What are the cheapest airlines flying from Ontario to St. Louis round-trip?

Flying on Frontier is currently your cheapest option to St. Louis, with prices starting at $106. Additional round-trip tickets that might be worth considering are offered by Delta and American Airlines, with the lowest prices starting at $316 and $321, respectively. Frontier is priced at 68% lower than the current average price of a flight leaving 3 months from now.

What are the cheapest airlines to fly from Ontario to St. Louis one-way?

The cheapest airlines for a one-way flight from Ontario to St. Louis are Frontier ($54), Delta ($158), and American Airlines ($163).

What are the most popular airlines that fly from Ontario to St. Louis?

Before booking your flight from Ontario to St. Louis check out the most popular airlines for this route: American Airlines, Delta or Frontier.

What is the cheapest day to fly round-trip from Ontario to St. Louis?

Leaving on a Sunday is a viable option for saving on travel. Heavily demanded days of the week can typically drive up the prices you see. Booking your travel for a less competitive day can save up to 59% on the overall cost on flights from Ontario to St. Louis.

How far in advance should I book a flight from Ontario to St. Louis?

Users have found that booking a flight from Ontario to St. Louis at least 48 days early can save you up to 72% on average compared to booking a flight this week. If booking 48 days before your flight isn’t an option for you, users have found flights from Ontario to St. Louis for as little as $427 when booking for a departure date within the next two weeks. You can also check prices now. Some users have found airline tickets as low as $558 for flights departing within the next 3 days.

What is the cheapest month to fly from Ontario to St. Louis?

The best pricing can be found in the month of August. Prices to St. Louis from Ontario average $394. You can even find prices in August for less than $394, as users have found deals to St. Louis from as low as $170. The month of December appears to be one of the more expensive times to travel to St. Louis from Ontario. Flying in the targeted month can save you up to 19%.

Most accurate provider : When it comes to deals on Ontario-St. Louis flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Ontario-St. Louis flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Ontario-St. Louis flight searches over the past month and is updated monthly.

Most trusted provider : When it comes to deals on Ontario-St. Louis flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Ontario-St. Louis flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Can I find deals for flights from Ontario to St. Louis that include hotel bookings?

Yes. In addition to deals on Ontario to St. Louis flights, Cheapflights offers vacation packages that include both flights and hotel.

How can I find direct flights from Ontario to St. Louis?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to St. Louis.

Can I find deals for business class flights from Ontario to St. Louis?

Yes. Cheapflights offers flight deals from Ontario to St. Louis by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

$54+ Flights from Ontario to St. Louis

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Find cheap flights from Ontario to St. Louis with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

The best prices from Ontario to Lambert-St Louis are usually found in June or September, booked 39 days in advance, depart on a Monday or Tuesday and return on a Tuesday

Cheap flight deals from Ontario to St. Louis

Most accurate provider	FlightHub 3 stars
Most trusted provider	FlightHub 3 stars
Round-trip from	$106 (Cheapflightsfares)
One-way from	$54 (Cheapflightsfares)
Popular in	December
Cheapest in	June
Average price	$557

Provider with most accurate pricing for Ontario-Lambert-St Louis flight deals.

Search Deals

Provider most trusted by Cheapflights users for Ontario-Lambert-St Louis flights.

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From Ontario to Lambert-St Louis

Search Deals

One-way flight from Ontario to Lambert-St Louis

Search Deals

High demand for flights, 18% potential price rise

Search Deals

Best time to find cheap flights, 6% potential price drop

Search Deals

Average for round-trip flights in December 2024

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Find flight deals from Ontario to St. Louis

Cheapest flights from Ontario to St. Louis
Explore the most affordable flight options available from Ontario to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 18, 2024.

Tue 12/3112:59 amONT - STL

1 stop5h 14mFrontier

Fri 1/39:29 pmSTL - ONT

1 stop22h 41mFrontier

Deal found 12/17

$158

Tue 12/241:05 pmONT - STL

1 stop6h 29mDelta

Tue 1/215:00 pmSTL - ONT

1 stop7h 52mDelta

Deal found 12/17

$336

Tue 12/246:10 amONT - STL

1 stop8h 37mUnited Airlines

Tue 1/214:36 pmSTL - ONT

2 stops19h 15mUnited Airlines

Deal found 12/17

$440

Wed 12/2510:02 amONT - STL

2 stops7h 28mAmerican Airlines

Sun 12/295:21 amSTL - ONT

2 stops8h 45mAmerican Airlines

Deal found 12/17

$656

Sun 12/2211:55 amONT - STL

1 stop5h 45mMultiple Airlines

Tue 1/215:03 amSTL - ONT

2 stops17h 10mMultiple Airlines

Deal found 12/17

$677

Wed 12/188:35 amONT - STL

1 stop7h 50mSouthwest

Wed 12/2510:55 amSTL - ONT

2 stops8h 35mSouthwest

Deal found 12/17

$782

Mon 12/3010:40 amONT - STL

2 stops24h 47mAlaska Airlines

Mon 1/62:49 pmSTL - ONT

1 stop22h 00mAlaska Airlines

Deal found 12/16

$785

Best flights from Ontario to St. Louis
Discover carefully curated flight deals from Ontario to St. Louis that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 18, 2024.

Mon 1/61:05 pmONT - STL

1 stop5h 24mFrontier

Sat 1/116:46 pmSTL - ONT

1 stop6h 58mFrontier

Deal found 12/18

$106

Thu 1/167:56 amONT - STL

1 stop9h 35mMultiple Airlines

Thu 1/232:49 pmSTL - ONT

1 stop9h 50mMultiple Airlines

Deal found 12/17

$253

Tue 1/146:00 amONT - STL

1 stop5h 18mDelta

Tue 1/215:00 pmSTL - ONT

1 stop7h 52mDelta

Deal found 12/17

$316

Tue 1/146:10 amONT - STL

2 stops9h 12mAmerican Airlines

Tue 1/2111:38 amSTL - ONT

1 stop8h 59mAmerican Airlines

Deal found 12/17

$321

Fri 2/711:33 amONT - STL

1 stop10h 26mAlaska Airlines

Mon 2/102:49 pmSTL - ONT

1 stop9h 50mAlaska Airlines

Deal found 12/16

$338

Tue 2/45:10 amONT - STL

1 stop5h 38mUnited Airlines

Tue 2/118:27 amSTL - ONT

1 stop6h 14mUnited Airlines

Deal found 12/16

$388

Thu 3/132:50 pmONT - STL

2 stops7h 45mSouthwest

Sat 3/151:45 pmSTL - ONT

2 stops12h 25mSouthwest

Deal found 12/17

$546

Last-minute flights from Ontario to St. Louis
Discover last-minute flight deals from Ontario to St. Louis. Data last updated December 18, 2024 and is based on user searches.

Wed 12/188:35 amONT - STL

1 stop7h 50mSouthwest

Wed 12/2510:55 amSTL - ONT

2 stops8h 35mSouthwest

Deal found 12/17

$782

Tue 12/241:05 pmONT - STL

1 stop6h 29mDelta

Tue 1/215:00 pmSTL - ONT

1 stop7h 52mDelta

Deal found 12/17

$336

Tue 12/246:10 amONT - STL

1 stop8h 37mUnited Airlines

Tue 1/214:36 pmSTL - ONT

2 stops19h 15mUnited Airlines

Deal found 12/17

$440

Tue 12/2412:59 amONT - STL

1 stop5h 14mMultiple Airlines

Sun 12/297:24 amSTL - ONT

2 stops14h 13mMultiple Airlines

Deal found 12/17

$987

Wed 12/2510:02 amONT - STL

2 stops7h 28mAmerican Airlines

Sun 12/295:21 amSTL - ONT

2 stops8h 45mAmerican Airlines

Deal found 12/17

$656

Thu 12/2610:31 pmONT - STL

1 stop19h 58mFrontier

Thu 1/212:00 pmSTL - ONT

1 stop27h 00mFrontier

Deal found 12/17

$198

Thu 12/268:32 pmONT - STL

2 stops14h 55mAlaska Airlines

Sun 1/52:23 pmSTL - ONT

1 stop10h 16mAlaska Airlines

Deal found 12/18

$1,053

Mon 1/61:05 pmONT - STL

1 stop5h 24mFrontier

Sat 1/116:46 pmSTL - ONT

1 stop6h 58mFrontier

Deal found 12/18

$106

Tue 1/146:00 amONT - STL

1 stop5h 18mDelta

Tue 1/215:00 pmSTL - ONT

1 stop7h 52mDelta

Deal found 12/17

$316

Tue 1/146:10 amONT - STL

2 stops9h 12mAmerican Airlines

Tue 1/2111:38 amSTL - ONT

1 stop8h 59mAmerican Airlines

Deal found 12/17

$321

Wed 1/156:00 amONT - STL

1 stop29h 53mAlaska Airlines

Wed 2/122:49 pmSTL - ONT

2 stops11h 09mAlaska Airlines

Deal found 12/17

$372

Wed 1/155:10 amONT - STL

1 stop5h 38mUnited Airlines

Wed 2/124:36 pmSTL - ONT

1 stop7h 21mUnited Airlines

Deal found 12/17

$406

One-way flights from Ontario to St. Louis
Search for one-way flight options from Ontario to St. Louis. Find affordable one-way fares based on user searches. Data last updated December 18, 2024.

Fri 2/1412:59 amONT - STL

1 stop6h 17mFrontier

Deal found 12/17

$54

Tue 1/71:00 pmONT - STL

1 stop8h 37mDelta

Deal found 12/17

$158

Wed 1/2212:48 pmONT - STL

2 stops8h 08mAmerican Airlines

Deal found 12/17

$163

Wed 2/197:00 amONT - STL

2 stops14h 59mAlaska Airlines

Deal found 12/17

$178

Wed 1/226:00 amONT - STL

1 stop6h 37mUnited Airlines

Deal found 12/17

$203

Fri 1/176:25 amONT - STL

2 stops9h 45mSouthwest

Deal found 12/17

$213

Find flights from Ontario to St. Louis within your budget

Fly from

Fly to

Route

Depart

Return

Price

OntarioSt. Louis

ONT - STL

ONTSTL

Ontario

Mon 1/6

1:05 pm-8:29 pm

1 stop5h 24m

Lambert-St Louis

Sat 1/11

6:46 pm-11:44 pm

1 stop6h 58m

$106

OntarioSt. Louis

ONT - STL

ONTSTL

Ontario

Thu 1/16

7:56 am-7:31 pm

1 stop9h 35m

Lambert-St Louis

Thu 1/23

2:49 pm-10:39 pm

1 stop9h 50m

$253

OntarioSt. Louis

ONT - STL

ONTSTL

Ontario

Tue 1/14

6:00 am-1:18 pm

1 stop5h 18m

Lambert-St Louis

Tue 1/21

5:00 pm-10:52 pm

1 stop7h 52m

$316

OntarioSt. Louis

ONT - STL

ONTSTL

Ontario

Tue 1/14

6:10 am-5:22 pm

2 stops9h 12m

Lambert-St Louis

Tue 1/21

11:38 am-6:37 pm

1 stop8h 59m

$321

OntarioSt. Louis

ONT - STL

ONTSTL

Ontario

Fri 2/7

11:33 am-11:59 pm

1 stop10h 26m

Lambert-St Louis

Sun 2/9

2:49 pm-11:12 pm

1 stop10h 23m

$338

OntarioSt. Louis

ONT - STL

ONTSTL

Ontario

Tue 2/4

5:10 am-12:48 pm

1 stop5h 38m

Lambert-St Louis

Tue 2/11

8:27 am-12:41 pm

1 stop6h 14m

$388

OntarioSt. Louis

ONT - STL

ONTSTL

Ontario

Thu 3/13

2:50 pm-12:35 am

2 stops7h 45m

Lambert-St Louis

Sat 3/15

1:45 pm-12:10 am

2 stops12h 25m

$546

OntarioSt. Louis

ONT - STL

ONTSTL

Ontario

Fri 2/14

12:59 am-9:16 am

1 stop6h 17m

$54

OntarioSt. Louis

ONT - STL

ONTSTL

Ontario

Tue 1/7

1:00 pm-11:37 pm

1 stop8h 37m

$158

OntarioSt. Louis

ONT - STL

ONTSTL

Ontario

Wed 1/22

12:48 pm-10:56 pm

2 stops8h 08m

$163

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/17

Showing 1-10 of 13 results

Compare providers for flights from Ontario to St. Louis

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Ontario to St. Louis in December.

Provider	Price Accuracy	Trust Score*
Expedia	Price Accuracy1 star	Trust Score*3 stars
FlightHub	Price Accuracy3 stars	Trust Score*3 stars
eDreams	Price Accuracy3 stars	Trust Score*3 stars
Priceline	Price Accuracy1 star	Trust Score*3 stars
Mytrip	Price Accuracy3 stars	Trust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

Most accurate provider: When it comes to deals on Ontario-St. Louis flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Ontario-St. Louis flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Ontario-St. Louis flight searches over the past month and is updated monthly.
Most trusted provider: When it comes to deals on Ontario-St. Louis flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Ontario-St. Louis flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Ontario to St. Louis

Have a flexible travel schedule? Discover the best time to fly to St. Louis from Ontario with our price prediction graph.

Estimated round-trip price

Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Travel insights for flights from Ontario to St. Louis

Get recent, data-driven insights about flights from Ontario to St. Louis including ideal travel times, pricing trends, and more.

How far ahead should I book a flight from Ontario to St. Louis?

The best time to book flights from Ontario to St. Louis is 38 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

What is the cheapest month to book a flight from Ontario to St. Louis?

Currently, August is the cheapest month in which you can book a flight from Ontario to St. Louis (average of $311). Flying from Ontario to St. Louis in March is currently the most expensive (average of $356). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from ONT to STL?

A simple way to save on the total cost of your ticket is to fly from Ontario to St. Louis in the evening. If you’re flexible enough to do this you can expect to save up to 60% on your trip compared to booking a flight in the afternoon.

What is the cheapest day to fly from Ontario to St. Louis?

Travelers seeking maximum savings on their Ontario to St. Louis flight should consider departing on Wednesday at noon when fares are most often at their lowest. Monday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

Rainfall in St. Louis by month

In terms of precipitation, rainfall in St. Louis ranges from 2.2 - 4.7 inches per month. May is typically the wettest month, when rainfall can reach 4.7 in. February is typically the driest time to visit St. Louis when rainfall is around 2.2 in.

Temperature in St. Louis by month

If weather is an important factor for your trip to St. Louis, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 80.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 32.0 F).

Reviews of airlines servicing St. Louis

Read through reviews of airlines operating flights from Ontario to St. Louis, such as Alaska Airlines, United Airlines and Frontier. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Southwest

8.1

Very good

4,848 reviews

Reviews

1 / 10

My original flight was delayed so they found this flight for me so I could arrive at a reasonable time

Southwest

8.1

Very good

4,848 reviews

Southwest

8.1

Very good

4,848 reviews

Reviews

1 / 10

My original flight was delayed so they found this flight for me so I could arrive at a reasonable time

Alaska Airlines

8.0

Very good

9,554 reviews

Southwest

8.1

Very good

4,848 reviews

Reviews

1 / 10

My original flight was delayed so they found this flight for me so I could arrive at a reasonable time

Delta

8.0

Very good

8,604 reviews

Southwest

8.1

Very good

4,848 reviews

Reviews

1 / 10

My original flight was delayed so they found this flight for me so I could arrive at a reasonable time

United Airlines

7.4

Good

9,055 reviews

Southwest

8.1

Very good

4,848 reviews

Reviews

1 / 10

My original flight was delayed so they found this flight for me so I could arrive at a reasonable time

American Airlines

7.2

Good

10,000 reviews

Southwest

8.1

Very good

4,848 reviews

Reviews

1 / 10

My original flight was delayed so they found this flight for me so I could arrive at a reasonable time

Related info for your journey

What are the cheapest airlines flying from Ontario to St. Louis round-trip?
Flying on Frontier is currently your cheapest option to St. Louis, with prices starting at $106. Additional round-trip tickets that might be worth considering are offered by Delta and American Airlines, with the lowest prices starting at $316 and $321, respectively. Frontier is priced at 68% lower than the current average price of a flight leaving 3 months from now.
What are the cheapest airlines to fly from Ontario to St. Louis one-way?
The cheapest airlines for a one-way flight from Ontario to St. Louis are Frontier ($54), Delta ($158), and American Airlines ($163).
Can I find deals for flights from Ontario to St. Louis that include hotel bookings?
Yes. In addition to deals on Ontario to St. Louis flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Ontario to St. Louis?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to St. Louis.
Can I find deals for business class flights from Ontario to St. Louis?
Yes. Cheapflights offers flight deals from Ontario to St. Louis by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.
What is the cheapest month to book a flight from Ontario to St. Louis?
Currently, August is the cheapest month in which you can book a flight from Ontario to St. Louis (average of $311). Flying from Ontario to St. Louis in March is currently the most expensive (average of $356). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Top 5 airlines flying from Ontario to St. Louis

Airline	Cheapest	Average	Flexibility	On-time
Frontier	Cheapest$104	Average$183	FlexibilityNo cancel fee	On-time62%
Delta	Cheapest$276	Average$427	FlexibilityNo cancel fee	On-timeN/A
American Airlines	Cheapest$282	Average$434	FlexibilityNo cancel fee	On-time71%
United Airlines	Cheapest$288	Average$481	FlexibilityNo cancel fee	On-time69%
Southwest	Cheapest$326	Average$386	FlexibilityNo cancel fee	On-time63%

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$54+ Cheap flights from Ontario to St. Louis (ONT - STL)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 2/14. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Ontario to St. Louis with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

The best prices from Ontario to Lambert-St Louis are usually found in June or September, booked 39 days in advance, depart on a Monday or Tuesday and return on a Tuesday

Cheap flight deals from Ontario to St. Louis

Most accurate provider

Most trusted provider

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Find flight deals from Ontario to St. Louis

Cheapest flights from Ontario to St. LouisExplore the most affordable flight options available from Ontario to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 18, 2024.

Explore the most affordable flight options available from Ontario to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 18, 2024.

Find flights from Ontario to St. Louis within your budget

Compare providers for flights from Ontario to St. Louis

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Ontario to St. Louis in December.

Best time to book a flight from Ontario to St. Louis

Have a flexible travel schedule? Discover the best time to fly to St. Louis from Ontario with our price prediction graph.

Travel insights for flights from Ontario to St. Louis

Get recent, data-driven insights about flights from Ontario to St. Louis including ideal travel times, pricing trends, and more.

How far ahead should I book a flight from Ontario to St. Louis?

Use this chart to determine the optimal time to book a round-trip flight from Ontario to St. Louis. Price data was last updated on December 13, 2024.

What is the cheapest month to book a flight from Ontario to St. Louis?

What is the cheapest time of day to fly from ONT to STL?

Find hourly flight availability from Ontario to St. Louis. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated December 18, 2024.

What is the cheapest day to fly from Ontario to St. Louis?

Use this chart to determine the cheapest time to fly round-trip from Ontario to St. Louis. Price data was last updated on December 16, 2024.

Rainfall in St. Louis by month

Plan your trip to St. Louis by taking into account the average rainfall totals by month.

Temperature in St. Louis by month

Plan your trip to St. Louis by taking into account the average temperature totals by month.

Reviews of airlines servicing St. Louis

Read through reviews of airlines operating flights from Ontario to St. Louis, such as Alaska Airlines, United Airlines and Frontier. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

Find useful and relevant information for your journey from Ontario to St. Louis. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

What are the cheapest airlines flying from Ontario to St. Louis round-trip?

What are the cheapest airlines to fly from Ontario to St. Louis one-way?

Can I find deals for flights from Ontario to St. Louis that include hotel bookings?

How can I find direct flights from Ontario to St. Louis?

Can I find deals for business class flights from Ontario to St. Louis?

What is the cheapest month to book a flight from Ontario to St. Louis?

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Ontario to St. Louis

See prices for flight routes from nearby airports that may be better suited for you.

Top 5 airlines flying from Ontario to St. Louis

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Travel Smart

Cheapest flights from Ontario to St. Louis
Explore the most affordable flight options available from Ontario to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 18, 2024.