£174 Cheap Flights from Ontario Intl. Airport (ONT) to St. Louis (STL)
Popular airlines from Ontario Intl. Airport (ONT) to Lambert-St. Louis International Airport (STL)
Alaska AirlinesAlaska Airlines
American AirlinesAmerican Airlines
Southwest AirlinesSouthwest Airlines
DeltaDelta
UnitedUnited
Frontier AirlinesFrontier Airlines
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Cheap Flights from Ontario to St. Louis (ONT-STL)
Find the cheapest month to fly from Ontario (ONT) to St. Louis (STL)
October is typically the cheapest month to flyOctober is typically the cheapest month to fly
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Compare flights from Ontario Intl. Airport to St. Louis easily and book with confidence
For travelling on business or for pleasure, Expedia makes it easy to book your flights from Ontario Intl. Airport to St. Louis. Operating between them flights per day, 5 airlines cover the route. And fly direct, getting you to Lambert-St. Louis Intl. in just hours. If you have a preferred carrier, use our advanced search tool to find the right flight from Ontario Intl. Airport to Lambert-St. Louis Intl..
To make things even better, in the advanced search, you can also choose to fly economy, premium economy, business or first class, select your maximum number of stops, and pick your preferred departure and arrival time. You can also opt for refundable and direct flights.
Grab a great deal on your flight from Ontario Intl. Airport (ONT) to Lambert-St. Louis Intl. (STL)
The easiest way to view the best deals on flights from Ontario Intl. Airport to St. Louis today is to enter your travel dates and hit search. From here, you can sort your results by price to see the cheapest flights first. Right now, return flights from Ontario Intl. Airport to Lambert-St. Louis Intl. start at just and range up to .
To find an even better deal, try
- being flexible on your dates – midweek flights can be cheaper
- looking for other airports near Ontario Intl. Airport and St. Louis
- booking your flight during , the cheapest month on this route
- varying your flight times – early morning and late at night are sometimes cheaper
Why you should book your Ontario Intl. Airport to St. Louis flight with Expedia!
We cater for all flight types, cabin classes and airlines. So whether you’re booking flights from Ontario Intl. Airport to Lambert-St. Louis Intl. for a budget break or a business trip with a bit of pleasure thrown in, we make it easy to secure the seat that’s right for you.
Thanks to our supersized inventory that offers great choice all in one place, you know you’ll get a great deal with Expedia. Especially if you bundle your flight together with your hotel, you will unlock amazing savings. For added peace of mind, you can choose flexible bookings or filter to find refundable options, so you won’t pay a fee to change your flight.
Frequently Asked Questions
How much is a flight from Los Angeles - Ontario Intl. Airport (ONT) to STL?
Within the past 7 days on Expedia, for flights departing within the next year, the lowest price advertised for a round-trip journey from ONT to STL was . Fares this good don't wait forever, so make sure you book yours today. Prices and availability are subject to change. Additional terms apply.
Do I need to pay a cancellation fee if I cancel my flight from Los Angeles - Ontario Intl. Airport (ONT) to STL?
This can differ between air carriers, as each has its own terms and conditions. Head to the Customer Service Portal, where you'll find easy instructions on how to cancel online.
How do I find cheap flights from Ontario Airport to STL that have flexible change policies?
Many airlines offer the option to reschedule your flight without a change fee. All you pay is the difference between the original flight and the new flight. When you're searching for Los Angeles - Ontario Intl. Airport (ONT) to STL flights, you'll see a "no change fees" filter for you to select.
How far is the flight from Los Angeles - Ontario Intl. Airport (ONT) to STL?
The flying distance from Ontario Airport to St. Louis Lambert International Airport is 2,500 kilometres. Sneak in a nap or finish off your latest read and the trip will zip by.
Which airlines fly direct from Ontario Airport to St. Louis Lambert International Airport?
If you want to fly straight from Los Angeles - Ontario Intl. Airport (ONT) to Lambert-St. Louis Intl. Airport (STL), you'll have to book a flight with one or more stops. Unfortunately, there are no airlines that fly directly between these airports.
Are Los Angeles - Ontario Intl. Airport (ONT) to Lambert-St. Louis Intl. Airport (STL) flight tickets cheaper when they're purchased at the last minute?
Booking your trip from Ontario Airport to St. Louis Lambert International Airport last minute could save you some serious cash. However, you might miss out on a flight altogether! If you'd prefer not to take any chances, book well ahead of your departure date. In fact, Expedia has some of the biggest bargains as far ahead as 12 months in advance. If your preferred carrier hasn't released tickets yet, check back often as deals are updated all the time on Expedia.
Travel information
Origin airport | Ontario Intl. Airport |
|---|---|
Destination airport | Lambert-St. Louis International Airport |
Distance | 1,541 miles away |
Airlines serving | Alaska Airlines, American Airlines, Southwest Airlines, Delta, United, Frontier Airlines |
Popular airline | Alaska Airlines |
Return price | £174 |