louis Lambert International Airport to Ontario International Airport?

    It takes around 5 hours 51 minutes to fly from St. Louis Lambert International Airport (STL) to Ontario International Airport (ONT).

  • How many daily flights are there from St. Louis Lambert International Airport (STL) to Ontario International Airport (ONT)?

    There are around 1 daily flights from St. Louis Lambert International Airport (STL) to Ontario International Airport (ONT).

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

    Tickets cost around $346 in May, making it the cheapest month to book. St. Louis Lambert International Airport (STL) to Ontario International Airport (ONT) is a popular route, so don't forget to book your tickets in advance.

  • When are flight tickets from St. Louis Lambert International Airport (STL) to Ontario International Airport (ONT) most expensive?

    The route from St. Louis Lambert International Airport (STL) to Ontario International Airport (ONT) is quite popular. Without considering departure times or holidays, tickets cost around $346 in May, the most expensive month to book this route.

  • What time does the earliest flight from St. Louis Lambert International Airport to Ontario International Airport depart?

    The earliest flight departs from St. Louis Lambert International Airport (STL) at 05:25 and arrives in Ontario International Airport (ONT) at 08:30.

  • What time does the latest flight from St. Louis Lambert International Airport to Ontario International Airport depart?

    The latest flight departs from St. Louis Lambert International Airport (STL) at 20:04 and arrives in Ontario International Airport (ONT) at 23:59.

  • What is the transportation method from the main airport to downtown in Los Angeles?

    • The distance from Los Angeles International Airport to downtown is about 19km. It takes about 30 minutes by taxi.
    • The distance from Ontario International Airport to downtown is about 59km. It takes about 1 hour 10 minutes by taxi.

  • What's the closest airport to Ontario International Airport (ONT)?

    The closest airport to Ontario International Airport (ONT) is Chino Airport. The distance is around 9km.

  • Which airline operates the most direct flights from St. Louis Lambert International Airport (STL) to Ontario International Airport (ONT)?

    Southwest Airlines is a very popular airline operating an average of 116 flights per month.

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