HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news

Cheap flights from Ontario to St. Louis (ONT - STL) from $70

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 6/4. 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 21 — May 281
From?
To?
Tue 5/21
Tue 5/28
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

The best prices from Ontario to Lambert-St Louis are usually found in October or November, booked 36 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 May 16, 2024.

Popular in

December

Cheapest in

October

Round-trip from

$320

One-way from

$208
High demand for flights, 38% potential price rise
Search Deals
Best time to find cheap flights, 31% potential price drop
Search Deals
From Ontario to Lambert-St Louis
Search Deals
One-way flight from Ontario to Lambert-St Louis
Search Deals

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 120% 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 146% 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 $462 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 $677 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 January. Prices to St. Louis from Ontario average $416. You can even find prices in January for less than $416, as users have found deals to St. Louis from as low as $215. The month of July 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 12%.

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 44% 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 2,637,452 searches. Data last updated May 16, 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 5/316:01 pmONT - STL
1 stop14h 12mFrontier
Mon 6/38:04 pmSTL - ONT
1 stop5h 55mFrontier
Deal found 5/15$127
Tue 5/2112:59 amONT - STL
1 stop6h 37mFrontier
Tue 5/282:12 pmSTL - ONT
1 stop27h 53mFrontier
Deal found 5/14$137
Sun 5/1911:30 pmONT - STL
1 stop8h 43mFrontier
Thu 5/3011:06 pmSTL - ONT
1 stop26h 53mFrontier
Deal found 5/16$139
Sat 6/110:10 pmONT - STL
1 stop10h 03mFrontier
Thu 6/63:32 pmSTL - ONT
1 stop10h 12mFrontier
Deal found 5/16$140
Fri 5/3112:27 pmONT - STL
1 stop19h 46mFrontier
Sun 6/211:22 pmSTL - ONT
1 stop26h 37mFrontier
Deal found 5/15$141
Sun 5/196:09 pmONT - STL
1 stop14h 04mFrontier
Wed 5/2210:21 pmSTL - ONT
1 stop12h 19mFrontier
Deal found 5/14$142
Thu 6/1310:29 pmONT - STL
1 stop11h 25mFrontier
Fri 6/145:36 pmSTL - ONT
1 stop5h 47mFrontier
Deal found 5/15$143
Wed 8/1412:49 amONT - STL
1 stop12h 04mFrontier
Sun 8/183:53 pmSTL - ONT
1 stop9h 46mFrontier
Deal found 5/15$145
Tue 6/1112:59 amONT - STL
1 stop6h 30mFrontier
Fri 6/145:36 pmSTL - ONT
1 stop5h 47mFrontier
Deal found 5/15$147

Cheap Delta flights from Ontario to St. Louis

Explore cheap flight options specifically provided by Delta 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 2,637,452 searches. Data last updated May 16, 2024.
Browse through some of the cheapest Delta flights traveling from Ontario to St. Louis. Deals frequently update to provide users with more options.
Tue 8/65:00 pmONT - STL
1 stop5h 36mDelta
Fri 8/96:59 pmSTL - ONT
1 stop6h 45mDelta
Deal found 5/15$415
Sat 6/11:20 pmONT - STL
1 stop6h 04mDelta
Wed 6/57:55 amSTL - ONT
1 stop6h 18mDelta
Deal found 5/14$467
Sun 6/165:35 amONT - STL
1 stop5h 59mDelta
Mon 6/176:25 pmSTL - ONT
1 stop7h 17mDelta
Deal found 5/15$506
Tue 6/115:35 amONT - STL
1 stop5h 59mDelta
Tue 6/116:25 pmSTL - ONT
1 stop7h 17mDelta
Deal found 5/15$511
Thu 5/235:45 amONT - STL
1 stop5h 47mDelta
Thu 5/307:55 amSTL - ONT
1 stop6h 18mDelta
Deal found 5/16$653

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

Find cheap flight options from Ontario to St. Louis specifically for the months of May and June 2024. Explore affordable fares based on user searches. Over the last 7 days, Cheapflights users made 2,637,452 searches. Prices were last updated on May 16, 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 5/316:01 pmONT - STL
1 stop14h 12mFrontier
Mon 6/38:04 pmSTL - ONT
1 stop5h 55mFrontier
Deal found 5/15$127
Tue 5/2112:59 amONT - STL
1 stop6h 37mFrontier
Tue 5/282:12 pmSTL - ONT
1 stop27h 53mFrontier
Deal found 5/14$137
Sun 5/1911:30 pmONT - STL
1 stop8h 43mFrontier
Thu 5/3011:06 pmSTL - ONT
1 stop26h 53mFrontier
Deal found 5/16$139
Sat 6/110:10 pmONT - STL
1 stop10h 03mFrontier
Thu 6/63:32 pmSTL - ONT
1 stop10h 12mFrontier
Deal found 5/16$140
Wed 5/1511:09 pmONT - STL
1 stop9h 04mFrontier
Wed 5/2210:21 pmSTL - ONT
1 stop12h 19mFrontier
Deal found 5/15$141
Sun 5/196:09 pmONT - STL
1 stop14h 04mFrontier
Wed 5/2210:21 pmSTL - ONT
1 stop12h 19mFrontier
Deal found 5/14$142
Thu 6/1310:29 pmONT - STL
1 stop11h 25mFrontier
Fri 6/145:36 pmSTL - ONT
1 stop5h 47mFrontier
Deal found 5/15$143
Tue 6/1112:59 amONT - STL
1 stop6h 30mFrontier
Fri 6/145:36 pmSTL - ONT
1 stop5h 47mFrontier
Deal found 5/15$147
Fri 6/712:48 amONT - STL
1 stop6h 41mFrontier
Fri 6/145:36 pmSTL - ONT
1 stop5h 47mFrontier
Deal found 5/15$148

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 2,637,452 searches. Data last updated May 16, 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 5/316:01 pmONT - STL
1 stop14h 12mFrontier
Mon 6/38:04 pmSTL - ONT
1 stop5h 55mFrontier
Deal found 5/15$127
Tue 5/2112:59 amONT - STL
1 stop6h 37mFrontier
Tue 5/282:12 pmSTL - ONT
1 stop27h 53mFrontier
Deal found 5/14$137
Sun 5/1911:30 pmONT - STL
1 stop8h 43mFrontier
Thu 5/3011:06 pmSTL - ONT
1 stop26h 53mFrontier
Deal found 5/16$139
Sat 6/110:10 pmONT - STL
1 stop10h 03mFrontier
Thu 6/63:32 pmSTL - ONT
1 stop10h 12mFrontier
Deal found 5/16$140
Wed 5/1511:09 pmONT - STL
1 stop9h 04mFrontier
Wed 5/2210:21 pmSTL - ONT
1 stop12h 19mFrontier
Deal found 5/15$141
Sun 5/196:09 pmONT - STL
1 stop14h 04mFrontier
Wed 5/2210:21 pmSTL - ONT
1 stop12h 19mFrontier
Deal found 5/14$142
Thu 6/1310:29 pmONT - STL
1 stop11h 25mFrontier
Fri 6/145:36 pmSTL - ONT
1 stop5h 47mFrontier
Deal found 5/15$143
Wed 8/1412:49 amONT - STL
1 stop12h 04mFrontier
Sun 8/183:53 pmSTL - ONT
1 stop9h 46mFrontier
Deal found 5/15$145
Thu 8/1512:49 amONT - STL
1 stop6h 48mFrontier
Sun 8/183:53 pmSTL - ONT
1 stop9h 46mFrontier
Deal found 5/15$146

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 2,637,452 searches. Data last updated May 16, 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.
Tue 5/2112:59 amONT - STL
1 stop6h 37mFrontier
Tue 5/282:12 pmSTL - ONT
1 stop27h 53mFrontier
Deal found 5/14$137
Tue 5/218:29 pmONT - STL
1 stop11h 44mFrontier
Tue 6/113:47 pmSTL - ONT
1 stop10h 12mFrontier
Deal found 5/16$139
Thu 5/2311:07 pmONT - STL
1 stop9h 06mFrontier
Tue 5/282:12 pmSTL - ONT
1 stop20h 52mFrontier
Deal found 5/15$159
Sun 5/2612:59 amONT - STL
1 stop6h 37mFrontier
Wed 5/2910:21 pmSTL - ONT
1 stop12h 19mFrontier
Deal found 5/16$239
Sat 5/2510:10 pmONT - STL
1 stop10h 03mFrontier
Mon 5/278:04 pmSTL - ONT
1 stop5h 55mFrontier
Deal found 5/14$242
Sat 5/2510:10 pmONT - STL
1 stop10h 03mFrontier
Mon 5/278:04 pmSTL - ONT
1 stop19h 20mFrontier
Deal found 5/15$243
Thu 5/2311:07 pmONT - STL
1 stop9h 06mFrontier
Tue 5/282:12 pmSTL - ONT
1 stop20h 52mFrontier
Deal found 5/16$249
Sat 5/255:41 pmONT - STL
1 stop14h 32mFrontier
Mon 5/278:04 pmSTL - ONT
2 stops19h 20mFrontier
Deal found 5/14$266
Fri 5/2411:04 pmONT - STL
1 stop9h 09mFrontier
Mon 5/278:04 pmSTL - ONT
1 stop5h 55mFrontier
Deal found 5/15$273

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 2,637,452 searches. Data last updated May 16, 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.
Tue 6/412:59 amONT - STL
1 stop6h 30mFrontier
Deal found 5/15$70
Tue 5/2110:42 pmONT - STL
1 stop9h 31mFrontier
Deal found 5/15$76
Tue 6/1112:59 amONT - STL
1 stop6h 30mFrontier
Deal found 5/15$85
Mon 5/2012:59 amONT - STL
1 stop10h 10mFrontier
Deal found 5/15$88
Sat 5/2512:59 amONT - STL
1 stop19h 33mFrontier
Deal found 5/16$89
Wed 6/1212:49 amONT - STL
1 stop11h 43mFrontier
Deal found 5/16$91
Thu 6/1312:59 amONT - STL
1 stop6h 41mFrontier
Deal found 5/15$93
Fri 6/1410:23 pmONT - STL
1 stop9h 06mFrontier
Deal found 5/16$95
Fri 6/1410:23 pmONT - STL
1 stop9h 06mFrontier
Deal found 5/15$99

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 2,637,452 searches. Data last updated May 16, 2024.

Fly from

Any airport

Fly to

Any airport

Budget

$127 - $439

Route

Depart

Return

Price

OntarioLambert-St Louis

ONT - STL

ONTSTL

Ontario

Fri 5/31

1 stop14h 12m

Lambert-St Louis

Mon 6/3

1 stop5h 55m

$127

OntarioLambert-St Louis

ONT - STL

ONTSTL

Ontario

Tue 5/21

1 stop6h 37m

Lambert-St Louis

Tue 5/28

1 stop27h 53m

$137

OntarioLambert-St Louis

ONT - STL

ONTSTL

Ontario

Sun 5/19

1 stop8h 43m

Lambert-St Louis

Thu 5/30

1 stop26h 53m

$139

OntarioLambert-St Louis

ONT - STL

ONTSTL

Ontario

Sat 6/1

1 stop10h 03m

Lambert-St Louis

Thu 6/6

1 stop10h 12m

$140

OntarioLambert-St Louis

ONT - STL

ONTSTL

Ontario

Fri 5/31

1 stop19h 46m

Lambert-St Louis

Sun 6/2

1 stop26h 37m

$141

OntarioLambert-St Louis

ONT - STL

ONTSTL

Ontario

Sun 5/19

1 stop14h 04m

Lambert-St Louis

Wed 5/22

1 stop12h 19m

$142

OntarioLambert-St Louis

ONT - STL

ONTSTL

Ontario

Fri 7/5

2 stops11h 34m

Lambert-St Louis

Mon 7/8

1 stop5h 39m

$413

OntarioLambert-St Louis

ONT - STL

ONTSTL

Ontario

Tue 8/6

1 stop5h 36m

Lambert-St Louis

Fri 8/9

1 stop6h 45m

$415

OntarioLambert-St Louis

ONT - STL

ONTSTL

Ontario

Wed 7/3

1 stop7h 48m

Lambert-St Louis

Sat 7/6

2 stops10h 03m

$439

Flights are sorted by cheapest first

Deals found on 5/15

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 May 10, 2024.
The best time to book flights from Ontario to St. Louis is 36 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 May 12, 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. Tuesday at noon 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 $87 while a round-trip flight costs $233. Price data was last updated on May 12, 2024.

Currently, September is the cheapest month in which you can book a flight from Ontario to St. Louis (average of $320). Flying from Ontario to St. Louis in July is currently the most expensive (average of $369). 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

$342

June

$366

July

$369

August

$336

September

$320

October

$324

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 May 16, 2024.
Read through reviews of airlines operating flights from Ontario to St. Louis, such as Frontier, Delta and American 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.
Southwest
8.2
Very good
6,040 reviews
Check prices

Boarding

8.3

Food

7.3

Crew

8.7

Comfort

8.1

Entertainment

7.8

Overall

8.2

Reviews

1 / 10

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

Southwest
8.2
Very good
6,040 reviews
Southwest
8.2
Very good
6,040 reviews
Check prices

Boarding

8.3

Food

7.3

Crew

8.7

Comfort

8.1

Entertainment

7.8

Overall

8.2

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
8.1
Very good
9,157 reviews
Southwest
8.2
Very good
6,040 reviews
Check prices

Boarding

8.3

Food

7.3

Crew

8.7

Comfort

8.1

Entertainment

7.8

Overall

8.2

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
10,673 reviews
Southwest
8.2
Very good
6,040 reviews
Check prices

Boarding

8.3

Food

7.3

Crew

8.7

Comfort

8.1

Entertainment

7.8

Overall

8.2

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
10,924 reviews
Southwest
8.2
Very good
6,040 reviews
Check prices

Boarding

8.3

Food

7.3

Crew

8.7

Comfort

8.1

Entertainment

7.8

Overall

8.2

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
7.3
Good
14,514 reviews
Southwest
8.2
Very good
6,040 reviews
Check prices

Boarding

8.3

Food

7.3

Crew

8.7

Comfort

8.1

Entertainment

7.8

Overall

8.2

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

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 $200 on Cheapflights?

    Yes, there are multiple flights from Ontario to St. Louis for under $200. The cheapest flight booked recently is on Frontier for just $127, but on average you can expect to pay $147.

  • 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 $127. Frontier is priced at 63% 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 ($70), Alaska Airlines ($227), and United Airlines ($262).

  • 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 5/16.

See more FAQs

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.

Los Angeles to Kansas City flights
Los Angeles to St. Louis flights
Ontario to Kansas City flights
San Francisco to Kansas City flights
San Francisco to St. Louis flights
Burbank to Kansas City flights
Santa Ana to Kansas City flights
San Diego to Kansas City flights
Oakland to Kansas City flights
San Francisco to Springfield flights
Santa Ana to St. Louis flights
Las Vegas to St. Louis flights
Oakland to St. Louis flights
Sacramento to St. Louis flights
Sacramento to Springfield flights
Las Vegas to Kansas City flights
San Diego to St. Louis flights
Sacramento to Kansas City flights
San Diego to Springfield flights
Los Angeles to Springfield flights
San Jose to Springfield flights
San Jose to Kansas City flights
San Jose to St. Louis flights
Ontario to Springfield flights
Long Beach to Kansas City flights
Burbank to St. Louis flights
Reno to St. Louis flights
Oakland to Springfield flights
Fresno to St. Louis flights
Fresno to Kansas City flights
Long Beach to St. Louis flights
Reno to Kansas City flights
Santa Barbara to Kansas City flights
Palm Springs to St. Louis flights
Fresno to Springfield flights
Burbank to Springfield flights
Arcata to Branson flights
Monterey to St. Louis flights
Palm Springs to Kansas City flights
Reno to Springfield flights
Santa Ana to Springfield flights
Palm Springs to Springfield flights
Las Vegas to Springfield flights
Medford to St. Louis flights
Santa Rosa to St. Louis flights
Medford to Kansas City flights
Los Angeles to Columbia flights
Ontario to Columbia flights
Santa Barbara to St. Louis flights

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 2,637,452 searches. Data last updated May 16, 2024.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$104Average$200FlexibilityNo cancel feeOn-time62%
Search Frontier flights
DeltaCheapest$276Average$401FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
American AirlinesCheapest$282Average$468FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
United AirlinesCheapest$318Average$439FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Las Vegas to New York flights
Los Angeles to Baltimore flights
Maui to O'ahu flights
Boston to New York flights
Boston to Tampa flights
Los Angeles to Mexico City flights
Hartford to Orlando flights
Nashville to Knoxville flights
USA to New Zealand flights
Los Angeles to New Orleans flights
Ontario to Stockholm flights

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.
First Class
Business Class
Prem Econ Class
Economy Class

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 May 16, 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

Book a flight to one of these trending destinations

User searches for flights to these destinations increased 20% or more in the past 90 days compared to other destinations
Flights to Montes Claros
Flights to Girona Costa Brava
Flights to Naxos
Flights to Bourgas
Flights to Hyannis Barnstable
Flights to Samos
Flights to Reggio Calabria Tito Menniti
Flights to Devils Lake
Flights to Ningbo Lishe Intl
Flights to Pellston Emmet County
Flights to Provincetown
Flights to Cortez Montezuma County
Flights to Ohrid
Flights to Oran Es Senia
Flights to Menorca/Mahon
Flights to Hakodate
Flights to Ordu/Giresun
Flights to Laayoune Hassan I
Flights to Cornwall Newquay
Flights to Melilla
Flights to Rennes St Jacques
Flights to Parikia Paros
Flights to Constanţa Mihail Kogalniceanu
Flights to Miyakojima Hirara

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.

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.

100% Free
Cheapflights is completely free to use, so you can start saving the moment you arrive.
Book with Flexibility
Our users can plan ahead with confidence and find flights with no change fees
Travel Smart
Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.
View all available airlines