$21 Cheap Flights to O'Fallon , IL

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How much is the cheapest flight to O'Fallon?

Prices were available within the past 7 days and start at $21 for one-way flights and $48 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frontier Airlines
Tue, May 7 - Sat, May 18
CMH
John Glenn Columbus Intl.
STL
Lambert-St. Louis Intl.
$108 Roundtrip, found 1 day ago
$108
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Tue, May 7 from John Glenn Columbus Intl. to Lambert-St. Louis Intl., returning Sat, May 18, priced at $108 found 1 day ago
Frontier Airlines
Tue, May 21 - Sat, Jun 8
CMH
John Glenn Columbus Intl.
STL
Lambert-St. Louis Intl.
$119 Roundtrip, found 1 day ago
$119
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Tue, May 21 from John Glenn Columbus Intl. to Lambert-St. Louis Intl., returning Sat, Jun 8, priced at $119 found 1 day ago
Frontier Airlines
Tue, May 21 - Wed, May 29
CMH
John Glenn Columbus Intl.
STL
Lambert-St. Louis Intl.
$127 Roundtrip, found 10 hours ago
$127
Roundtrip
found 10 hours ago
Select Frontier Airlines flight, departing Tue, May 21 from John Glenn Columbus Intl. to Lambert-St. Louis Intl., returning Wed, May 29, priced at $127 found 10 hours ago
Frontier Airlines
Sun, May 19 - Sat, Jun 8
CMH
John Glenn Columbus Intl.
STL
Lambert-St. Louis Intl.
$129 Roundtrip, found 1 day ago
$129
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Sun, May 19 from John Glenn Columbus Intl. to Lambert-St. Louis Intl., returning Sat, Jun 8, priced at $129 found 1 day ago
American Airlines
Wed, May 15 - Tue, May 21
CMH
John Glenn Columbus Intl.
STL
Lambert-St. Louis Intl.
$193 Roundtrip, found 2 days ago
$193
Roundtrip
found 2 days ago
Select American Airlines flight, departing Wed, May 15 from John Glenn Columbus Intl. to Lambert-St. Louis Intl., returning Tue, May 21, priced at $193 found 2 days ago

Find Your Flights to O'Fallon STL

Cheap flights to O'Fallon (STL)

Get started finding a cheap flight to O'Fallon on Expedia by either choosing a deal on this page or entering into the search bar your travel dates, origin airport, and whether you want roundtrip or one-way airfare. You can filter for flexibility, number of stops, airline, and departure/arrival times to find the best flight for you.

We recommend using the ‘Flexible Dates’ calendar at the top of the page to see the price of plane tickets on the surrounding dates. This allows you to pick the cheapest days to fly if your trip allows flexibility and score cheap flight deals to O'Fallon.

Roundtrip prices range from $48 - $193, and one-ways to O'Fallon start as low as $21.

Be aware that choosing a non-stop flight can sometimes be more expensive while saving you time. And routes with connections may be available at a cheaper rate.

Airlines that fly to O'Fallon (STL)

You have several options for which airline you choose to travel with to O'Fallon. There are 10 airlines flying into STL: Frontier Airlines, American Airlines. 

Cheap plane tickets may be available from different airlines at different times and with unique terms. It’s best to understand the details of each airline’s offer before judging its value.

For example, if you plan to check a bag or bring a carry-on, check whether the cheap airfare deal includes a baggage allowance. If not, verify whether the baggage fee is higher than the difference of other airline plane ticket deals offering free checked/carry-on baggage in exchange for a slightly higher airfare. 

Additionally, your preferred frequent flyer membership programs may influence your choice of cheap airline. Expedia allows you to enter your membership numbers during checkout to earn points from your airline and Expedia Rewards—all while getting a great deal and planning all your travel in one online platform.

Find the best deals

At Expedia, we source many flight deals from multiple providers, so you can easily find the best deals that are right for you. A great strategy for getting the best deals can be to make sure you book and travel at the optimal times. Airfare to O'Fallon (STL) varies throughout the year based on seasonal demand. You’ll see the lowest rates for roundtrips to STL in May and in May for one-ways.

Cancellation & flexibility

To change or cancel eligible flights, go to ‘My Trips’ and navigate to your itinerary. If you booked within the last 24-hours, you might be able to cancel your flight for free. Learn more about flight changes or cancellations from our customer service portal. Some plane tickets are available with no change fees, which you can filter for during your search.

Frequently asked questions

How do I find cheap flights to OFallon that have flexible change policies?
When it comes to flying these days, flexibility is a must. That’s why we’ve added a “No change fee” filter to help you find cheap, flexible fares to OFallon. It’s at the top left of your screen just underneath the “Flexible change policies” heading.
What is the name of the airport in OFallon?
Lambert-St. Louis Intl. Airport (STL) is the major airport in OFallon.
How far is Lambert-St. Louis Intl. Airport (STL) from central OFallon?
The trip between Lambert Field and downtown OFallon is reasonably long. You’ll have to travel 45 mi before you can drop your bags at your hotel in the city.
How can I book the cheapest flight to OFallon?
To boost your chances of finding the cheapest flight, enter your travel details into the search bar, then filter the results by your preferred airlines, departure and arrival times, and number of stops on your route. Also compare the prices of flying into and out of other airports if that’s an option for you. Timing plays a big role in nabbing a bargain — book domestic flights at least four weeks out and international flights around six months in advance to save 10% on average. And if you see a good deal, grab it before it disappears! One of the cheapest fares to OFallon right now is $29, departing Denver in May. Wherever you’re leaving from, Expedia will help get you to OFallon for the cheapest price possible.
Which day of the week is the best day to buy a plane ticket to OFallon?
Sunday is the best day of the week to buy a plane ticket. But that’s not the only way to score an awesome deal. Looking for tickets and being ready to buy several weeks before your date of departure will also pay off. Research shows that the optimal booking window ranges from 21 days to about 45 days out from departure. Decided on your travel dates to OFallon months ahead of time? Check when airlines first release their tickets as often these are the cheapest prices available. Savings are subject to change and may vary depending on selections made.
What airport is best to fly into OFallon?
A flight to OFallon means coming in to land at Lambert-St. Louis Intl. Airport (STL). Get off the plane, collect your bags and you’ll be 45 mi from downtown.
Which airlines fly to OFallon?
You’ll find 9 airlines connecting OFallon with 60 airports across the globe. One of the best is American Airlines, which operates the largest number of flights to OFallon from Chicago. Another good option is United Airlines.
How many nonstop flights are there to OFallon?
With 1,273 nonstop flights operating each week, you’ll be touching down in OFallon before you can say, “Are we there yet?”
Where are the most popular flights to OFallon departing from?
Flights to OFallon departing from Chicago, Denver and Dallas airports are very popular.
Do you have any tips for my flight to OFallon?

  • Wherever you’re coming from, flying can be an enjoyable experience if you’re properly prepared. First of all, pack your passport, travel documents and medications. Next, throw in some in-flight entertainment to while away the hours. The latest bestseller and a tablet filled with your favorite movies are good options. If you plan to take a short nap, a comfy neck pillow and noise-canceling headphones will also come in handy.
  • There’s a lengthy list of items you shouldn’t pack in your carry-on baggage too. Flammables, explosives and sharps are strictly prohibited in the cabin — they can include knives, razor blades, flares and aerosol cans. Some sporting equipment, like baseball bats and martial arts weapons, are also not allowed in your hand luggage. Check your airline’s website for details about what you can and can’t take on board.

What to wear on a flight:

  • Go for comfort rather than fashion when flying. Layer up and wear natural fabrics since they allow moisture and air to pass through and keep you cool. Cabins can get colder on longer flights, so pack a hoodie or similar and always wear sneakers or enclosed shoes.
  • Lessen your risk of developing deep vein thrombosis (DVT), a blood clotting condition which can be caused by sitting for extended periods, by regularly moving around the cabin. You can also do some gentle lower limb exercises in your seat. If you’re at higher risk of developing DVT, consider wearing compression socks.

How can I get a cheap last-minute flight to OFallon?
The key to tracking down a cheap last-minute flight to OFallon is to stay flexible. You can increase your odds of landing an excellent deal if you’re not tied to specific airlines, flight times and travel dates. Also compare the prices of flying into and out of nearby airports if that’s a possibility.
Where can I learn more about changing or canceling my flight to OFallon?
Most flights are free to cancel within 24 hours of making the reservation. However, some flights are non-refundable, and you may receive a flight credit from the airline to use for a future booking. For more information, please visit our Customer Service Portal.
Flights to O'Fallon information
Destination airport
Lambert-St. Louis Intl.
Destination airport IATA code
STL
Destination city name
St. Louis
Airlines serving
Alaska Airlines, American Airlines, Delta, Frontier Airlines, Spirit Airlines, United
Roundtrip price
$108
Popular airline
Delta

Trending flights to O'Fallon

Prices were available within the past 7 days and start at $21 for one-way flights and $48 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frontier Airlines
Tue, May 7 - Tue, May 7
DEN
Denver Intl.
STL
Lambert-St. Louis Intl.
$48 Roundtrip, found 2 days ago
$48
Roundtrip
found 2 days ago
Select Frontier Airlines flight, departing Tue, May 7 from Denver Intl. to Lambert-St. Louis Intl., returning Tue, May 7, priced at $48 found 2 days ago
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