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Cheap flights from Ontario to St. Louis (ONT - STL) from $51

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 5/18. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
ONT — STL
May 2 — May 91
From?
To?
Thu 5/2
Thu 5/9
1 adult, Economy
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The best prices from Ontario to Lambert-St Louis are usually found in November or October, booked 60 days in advance, depart on a Saturday or Wednesday and return on a Thursday

Cheap flight deals from Ontario to St. Louis

Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to St. Louis (STL). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated April 27, 2024.

Popular in

June

Cheapest in

November

Round-trip from

$323

One-way from

$51
High demand for flights, 30% potential price rise
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Best time to find cheap flights, 49% potential price drop
Search Deals
From Ontario to Lambert-St Louis
Search Deals
One-way flight from Ontario to Lambert-St Louis
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What is the cheapest day to fly round-trip from Ontario to St. Louis?

Leaving on a Friday 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 114% 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 53 days early can save you up to 106% on average compared to booking a flight this week. If booking 53 days before your flight isn’t an option for you, users have found flights from Ontario to St. Louis for as little as $566 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 $746 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 February. Prices to St. Louis from Ontario average $454. You can even find prices in February for less than $454, as users have found deals to St. Louis from as low as $258. 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 10%.

When is the cheapest time to fly from Ontario to St. Louis (ONT - 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 34% on your trip compared to booking a flight at noon.

Cheap Frontier flights from Ontario to St. Louis

Explore cheap flight options specifically provided by Frontier for the route between Ontario and St. Louis. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 2,991,349 searches. Data last updated April 27, 2024.
Peruse some of the lowest-priced Frontier flights we've found from Ontario to St. Louis. Come back soon if you're not finding the exact deal you're looking for.
Fri 5/1711:04 pmONT - STL
1 stop9h 09mFrontier
Sat 5/1811:41 pmSTL - ONT
1 stop8h 36mFrontier
Deal found 4/26$100
Fri 5/1010:29 pmONT - STL
1 stop11h 10mFrontier
Sat 5/1811:41 pmSTL - ONT
1 stop8h 36mFrontier
Deal found 4/26$113
Tue 5/1412:39 pmONT - STL
1 stop7h 20mFrontier
Thu 5/167:23 pmSTL - ONT
1 stop25h 00mFrontier
Deal found 4/26$117
Tue 5/2112:59 amONT - STL
1 stop6h 37mFrontier
Sat 5/2511:41 pmSTL - ONT
1 stop8h 36mFrontier
Deal found 4/26$123
Thu 5/1612:59 amONT - STL
1 stop6h 37mFrontier
Sat 5/1811:41 pmSTL - ONT
1 stop8h 36mFrontier
Deal found 4/26$125
Fri 5/312:55 amONT - STL
1 stop6h 52mFrontier
Wed 5/158:04 pmSTL - ONT
1 stop5h 55mFrontier
Deal found 4/27$127
Mon 5/1312:59 amONT - STL
1 stop12h 51mFrontier
Fri 5/178:45 pmSTL - ONT
1 stop12h 49mFrontier
Deal found 4/26$129
Sat 5/255:41 pmONT - STL
1 stop20h 30mFrontier
Sat 6/18:04 pmSTL - ONT
1 stop5h 55mFrontier
Deal found 4/25$132
Mon 5/1312:59 amONT - STL
1 stop12h 51mFrontier
Thu 5/167:23 pmSTL - ONT
1 stop25h 00mFrontier
Deal found 4/26$133

Cheap American Airlines flights from Ontario to St. Louis

Explore cheap flight options specifically provided by American Airlines for the route between Ontario and St. Louis. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 2,991,349 searches. Data last updated April 27, 2024.
Browse through some of the cheapest American Airlines flights traveling from Ontario to St. Louis. Deals frequently update to provide users with more options.
Thu 9/2611:59 pmONT - STL
1 stop7h 01mAmerican Airlines
Wed 10/99:50 amSTL - ONT
2 stops7h 57mAmerican Airlines
Deal found 4/26$389
Fri 9/2712:40 pmONT - STL
2 stops7h 44mAmerican Airlines
Tue 10/82:35 pmSTL - ONT
1 stop5h 42mAmerican Airlines
Deal found 4/26$430
Tue 5/2812:53 pmONT - STL
2 stops8h 06mAmerican Airlines
Tue 6/47:01 amSTL - ONT
1 stop6h 51mAmerican Airlines
Deal found 4/27$441
Thu 8/154:45 pmONT - STL
1 stop5h 04mAmerican Airlines
Sun 8/185:54 amSTL - ONT
2 stops7h 50mAmerican Airlines
Deal found 4/27$450
Wed 8/1412:40 pmONT - STL
2 stops7h 44mAmerican Airlines
Sat 8/172:38 pmSTL - ONT
1 stop9h 22mAmerican Airlines
Deal found 4/27$459
Thu 9/266:15 amONT - STL
2 stops8h 59mAmerican Airlines
Wed 10/99:50 amSTL - ONT
2 stops7h 57mAmerican Airlines
Deal found 4/26$466
Thu 5/166:00 amONT - STL
1 stop6h 13mAmerican Airlines
Sun 5/195:21 amSTL - ONT
2 stops8h 26mAmerican Airlines
Deal found 4/27$486
Fri 5/102:50 pmONT - STL
1 stop6h 09mAmerican Airlines
Sun 5/125:21 amSTL - ONT
2 stops8h 26mAmerican Airlines
Deal found 4/26$507
Sun 7/712:59 amONT - STL
1 stop6h 30mAmerican Airlines
Mon 7/1510:19 amSTL - ONT
2 stops10h 03mAmerican Airlines
Deal found 4/26$563

Cheap Ontario to St. Louis flights in April & May 2024

Find cheap flight options from Ontario to St. Louis specifically for the months of April and May 2024. Explore affordable fares based on user searches. Over the last 7 days, Cheapflights users made 2,991,349 searches. Prices were last updated on April 27, 2024.
These are some of the most attractive deals on flights from Ontario to St. Louis in 2024. More deals are always being added, so be sure to check back regularly.
Fri 5/1711:04 pmONT - STL
1 stop9h 09mFrontier
Sat 5/1811:41 pmSTL - ONT
1 stop8h 36mFrontier
Deal found 4/26$100
Fri 5/1010:29 pmONT - STL
1 stop11h 10mFrontier
Sat 5/1811:41 pmSTL - ONT
1 stop8h 36mFrontier
Deal found 4/26$113
Tue 5/1412:39 pmONT - STL
1 stop7h 20mFrontier
Thu 5/167:23 pmSTL - ONT
1 stop25h 00mFrontier
Deal found 4/26$117
Tue 5/2112:59 amONT - STL
1 stop6h 37mFrontier
Sat 5/2511:41 pmSTL - ONT
1 stop8h 36mFrontier
Deal found 4/26$123
Thu 5/1612:59 amONT - STL
1 stop6h 37mFrontier
Sat 5/1811:41 pmSTL - ONT
1 stop8h 36mFrontier
Deal found 4/26$125
Fri 5/312:55 amONT - STL
1 stop6h 52mFrontier
Wed 5/158:04 pmSTL - ONT
1 stop5h 55mFrontier
Deal found 4/27$127
Mon 5/1312:59 amONT - STL
1 stop12h 51mFrontier
Fri 5/178:45 pmSTL - ONT
1 stop12h 49mFrontier
Deal found 4/26$129
Sat 5/255:41 pmONT - STL
1 stop20h 30mFrontier
Sat 6/18:04 pmSTL - ONT
1 stop5h 55mFrontier
Deal found 4/25$132
Mon 5/1312:59 amONT - STL
1 stop12h 51mFrontier
Thu 5/167:23 pmSTL - ONT
1 stop25h 00mFrontier
Deal found 4/26$133

Ontario to St. Louis 2024 flight deals

Discover exclusive flight deals for travel between Ontario and St. Louis in 2024. Find excellent offers based on user searches. Over the last 7 days, Cheapflights users made 2,991,349 searches. Data last updated April 27, 2024.
These are some of the most attractive deals on flights from Ontario to St. Louis in 2024. More deals are always being added, so be sure to check back regularly.
Fri 5/1711:04 pmONT - STL
1 stop9h 09mFrontier
Sat 5/1811:41 pmSTL - ONT
1 stop8h 36mFrontier
Deal found 4/26$100
Fri 5/1010:29 pmONT - STL
1 stop11h 10mFrontier
Sat 5/1811:41 pmSTL - ONT
1 stop8h 36mFrontier
Deal found 4/26$113
Tue 5/1412:39 pmONT - STL
1 stop7h 20mFrontier
Thu 5/167:23 pmSTL - ONT
1 stop25h 00mFrontier
Deal found 4/26$117
Tue 5/2112:59 amONT - STL
1 stop6h 37mFrontier
Sat 5/2511:41 pmSTL - ONT
1 stop8h 36mFrontier
Deal found 4/26$123
Thu 5/1612:59 amONT - STL
1 stop6h 37mFrontier
Sat 5/1811:41 pmSTL - ONT
1 stop8h 36mFrontier
Deal found 4/26$125
Fri 5/312:55 amONT - STL
1 stop6h 52mFrontier
Wed 5/158:04 pmSTL - ONT
1 stop5h 55mFrontier
Deal found 4/27$127
Mon 5/1312:59 amONT - STL
1 stop12h 51mFrontier
Fri 5/178:45 pmSTL - ONT
1 stop12h 49mFrontier
Deal found 4/26$129
Sat 5/255:41 pmONT - STL
1 stop20h 30mFrontier
Sat 6/18:04 pmSTL - ONT
1 stop5h 55mFrontier
Deal found 4/25$132
Mon 5/1312:59 amONT - STL
1 stop12h 51mFrontier
Thu 5/167:23 pmSTL - ONT
1 stop25h 00mFrontier
Deal found 4/26$133

Ontario to St. Louis flights leaving soon

Find last-minute flight options from Ontario to St. Louis for spontaneous travel. Discover available flights and compare prices based on user searches. Secure great deals and offers for spontaneous trips with quick booking options. Over the last 7 days, Cheapflights users made 2,991,349 searches. Data last updated April 27, 2024.
Have a look at some of the flights available from Ontario to St. Louis departing last-minute. Tip: verify your flight details before completing your reservation.
Fri 5/312:55 amONT - STL
1 stop6h 52mFrontier
Wed 5/158:04 pmSTL - ONT
1 stop5h 55mFrontier
Deal found 4/27$127
Mon 5/66:51 pmONT - STL
1 stop13h 27mFrontier
Fri 5/107:51 pmSTL - ONT
1 stop28h 07mFrontier
Deal found 4/26$147
Fri 5/312:55 amONT - STL
1 stop6h 52mFrontier
Tue 5/144:50 pmSTL - ONT
1 stop9h 09mFrontier
Deal found 4/27$153
Mon 5/66:51 pmONT - STL
1 stop13h 27mFrontier
Fri 5/107:51 pmSTL - ONT
1 stop28h 07mFrontier
Deal found 4/27$158
Fri 5/310:59 pmONT - STL
1 stop9h 19mFrontier
Mon 5/67:51 pmSTL - ONT
1 stop28h 06mFrontier
Deal found 4/25$163
Fri 5/310:29 pmONT - STL
1 stop11h 10mFrontier
Fri 5/107:51 pmSTL - ONT
1 stop18h 35mFrontier
Deal found 4/26$164
Fri 5/310:29 pmONT - STL
1 stop11h 10mFrontier
Sat 5/48:04 pmSTL - ONT
1 stop12h 27mFrontier
Deal found 4/26$165
Fri 5/310:59 pmONT - STL
1 stop9h 19mFrontier
Sun 5/57:51 pmSTL - ONT
1 stop28h 06mFrontier
Deal found 4/26$171
Thu 5/210:58 pmONT - STL
1 stop9h 20mFrontier
Tue 5/1410:59 pmSTL - ONT
1 stop15h 01mFrontier
Deal found 4/26$178

One-way flights to St. Louis from Ontario

Search for one-way flight options from Ontario to St. Louis. Find affordable one-way fares based on user searches. Compare prices and availability to plan your one-way journey according to your preferred dates and budget. Over the last 7 days, Cheapflights users made 2,991,349 searches. Data last updated April 27, 2024.
Users in need of a one-way flight from Ontario to St. Louis can choose from these deals. Users in need of a round-trip flight from Ontario to St. Louis instead should update the search form at the top of page.
Sat 5/1810:10 pmONT - STL
1 stop10h 03mFrontier
Deal found 4/26$51
Fri 5/1711:04 pmONT - STL
1 stop9h 09mFrontier
Deal found 4/26$61
Fri 5/1712:59 amONT - STL
1 stop6h 26mFrontier
Deal found 4/26$71
Tue 5/712:39 pmONT - STL
1 stop7h 20mFrontier
Deal found 4/26$80
Sat 5/48:01 pmONT - STL
1 stop12h 17mFrontier
Deal found 4/26$86
Mon 5/612:59 amONT - STL
1 stop12h 51mFrontier
Deal found 4/26$90
Fri 5/310:59 pmONT - STL
1 stop9h 19mFrontier
Deal found 4/26$91
Thu 8/155:30 pmONT - STL
1 stop14h 48mFrontier
Deal found 4/27$92
Fri 9/68:35 pmONT - STL
1 stop11h 43mFrontier
Deal found 4/26$95

Find flights from Ontario to St. Louis within your budget

Customize your flight search to find flights from Ontario to St. Louis that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,991,349 searches. Data last updated April 27, 2024.

Fly from

Any airport

Fly to

Any airport

Budget

$100 - $389

Route

Depart

Return

Price

OntarioLambert-St Louis

ONT - STL

ONTSTL

Ontario

Fri 5/17

1 stop9h 09m

Lambert-St Louis

Sat 5/18

1 stop8h 36m

$100

OntarioLambert-St Louis

ONT - STL

ONTSTL

Ontario

Fri 5/10

1 stop11h 10m

Lambert-St Louis

Sat 5/18

1 stop8h 36m

$113

OntarioLambert-St Louis

ONT - STL

ONTSTL

Ontario

Tue 5/14

1 stop7h 20m

Lambert-St Louis

Thu 5/16

1 stop25h 00m

$117

OntarioLambert-St Louis

ONT - STL

ONTSTL

Ontario

Tue 5/21

1 stop6h 37m

Lambert-St Louis

Sat 5/25

1 stop8h 36m

$123

OntarioLambert-St Louis

ONT - STL

ONTSTL

Ontario

Thu 5/16

1 stop6h 37m

Lambert-St Louis

Sat 5/18

1 stop8h 36m

$125

OntarioLambert-St Louis

ONT - STL

ONTSTL

Ontario

Mon 5/13

1 stop12h 51m

Lambert-St Louis

Fri 5/17

1 stop12h 49m

$129

OntarioLambert-St Louis

ONT - STL

ONTSTL

Ontario

Wed 7/10

1 stop5h 39m

Lambert-St Louis

Tue 7/16

1 stop8h 54m

$344

OntarioLambert-St Louis

ONT - STL

ONTSTL

Ontario

Fri 5/17

2 stops9h 31m

Lambert-St Louis

Sat 5/18

1 stop8h 36m

$369

OntarioLambert-St Louis

ONT - STL

ONTSTL

Ontario

Thu 9/26

1 stop7h 01m

Lambert-St Louis

Wed 10/9

2 stops7h 57m

$389

Flights are sorted by cheapest first

Deals found on 4/26

When is the best time to 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 January 28, 2024.
The best time to book flights from Ontario to St. Louis is 60 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.
Search Deals

When is the cheapest time 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 April 21, 2024.
Morning
Noon
Afternoon
Evening
All times are departure.
Travelers seeking maximum savings on their Ontario to St. Louis flight should consider departing on Wednesday evenings when fares are most often at their lowest. Monday mornings flights should be avoided if possible as fares are typically the most expensive at this time.
Search Deals

Average price of flights to St. Louis by month

Plan your trip from Ontario to St. Louis by taking into account the cheapest months to travel. The average price of a one-way flight from Ontario to St. Louis is currently $80 while a round-trip flight costs $201. Price data was last updated on April 21, 2024.

Currently, September is the cheapest month in which you can book a flight from Ontario to St. Louis (average of $323). Flying from Ontario to St. Louis in July is currently the most expensive (average of $378). 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.

January

$326

February

$331

March

$357

April

$337

May

$350

June

$373

July

$378

August

$336

September

$323

October

$323

November

$336

December

$326

Temperature and rainfall in St. Louis by month

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

STL

Temperature

32 - 80.6 °F

Reviews of airlines servicing St. Louis

Get insights into the airlines that provide service to St. Louis. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to St. Louis. Reviews last updated April 27, 2024.
Read through reviews of airlines operating flights from Ontario to St. Louis, such as Frontier, American Airlines and United Airlines. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.1
Very good
9,117 reviews
Check prices

Overall

8.1

Boarding

8.2

Comfort

7.9

Crew

8.6

Food

7.3

Entertainment

7.3

Reviews

1 / 10

Paid a lot for our exit row seats and they weren’t that roomy.

Alaska Airlines
8.1
Very good
9,117 reviews
Alaska Airlines
8.1
Very good
9,117 reviews
Check prices

Overall

8.1

Boarding

8.2

Comfort

7.9

Crew

8.6

Food

7.3

Entertainment

7.3

Reviews

1 / 10

Paid a lot for our exit row seats and they weren’t that roomy.

Delta
8.1
Very good
10,951 reviews
Alaska Airlines
8.1
Very good
9,117 reviews
Check prices

Overall

8.1

Boarding

8.2

Comfort

7.9

Crew

8.6

Food

7.3

Entertainment

7.3

Reviews

1 / 10

Paid a lot for our exit row seats and they weren’t that roomy.

Avianca
7.5
Good
3,909 reviews
Alaska Airlines
8.1
Very good
9,117 reviews
Check prices

Overall

8.1

Boarding

8.2

Comfort

7.9

Crew

8.6

Food

7.3

Entertainment

7.3

Reviews

1 / 10

Paid a lot for our exit row seats and they weren’t that roomy.

United Airlines
7.4
Good
11,228 reviews
Alaska Airlines
8.1
Very good
9,117 reviews
Check prices

Overall

8.1

Boarding

8.2

Comfort

7.9

Crew

8.6

Food

7.3

Entertainment

7.3

Reviews

1 / 10

Paid a lot for our exit row seats and they weren’t that roomy.

American Airlines
7.3
Good
14,875 reviews
Alaska Airlines
8.1
Very good
9,117 reviews
Check prices

Overall

8.1

Boarding

8.2

Comfort

7.9

Crew

8.6

Food

7.3

Entertainment

7.3

Reviews

1 / 10

Paid a lot for our exit row seats and they weren’t that roomy.

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.

  • Can I find flights from Ontario to St. Louis for under $100 on Cheapflights?

    Yes, there are multiple flights from Ontario to St. Louis for under $100. The cheapest flight booked recently is on Frontier for just $100, but on average you can expect to pay $142.

  • Are there last-minute flights available from Ontario to St. Louis for under $200?

    There are currently 20+ open flights from Ontario to St. Louis within the next 7 days for less than $200.

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

    Flying on Frontier is currently your cheapest option to St. Louis, with prices starting at $100. Frontier is priced at 73% lower than the current average price of a flight leaving 3 months from now.

  • 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 does ONT to STL mean?

    These are just IATA (International Air Transport Association) codes. They are used in aviation to identify and differentiate airports. That’s why a Ontario Airport to Lambert-St Louis Airport flight would often be abbreviated as a ONT to STL flight.

  • Can I find deals for flights from Ontario to St. Louis that include extra baggage allowance?

    The amount of baggage you can bring on your Ontario to St. Louis flight depends on the airline and the type of fare you've chosen. After entering your flight details, you'll be able to view the specific baggage policies for each deal in the search results. Keep in mind that certain deals may offer additional baggage allowance.

  • Can I find deals on flights from Ontario to St. Louis with specific airlines?

    Yes, Cheapflights allows you to browse and filter Ontario to St. Louis flight deals by airline. After entering your origin and destination, use the available filters to view flights offered by airlines.

  • 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.

  • Can I find deals for flights from Ontario to St. Louis that allow pets onboard?

    Many airlines flying from Ontario to St. Louis offer the option to travel with pets. After selecting a flight deal, you can find more information about the airline's pet policy on their official website or by contacting the airline directly. Please note that additional fees and restrictions may apply.

  • Can I find deals on last-minute flights from Ontario to St. Louis?

    Yes, you can often find last-minute deals on Ontario to St. Louis flights on Cheapflights. However, these deals can vary and may not always be available. We recommend checking back frequently or signing up for price alerts for the most up-to-date deals.

  • How recently were the Ontario to St. Louis flight deals updated?

    The Ontario to St. Louis flight deals you see on this page were last updated on 4/27.

See more FAQs

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Top 4 airlines flying from Ontario to St. Louis

Discover the top 4 airlines that operate flights from Ontario to St. Louis. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,991,349 searches. Data last updated April 27, 2024.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$104Average$209FlexibilityNo cancel feeOn-time62%
Search Frontier flights
DeltaCheapest$282Average$464FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
American AirlinesCheapest$282Average$468FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
United AirlinesCheapest$315Average$428FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
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Search flights from Ontario to St. Louis by cabin class

Find flights from Ontario to St. Louis, based on your preferred cabin class, be it economy, premium economy, business, or first class.
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Hourly flight availability from Ontario to St. Louis

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 April 27, 2024.
0%of flight departuresEarly morningMidnight to 6 am
100%of flight departuresMorning6 am to noon
0%of flight departuresAfternoonNoon to 6 pm
0%of flight departuresEvening6 pm to midnight
Midnight
6 AM
Noon
6 PM

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How does Cheapflights help users find flights from Ontario to St. Louis?

Cheapflights makes it easy to find Ontario to St. Louis flights by helping our users search from 900+ travel sites for deals. We also provide you with filters for cabin, price, airline, airports, number of stops, and many more to narrow down that perfect flight.

Why should you use Cheapflights to find cheap flight tickets from Ontario to St. Louis?

Cheapflights helps you find that perfect flight to St. Louis from Ontario by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

Can Cheapflights find flights from Ontario to St. Louis with no change fees?

Yes, we can. To see specific flights from Ontario to St. Louis with no change fees, users can toggle flexible booking options after using the search form above to find flights.

Can Cheapflights notify me if prices for flights from Ontario to St. Louis become cheaper?

Yes, Cheapflights offers price alerts on Ontario to St. Louis flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

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