Cheap Flights to O'Fallon , MO from CA $42

View CA $42 flight on Thu, Aug. 21, 2025Opens in a new window

Popular airlines to O'Fallon

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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 $42 for one-way flights and CA $83 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Spirit Airlines
Thu, Aug. 21 - Mon, Aug. 25
DTW
Detroit
STL
St. Louis
CA $83 Roundtrip, found 2 days ago
CA $83
Roundtrip
found 2 days ago
Select Spirit Airlines flight, departing Thu, Aug. 21 from Detroit to St. Louis, returning Mon, Aug. 25, priced at CA $83 found 2 days ago
Delta
Thu, Aug. 21 - Mon, Aug. 25
DTW
Detroit
STL
St. Louis
CA $137 Roundtrip, found 3 days ago
CA $137
Roundtrip
found 3 days ago
Select Delta flight, departing Thu, Aug. 21 from Detroit to St. Louis, returning Mon, Aug. 25, priced at CA $137 found 3 days ago
American Airlines
Wed, Sep. 10 - Tue, Sep. 16
DTW
Detroit
STL
St. Louis
CA $232 Roundtrip, found 6 days ago
CA $232
Roundtrip
found 6 days ago
Select American Airlines flight, departing Wed, Sep. 10 from Detroit to St. Louis, returning Tue, Sep. 16, priced at CA $232 found 6 days ago
United
Tue, Sep. 23 - Sat, Sep. 27
DTW
Detroit
STL
St. Louis
CA $353 Roundtrip, found 14 hours ago
CA $353
Roundtrip
found 14 hours ago
Select United flight, departing Tue, Sep. 23 from Detroit to St. Louis, returning Sat, Sep. 27, priced at CA $353 found 14 hours ago
Alaska Airlines
Sat, Sep. 27 - Tue, Sep. 30
YVR
Vancouver
STL
St. Louis
CA $380 Roundtrip, found 2 hours ago
CA $380
Roundtrip
found 2 hours ago
Select Alaska Airlines flight, departing Sat, Sep. 27 from Vancouver to St. Louis, returning Tue, Sep. 30, priced at CA $380 found 2 hours ago

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

August is typically the cheapest month to fly

From CA $198 - CA $984 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?
Book a flight to O'Fallon and you'll be stepping off the plane at Lambert-St. Louis Intl. Airport (STL).
How far is Lambert Field from central O'Fallon?
Lengthy commutes aren't a big deal if you work out your strategy ahead of time. Downtown O'Fallon is 31 kilometres from Lambert Field, so it's smart to know how to get to the city before you touchdown.
What airport is best to fly into O'Fallon?
Lambert-St. Louis Intl. Airport (STL) is the main airport in O'Fallon. Before you step on the plane, it's a wise idea to know a little about it. It sits around 31 kilometres from the downtown area.
How many airlines fly to O'Fallon?
There are 12 air carriers that service O'Fallon from 61 airports around the world.
Which airlines fly to O'Fallon?
United Airlines and American Airlines operate the majority of flights to O'Fallon. One of the most common ways to get there is on a United Airlines flight from Chicago.
How many nonstop flights are there to O'Fallon?
Flying to a new place is much easier when there aren't any stopovers. If you're heading to O'Fallon, the awesome news is that there are roughly 1,206 direct flights 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 very popular.
How long is the flight to O'Fallon Airport?
If it's Chicago you're leaving behind, you'll be in the air for around 1 hour and 22 minutes before you touchdown in O'Fallon. Terminal to terminal from Dallas takes about 1 hour and 43 minutes and from New York, 3 hours and 1 minute.
How to book the cheapest flight to O'Fallon?
If you'd like to save some cash on your trip to O'Fallon, then listen up! As every experienced traveller knows, avoid booking at the last minute. Fares are generally more expensive close to the departure date. Also, do some online research and compare your options. If your destination has multiple airports, you may be able to pick up an excellent price by flying into one a little farther out. Lastly, be prepared to lock in your seat quickly if you stumble on a great price. It might not be available for too long! With a bit of knowledge and some good fortune, the perfect fare can be yours.
Do you have any tips for my flight to O'Fallon?
If you're not prepared, airports and flying can be testing. But there's no need to panic. Follow these handy hints for a comfortable start to your vacation in O'Fallon. What to pack in your hand luggage:

  • The secret to having a pain-free flight experience is to pack in advance. So, let's start with the essentials: passport, travel documents, bank cards and medications. Next, bring on board items that'll help keep you busy, like your laptop or a magazine. You'll also want to pack your chargers, a comfy neck pillow and a pair of earphones. Finally, be sure to pop in toiletries like a toothbrush, deodorant and a clean T-shirt.

Do not pack the following items in your hand luggage:

  • Make sure you don't have a sharp object hiding in one of the compartments of your hand luggage. Other banned items include flammable or explosive 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 go for comfort over style. Prepare for temperature changes in the cabin by layering up, and opt for flat, easy-to-remove footwear like slip-ons.
  • Caused by sustained periods of inactivity, deep vein thrombosis (DVT) is a blood clot condition that can affect some passengers on long-haul flights. Lower your risks by drinking water, keeping your ankles and legs moving and wearing compression socks or tights.

How to get through airport security fast when flying to O'Fallon?
It's easy — be prepared. We've rounded up some helpful hints for a stress-free trip through airport security. Watch out O'Fallon, here you come:

  • Have your ID and travel documents easily accessible. They're the first items you'll be asked to show at security.
  • Time to strip down. Well kind of. Your coat, belt, keys and other contents of your pockets, like your earphones, will need to go through the X-ray machine. Make your life easier by removing them before your turn.
  • All your electronics, including your tablet and phone, will also need to be scanned.
  • Can't travel without your favourite cologne? No problem. As long as the volume is no greater than 3.4 ounces (100 millilitres) and it's stored in a clear zip-lock bag, it's OK to bring with you in your carry-on baggage.
  • It's also likely that you'll need to take your shoes off for scanning, so wearing slip-on sneakers is always a clever idea.
  • Avoid taking prohibited items in your carry-on bag. If you have any sharp or pointed objects, put them in your checked luggage. They won't be allowed on board and will be confiscated.

Flights to O'Fallon information
Destination airport
Lambert-St. Louis Intl.
Destination airport IATA code
STL
Destination city name
St. Louis
Roundtrip price
CA $83

Trending flights to O'Fallon

Prices were available within the past 7 days and start at CA $42 for one-way flights and CA $83 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

American Airlines
Sat, Sep. 13 - Sat, Sep. 13
YVR
Vancouver
STL
St. Louis
CA $372 Roundtrip, found 2 days ago
CA $372
Roundtrip
found 2 days ago
Select American Airlines flight, departing Sat, Sep. 13 from Vancouver to St. Louis, returning Sat, Sep. 13, priced at CA $372 found 2 days ago
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