Cheap Flights to O'Fallon , IL from CA $134

View CA $134 flight on Thu, Oct. 30, 2025Opens in a new window

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How much is the cheapest flight to O'Fallon?

Prices were available within the past 7 days and start at CA $134 for one-way flights and CA $251 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

American Airlines
Wed, Oct. 29 - Sat, Nov. 8
DTW
Detroit
STL
St. Louis
CA $251 Roundtrip, found 12 hours ago
CA $251
Roundtrip
found 12 hours ago
Select American Airlines flight, departing Wed, Oct. 29 from Detroit to St. Louis, returning Sat, Nov. 8, priced at CA $251 found 12 hours ago
Delta
Wed, Oct. 29 - Sat, Nov. 8
DTW
Detroit
STL
St. Louis
CA $278 Roundtrip, found 12 hours ago
CA $278
Roundtrip
found 12 hours ago
Select Delta flight, departing Wed, Oct. 29 from Detroit to St. Louis, returning Sat, Nov. 8, priced at CA $278 found 12 hours ago
United
Tue, Sep. 30 - Wed, Oct. 1
DTW
Detroit
STL
St. Louis
CA $386 Roundtrip, found 2 days ago
CA $386
Roundtrip
found 2 days ago
Select United flight, departing Tue, Sep. 30 from Detroit to St. Louis, returning Wed, Oct. 1, priced at CA $386 found 2 days ago
Air Canada
Sat, Oct. 4 - Sun, Oct. 5
YYC
Calgary
STL
St. Louis
CA $497 Roundtrip, found 12 hours ago
CA $497
Roundtrip
found 12 hours ago
Select Air Canada flight, departing Sat, Oct. 4 from Calgary to St. Louis, returning Sun, Oct. 5, priced at CA $497 found 12 hours ago
Alaska Airlines
Tue, Oct. 7 - Wed, Oct. 8
YVR
Vancouver
STL
St. Louis
CA $497 Roundtrip, found 1 day ago
CA $497
Roundtrip
found 1 day ago
Select Alaska Airlines flight, departing Tue, Oct. 7 from Vancouver to St. Louis, returning Wed, Oct. 8, priced at CA $497 found 1 day ago

Find the cheapest month to fly from Columbus (CMH) to St. Louis (STL)

August is typically the cheapest month to fly

From CA $199 - CA $734 per traveller.

Graph displaying average flight prices per month

Expedia.ca gives you the best tools to secure great deals on flights to O'Fallon. Use our easy and convenient booking engine to browse nonstop flights and convenient departure points every day of the year. Search airfares from the top airlines to book your perfect flight to O'Fallon. Whatever your travel needs, you can always rely on Expedia.ca to help you find cheap flights to O'Fallon.

Using our booking engine is simple - just type in your points of travel and preferred dates and Expedia.ca does the rest! If your travel times are flexible, you can find even better bargains by adjusting your flight dates. Browse connecting flights to increase your chances of finding even lower fares. Thanks to Expedia's Best Price Guarantee, you can book your O'Fallon flights with full confidence knowing that you've found the best deal online.

Expedia.ca makes the booking process easy and stress-free by offering support along the entire way. Our friendly staff is available 24 hours a day to provide assistance and help you book your ticket. Call us toll-free at 1-888-397-3342 to answer any questions that you may have about your trip to O'Fallon.

Looking to save even more? Get additional savings by bundling your O'Fallon flight with a hotel and/or car rental to create a bargain travel package. Early birds can discover terrific savings by booking in advance while last minute travelers can enjoy great last minute deals. With Expedia.ca, there's no shortage of options to save even more on your O'Fallon trip!

Frequently asked questions

What is the name of O'Fallon's airport?
Lambert-St. Louis Intl. Airport (STL) is the major airport that serves O'Fallon.
How far is Lambert-St. Louis Intl. Airport (STL) from central O'Fallon?
STL is 40 kilometres from downtown O'Fallon, so prepare yourself for a bit of a commute into the centre of the city.
What airport is best to fly into O'Fallon?
Sitting 40 kilometres from the downtown area, STL is likely to be your first stop in O'Fallon.
How many airlines fly to O'Fallon?
There are 12 airlines connecting O'Fallon with 61 airports across the world.
Which airlines fly to O'Fallon?
United Airlines and American Airlines offer the majority of flights to O'Fallon. One of the most common ways to travel there is on a United Airlines flight from Chicago.
How many nonstop flights are there to O'Fallon?
Flying to somewhere new is much more straightforward when there aren't any stopovers to worry about. If you're off to O'Fallon, the awesome news is that there are approximately 1,206 nonstop flights operating every week.
Where are the most popular flights to O'Fallon departing from?
Flights to O'Fallon from Chicago, Dallas and New York airports are the most in demand.
How long is the flight to O'Fallon Airport?
Which city you depart from determines how long you'll be strapped into your seat. From Chicago to O'Fallon, the average flight time is 1 hour and 22 minutes. From Dallas it usually takes 1 hour and 43 minutes, and from New York it's 3 hours and 1 minute.
How to book the cheapest flight to O'Fallon?
If you want to have some extra spending money on your O'Fallon vacation, then listen up! As any seasoned traveller knows, don't leave booking until the last minute. Prices are usually more expensive close to the departure date. Don't stop there, however. Do some research and see if there are multiple airports at your destination. Fares often differ depending on the airport you jet into. Remember to compare fares across air carriers too. Last of all, another easy way to save some cash is be ready to book fast. If you stumble on an amazing deal, don't hold off — snap it up while the opportunity's there.
Do you have any tips for my flight to O'Fallon?
We've pulled together all the info you need to make your journey as stress-free as possible. Follow our top tips and you'll be breezing through airport security and enjoying O'Fallon before you know it. What to pack in your hand luggage:

  • First things first, put in your passport, important documents, credit cards and daily medications. Next, you'll need some extra in-flight entertainment to while away the time. A thrilling book and a phone crammed with your favourite movies are some great options. If you plan to catch forty winks, a quality neck pillow and a pair of earplugs will also come in handy. Finally, make room for a few toiletry items so you'll arrive at your destination looking and feeling fresh.

Do not pack the following items in your hand luggage:

  • Check carefully that you don't have a pocket knife lurking in the bottom of your carry-on luggage. Other restricted items include explosive or flammable goods, such as aerosol cans and fuel, and liquids and gels in containers with a volume of more than 3.4 ounces (100 millilitres).

What to wear on a flight:

  • You'll want to choose comfort over style. Prepare for temperature changes by donning layers, and opt for closed-toe, flat shoes like slip-ons.
  • Deep vein thrombosis (DVT) is a risk on long-haul flights. It's the result of blood clotting due to inactivity and poor circulation, so do some gentle leg and foot exercises in your seat and consider wearing compression socks.

How to get through airport security fast when flying to O'Fallon?
The answer is simple — be prepared. We've put together some top tips for a hassle-free trip through security. Watch out O'Fallon, here you come:

  • Keep your ID and travel documents within easy reach. They'll be the first things you'll be asked to present to security.
  • Time to strip down. Well sort of. Your coat, belt, keys and other small items, like your headphones, will need to go through the X-ray machine. Make the whole process easier by removing them as it gets closer to your turn.
  • Your electronic devices like laptops and phones will also have to go on a tray to be scanned. No need to worry though, you'll be back online soon enough.
  • Any gels or liquids, such as hair oil or hand cream, that you want to take on board must be no larger than 3.4 ounces (100 millilitres). Also, everything must fit inside a quart-size (one litre), clear zip-lock bag.
  • There's a possibility that you'll be asked to remove your shoes for scanning, so wearing slip-on sneakers is always a clever idea.
  • Pocket knives and other sharp items are not allowed in the cabin. They'll be seized at security, so pack them in your checked bags.

Flights to O'Fallon information
Destination airport
Lambert-St. Louis Intl.
Destination airport IATA code
STL
Destination city name
St. Louis
Roundtrip price
CA $251

Trending flights to O'Fallon

Prices were available within the past 7 days and start at CA $134 for one-way flights and CA $251 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

American Airlines
Thu, Oct. 30 - Mon, Nov. 3
YYC
Calgary
STL
St. Louis
CA $358 Roundtrip, found 18 hours ago
CA $358
Roundtrip
found 18 hours ago
Select American Airlines flight, departing Thu, Oct. 30 from Calgary to St. Louis, returning Mon, Nov. 3, priced at CA $358 found 18 hours ago
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