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

  • One way
  • Round-trip
sortSort by: Lowest Price
  • Sort by: Lowest Price
  • Sort by: Earliest Flight
      • ONT00:59
        12h 51m
        1 stop
        STL15:50
        Ontario - St. Louis|Tue, Apr 30|Frontier Airlines
        US$41US$57
        28% OFF
        28% OFF
        US$57US$41
      • ONT00:59
        6h 48m
        1 stop
        STL09:47
        Ontario - St. Louis|Wed, May 1|Frontier Airlines
        US$41US$57
        28% OFF
        28% OFF
        US$57US$41
      • ONT12:39
        7h 20m
        1 stop
        STL21:59
        Ontario - St. Louis|Tue, May 14|Frontier Airlines
        US$42US$57
        25% OFF
        25% OFF
        US$57US$42
      • ONT12:39
        7h 20m
        1 stop
        STL21:59
        Ontario - St. Louis|Tue, May 7|Frontier Airlines
        US$45
        US$45
      • ONT00:59
        6h 48m
        1 stop
        STL09:47
        Ontario - St. Louis|Wed, May 8|Frontier Airlines
        US$46
        US$46
      • ONT00:59
        6h 48m
        1 stop
        STL09:47
        Ontario - St. Louis|Mon, May 13|Frontier Airlines
        US$47
        US$47
      • ONT12:34
        7h 35m
        1 stop
        STL22:09
        Ontario - St. Louis|Thu, May 2|Frontier Airlines
        US$48
        US$48
      • ONT00:55
        6h 52m
        1 stop
        STL09:47
        Ontario - St. Louis|Sat, May 4|Frontier Airlines
        US$48
        US$48
      • ONT00:59
        6h 37m
        1 stop
        STL09:36
        Ontario - St. Louis|Wed, May 22|Frontier Airlines
        US$48
        US$48
      • ONT00:59
        6h 26m
        1 stop
        STL09:25
        Ontario - St. Louis|Sat, May 18|Frontier Airlines
        US$48
        US$48
      • ONT13:00
        3h 5m
        Direct
        STL14:00
        Ontario - St. Louis|Thu, May 2|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 Ontario to St. Louis Lambert International Airport
Frontier Airlines
From US$41
United Airlines
From US$134
Delta Air Lines
From US$165
Alaska Airlines
From US$169
Southwest Airlines
From US$203
American Airlines
From US$248
ANA airlines
Find more flights and airlines

There are 1 airport(s) in Ontario. Discover the top routes now!

  • 12517.03 km from downtown Ontario
    Ontario International Airport
    Tickets From
    US$41
Flight Schedule from Ontario to St. Louis Lambert International Airport
Flight info.
Departure
Arrival
Weekly Schedule

  1. F91500

    Frontier Airlines

    00:49

    ONT

    2.4h

    04:10

    DEN

    SMTWTFS
    Search

  2. F9006

    Frontier Airlines

    07:00

    DEN

    2.1h

    10:05

    STL

    S-T-TF-

  3. F91500

    Frontier Airlines

    00:49

    ONT

    2.4h

    04:10

    DEN

    SMTWTFS
    Search

  4. F93302

    Frontier Airlines

    06:26

    DEN

    2.2h

    09:37

    STL

    -M-W--S

  5. F91262

    Frontier Airlines

    00:56

    ONT

    2.4h

    04:20

    DEN

    SMTWTFS
    Search

  6. F93302

    Frontier Airlines

    06:26

    DEN

    2.2h

    09:37

    STL

    -M-W--S

  7. F91262

    Frontier Airlines

    00:56

    ONT

    2.4h

    04:20

    DEN

    SMTWTFS
    Search

  8. F9006

    Frontier Airlines

    07:00

    DEN

    2.1h

    10:05

    STL

    S-T-TF-

  9. F91284

    Frontier Airlines

    12:34

    ONT

    1.1h

    13:43

    LAS

    SMTWT-S
    Search

  10. F94442

    Frontier Airlines

    16:40

    LAS

    3.3h

    21:57

    STL

    ---W--S

  11. F91284

    Frontier Airlines

    12:34

    ONT

    1.1h

    13:43

    LAS

    SMTWT-S
    Search

  12. F94416

    Frontier Airlines

    16:42

    LAS

    3.3h

    21:59

    STL

    -M-----

  13. F92232

    Frontier Airlines

    17:30

    ONT

    1.2h

    18:43

    LAS

    SMTWTFS
    Search

  14. F92018

    Frontier Airlines

    05:01

    LAS

    3.3h

    10:18

    STL

    SMTWTFS

  15. F93210

    Frontier Airlines

    22:59

    ONT

    1.2h

    00:13

    LAS

    SMTWTFS
    Search

  16. F92018

    Frontier Airlines

    05:01

    LAS

    3.3h

    10:18

    STL

    SMTWTFS
Find more flights and airlines

Flight Info of Flights from Ontario to St. Louis Lambert International Airport

Cheapest round-trip ticket price

$75

Cheapest nonstop flight price

$40

Off-season for travel

January

Peak season for travel

December

FAQs for Ontario to St. Louis Lambert International Airport Flights

  • 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 $329.

  • 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 20km. It takes about 40 minutes by taxi.

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