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Cheap flights from Ontario to St. Louis from $68

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Cheap Ontario to St. Louis (ONT to STL) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Ontario to St. Louis

Best Price Found

$68

Fastest flight time

4h 52m

Direct flights

None

Airports in St. Louis

1 airport
The best one-way flight to St. Louis from Ontario in the past 72 hours is $68. The best round-trip flight deal from Ontario to St. Louis found on momondo in the last 72 hours is $134.
The fastest flight from Ontario to St. Louis takes 4h 52m
There are no direct flights from Ontario to St. Louis. Popular non-direct route for this connection is Ontario Airport - Lambert-St Louis Airport.
There is 1 airport near St. Louis: Lambert-St Louis (STL)

How to get the cheapest flight ticket from Ontario to St. Louis

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

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

November. The cheapest time of year to fly to St. Louis from Ontario is November. Most expensive is June

What is the cheapest day to depart Ontario for St. Louis?

Saturday. The cheapest day of the week is typically Saturday. The most expensive is typically Monday

When is the cheapest time to fly from Ontario to St. Louis?

In the morning. Ontario to St. Louis flights are approximately 13% more expensive at noon than in the morning

What is the cheapest airline that flies to St. Louis from Ontario?

Frontier. American Airlines, Delta, and Frontier are the most popular carriers operating from Ontario to St. Louis

What is the cheapest Ontario to St. Louis flight route?

Ontario - Lambert-St Louis. Fly from Ontario to Lambert-St Louis for the best Ontario - St. Louis flight prices

How far in advance should you book Ontario to St. Louis flights?

60 days before. The cheapest time to buy a flight from Ontario to St. Louis is approximately 60 days to departure

If you are looking to fly from Ontario to St. Louis, you are most likely going to fly from Ontario Airport to Lambert-St Louis Airport, the most popular airports on that route. You may be looking for an airport near Ontario Airport to depart from when traveling to St. Louis and luckily, there are options! You can try Los Angeles Airport which is located in Los Angeles, Santa Ana J. Wayne/Orange Cnty Airport which is located in Santa Ana, or Burbank Bob Hope Airport which is located in Burbank. If you are looking for an alternate airport to fly into near Lambert-St Louis Airport, Springfield Capital Airport is a great option and is located in Springfield. In February, $114 is typically the cheapest round trip price you’ll find from Ontario to St. Louis which you can find when you fly SNA — STL.

Los Angeles Airport (LAX) to Lambert-St Louis Airport (STL)$134
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Ontario Airport (ONT) to Lambert-St Louis Airport (STL)$190
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Santa Ana J. Wayne/Orange Cnty Airport (SNA) to Lambert-St Louis Airport (STL)$114
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Burbank Bob Hope Airport (BUR) to Lambert-St Louis Airport (STL)$160
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Long Beach Municipal Airport (LGB) to Lambert-St Louis Airport (STL)$290
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Los Angeles Airport (LAX) to Springfield Capital Airport (SPI)$380
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Easily compare round-trip flights from Ontario to St. Louis

Below you can see the best fares for your round-trip flight route over the next six months. All fares were found on momondo this week. Browse the quickest and cheapest flights from Ontario to St. Louis by changing tabs
Frontier
Apr 12
ONT12:59 amOntario
6h 48m
1 stop
STL9:47 amLambert-St Louis
Apr 20
STL8:04 pmLambert-St Louis
5h 55m
1 stop
ONT11:59 pmOntario
Frontier
Apr 9
ONT10:08 pmOntario
10h 10m
1 stop
STL10:18 amLambert-St Louis
Apr 17
STL8:04 pmLambert-St Louis
5h 55m
1 stop
ONT11:59 pmOntario
Multiple Airlines
Mar 5
ONT5:50 pmOntario
24h 23m
2 stops
STL8:13 pmLambert-St Louis
Mar 14
STL7:37 pmLambert-St Louis
14h 23m
1 stop
ONT8:00 amOntario
Frontier
Apr 8
ONT12:59 amOntario
18h 15m
1 stop
STL9:14 pmLambert-St Louis
Apr 17
STL8:04 pmLambert-St Louis
5h 55m
1 stop
ONT11:59 pmOntario
American Airlines
May 18
ONT12:53 pmOntario
8h 06m
2 stops
STL10:59 pmLambert-St Louis
May 22
STL5:21 amLambert-St Louis
8h 35m
1 stop
ONT11:56 amOntario
Delta
May 17
ONT5:20 pmOntario
5h 23m
1 stop
STL12:43 amLambert-St Louis
May 20
STL6:50 pmLambert-St Louis
6h 54m
1 stop
ONT11:44 pmOntario

Find the cheapest one-way flights from Ontario to St. Louis

If you're looking for one-way flights from Ontario to St. Louis, view some of our deals below provided by American Airlines, Delta and Frontier
Frontier
Apr 12
ONT12:59 amOntario
6h 48m
1 stop
STL9:47 amLambert-St Louis
Frontier
Apr 18
ONT12:39 pmOntario
7h 43m
1 stop
STL10:22 pmLambert-St Louis
Frontier
Mar 12
ONT12:59 amOntario
7h 13m
1 stop
STL10:12 amLambert-St Louis

Search last-minute flights to St. Louis from Ontario

Find and compare round-trip flight prices for your last-minute flight from Ontario to St. Louis
Frontier
Feb 28
ONT12:43 pmOntario
18h 12m
1 stop
STL8:55 amLambert-St Louis
Mar 1
STL8:14 pmLambert-St Louis
22h 07m
1 stop
ONT4:21 pmOntario
Multiple Airlines
Feb 29
ONT1:57 pmOntario
19h 16m
1 stop
STL11:13 amLambert-St Louis
Mar 19
STL12:00 pmLambert-St Louis
22h 10m
2 stops
ONT8:10 amOntario
Frontier
Feb 29
ONT10:58 pmOntario
10h 15m
1 stop
STL11:13 amLambert-St Louis
Mar 19
STL10:04 pmLambert-St Louis
10h 33m
1 stop
ONT6:37 amOntario
Frontier
Feb 27
ONT8:27 amOntario
10h 44m
1 stop
STL9:11 pmLambert-St Louis
Mar 5
STL10:03 pmLambert-St Louis
11h 04m
1 stop
ONT7:07 amOntario
Frontier
Feb 28
ONT12:43 pmOntario
18h 12m
1 stop
STL8:55 amLambert-St Louis
Mar 4
STL12:13 pmLambert-St Louis
12h 08m
1 stop
ONT10:21 pmOntario
American Airlines
Feb 28
ONT12:59 amOntario
5h 55m
1 stop
STL8:54 amLambert-St Louis
Mar 19
STL7:01 amLambert-St Louis
8h 55m
1 stop
ONT1:56 pmOntario

Best airlines flying from Ontario to St. Louis

Compare and see reviews for airlines that fly from Ontario to St. Louis with momondo
Airline
Rating
Free Cancellation
Price
FrontierPriceFrom $127Free CancellationRating
5.8
1,053 reviews
Search Frontier flights
American AirlinesPriceFrom $282Free CancellationRating
7.1
2,919 reviews
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DeltaPriceFrom $304Free CancellationRating
7.8
1,585 reviews
Search Delta flights
United AirlinesPriceFrom $309Free CancellationRating
7.2
2,740 reviews
Search United Airlines flights

Frontier flights from Ontario to St. Louis

Our best Frontier deals on Ontario to St. Louis flight tickets
Frontier
Apr 12
ONT12:59 amOntario
6h 48m
1 stop
STL9:47 amLambert-St Louis
Apr 20
STL8:04 pmLambert-St Louis
5h 55m
1 stop
ONT11:59 pmOntario
Frontier
Apr 9
ONT10:08 pmOntario
10h 10m
1 stop
STL10:18 amLambert-St Louis
Apr 17
STL8:04 pmLambert-St Louis
5h 55m
1 stop
ONT11:59 pmOntario
Frontier
Apr 8
ONT12:59 amOntario
18h 15m
1 stop
STL9:14 pmLambert-St Louis
Apr 17
STL8:04 pmLambert-St Louis
5h 55m
1 stop
ONT11:59 pmOntario

American Airlines flights from Ontario to St. Louis

Our best American Airlines deals on Ontario to St. Louis flight tickets
American Airlines
May 18
ONT12:53 pmOntario
8h 06m
2 stops
STL10:59 pmLambert-St Louis
May 22
STL5:21 amLambert-St Louis
8h 35m
1 stop
ONT11:56 amOntario
American Airlines
Mar 20
ONT10:19 amOntario
4h 52m
1 stop
STL5:11 pmLambert-St Louis
Mar 27
STL5:12 amLambert-St Louis
8h 42m
2 stops
ONT11:54 amOntario
American Airlines
May 21
ONT12:53 pmOntario
8h 06m
2 stops
STL10:59 pmLambert-St Louis
May 25
STL11:34 amLambert-St Louis
9h 17m
2 stops
ONT6:51 pmOntario

  • How far is Ontario to Lambert-St Louis by plane?

    There are 1552.8 mi between Ontario and Lambert-St Louis. 4h 52m is a normal flight duration for this route.

  • When did momondo last update prices for flights from Ontario Airport to Lambert-St Louis Airport?

    Prices for flights from Ontario Airport to Lambert-St Louis Airport are updated daily.

  • How many operators does momondo search for flights from Ontario Airport to Lambert-St Louis Airport?

  • How old do you have to be to fly from Ontario Airport to Lambert-St Louis Airport?

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Ontario Airport to Lambert-St Louis Airport.

  • What documentation or ID do you need to fly to Lambert-St Louis Airport?

    The necessary travel and health documents for your Lambert-St Louis Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.


Alternative routes for Ontario to St. Louis

Compare alternative flights to and from nearby airports and cities to discover the best prices and most convenient flight times
Los Angeles to Kansas City Flights
Fastest flight time3h 08m
Cheapest price$87
Los Angeles to St. Louis Flights
Fastest flight time3h 24m
Cheapest price$134
Ontario to Kansas City Flights
Fastest flight time4h 59m
Cheapest price$198
San Francisco to Kansas City Flights
Fastest flight time3h 34m
Cheapest price$153
San Francisco to St. Louis Flights
Fastest flight time5h 32m
Cheapest price$183
Burbank to Kansas City Flights
Fastest flight time4h 56m
Cheapest price$122
Oakland, California to Kansas City Flights
Fastest flight time5h 00m
Cheapest price$130
Santa Ana to St. Louis Flights
Fastest flight time5h 19m
Cheapest price$114
Santa Ana to Kansas City Flights
Fastest flight time9h 25m
Cheapest price$91
San Diego to Kansas City Flights
Fastest flight time3h 00m
Cheapest price$129
Oakland, California to St. Louis Flights
Fastest flight time5h 21m
Cheapest price$140
Ontario to Springfield Flights
Fastest flight time5h 28m
Cheapest price$395

Similar Ontario to St. Louis flights

Flexible with your destination? Broaden your search and find flights similar to your Ontario to St. Louis route

Why use momondo?

Why should I use momondo to find a flight deal from Ontario to St. Louis?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Ontario to St. Louis. momondo saves you time and could save you money on your trip.

Can I find flights from Ontario to St. Louis with flexible booking policies on momondo?

Yes. momondo allows you to filter the results for Ontario to St. Louis flights to just show those with flexible booking policies.

How can momondo help me find flights from Ontario to St. Louis?

Once all potential Ontario to St. Louis flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

I’m not ready to book a flight from Ontario to St. Louis right now. Can momondo alert me if prices change?

If you are not ready to book a flight from Ontario to St. Louis now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to St. Louis and let you know when they change.


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