Cheap Flights to O'Fallon , MO from CA $161

View CA $161 flight on Fri, May 1, 2026Opens 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 $161 for one-way flights and CA $298 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Wed, Mar 11 - Sat, Mar 28
DTW
Detroit
STL
St. Louis
CA $298 Roundtrip, found 5 days ago
CA $298
Roundtrip
found 5 days ago
Select United flight, departing Wed, Mar 11 from Detroit to St. Louis, returning Sat, Mar 28, priced at CA $298 found 5 days ago
American Airlines
Fri, May 1 - Mon, May 4
DTW
Detroit
STL
St. Louis
CA $321 Roundtrip, found 10 hours ago
CA $321
Roundtrip
found 10 hours ago
Select American Airlines flight, departing Fri, May 1 from Detroit to St. Louis, returning Mon, May 4, priced at CA $321 found 10 hours ago
Delta
Wed, Feb 25 - Sun, Mar 1
YVR
Vancouver
STL
St. Louis
CA $362 Roundtrip, found 1 day ago
CA $362
Roundtrip
found 1 day ago
Select Delta flight, departing Wed, Feb 25 from Vancouver to St. Louis, returning Sun, Mar 1, priced at CA $362 found 1 day ago
Air Canada
Sat, Jun 6 - Mon, Jun 8
YOW
Ottawa
STL
St. Louis
CA $408 Roundtrip, found 2 hours ago
CA $408
Roundtrip
found 2 hours ago
Select Air Canada flight, departing Sat, Jun 6 from Ottawa to St. Louis, returning Mon, Jun 8, priced at CA $408 found 2 hours ago
Alaska Airlines
Sat, Apr 11 - Tue, Apr 21
YVR
Vancouver
STL
St. Louis
CA $412 Roundtrip, found 1 day ago
CA $412
Roundtrip
found 1 day ago
Select Alaska Airlines flight, departing Sat, Apr 11 from Vancouver to St. Louis, returning Tue, Apr 21, priced at CA $412 found 1 day ago

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

October is typically the cheapest month to fly

From CA $193 - CA $632 per traveller.

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 with Expedia and you'll be stepping off the plane at Lambert-St. Louis Intl. Airport (STL).
How far is Lambert Field from central O'Fallon?
Long commutes don't have to be stressful if you plan ahead for them. Downtown O'Fallon is 31 kilometres from Lambert Field, so it's smart to know how you'll get into the city before you touchdown.
What airport is best to fly into O'Fallon?
Head through the exit of Lambert Field and your O'Fallon getaway will have begun! The city's main airport, it's located 31 kilometres from the downtown area.
How many airlines fly to O'Fallon?
O'Fallon is serviced by 12 air carriers from at least 61 airports around the world.
Which airlines fly to O'Fallon?
United Airlines and American Airlines are some of the leading airlines with flights to O'Fallon. Travellers often use Chicago as a departure point with United Airlines operating the most flights on this route.
How many nonstop flights are there to O'Fallon?
Flying to a new place is much more straightforward when there aren't any stopovers to worry about. If you're jetting off to O'Fallon, the great news is that there are 1,206 direct flights every week.
Where are the most popular flights to O'Fallon departing from?
The most popular flights to O'Fallon leave from Chicago, Dallas and New York airports.
How long is the flight to O'Fallon Airport?
If it's Chicago you're departing, you'll be in the sky for around 1 hour and 22 minutes before you touchdown in O'Fallon. Runway to runway from Dallas generally takes 1 hour and 43 minutes and from New York, the flight time is 3 hours and 1 minute.
How to book the cheapest flight to O'Fallon?
We all know those fortunate travellers who somehow grab extremely cheap airfares wherever they go. Want to know how to do it for your O'Fallon vacation? Don't leave it until the last minute to secure your flight. Don't stop there, however. Do some research and find out if there is more than one airport at your destination. Ticket prices often differ depending on the airport you pick. Be sure to compare prices across airlines as well. Lastly, another simple way to save a few dollars is be ready to book fast. If you find an irresistible deal, don't hold off — snap it up while you can.
Do you have any tips for my flight to O'Fallon?
Wherever you're jetting in from, flying can be a pleasurable experience if you're well prepared. We've compiled a list of handy hints that will help get your O'Fallon escape started on the right foot. What to pack in your hand luggage:

  • The trick to having a great flight experience is to be prepared. Start with the essentials: passport, travel documents, credit cards and any vital medications. Next, bring items that'll help keep you occupied, like some electronic devices or a magazine. You'll also want to bring your chargers, a neck pillow and a pair of earphones. Last but not least, don't forget to squeeze in toiletry items like a toothbrush, lip balm and a spare set of clothes.

Do not pack the following items in your hand luggage:

  • While the list of banned items can differ between airlines, the general rule of thumb is nothing flammable, sharp or explosive. This includes things like tools, metal cutlery, spray paint and fireworks. Sports equipment like ski poles, and items that could injure passengers, such as firearms and swords, won't be allowed on board either.

What to wear on a flight:

  • The aisles of an aircraft are no place for a fashion parade. Dress in comfortable layers and pick shoes that are flat, roomy and easy to pull on and off.
  • Caused by lengthy periods of inactivity, deep vein thrombosis (DVT) is a blood clot condition that can affect passengers on long-distance flights. Lower your risks by drinking water, keeping your legs and feet moving and wearing compression socks to help your circulation.

How to get through airport security fast when flying to O'Fallon?
It's simple — be prepared. We've pulled together some useful tips for a fuss-free trip through airport security. Look out O'Fallon, here you come:

  • First things first. Your boarding pass and passport will need to be presented to security personnel. Keep them within easy reach so you don't hold up the queue.
  • Time to strip down. Well kind of. Your coat, belt, keys and other contents of your pockets, like your headphones, will be required to go through the X-ray machine. Make your life easier by removing them before your turn arrives.
  • Your electronic gadgets like laptops and phones will also need to go on a tray for inspection. Don't worry though, you'll be back online in no time.
  • Any gels or liquids, such as shampoo or hand cream, that you want to take on board must be no greater than 3.4 ounces (100 millilitres). Also, everything must fit inside a quart-size (one litre), clear zip-lock bag.
  • Lightweight sneakers are a clever footwear choice as you're less likely to be asked to remove them when passing through security. Big boots and other heavy-style shoes are usually subjected to extra screening.
  • Pocket knives and other sharp items can't be taken on board. They'll be seized at security, so put them in your checked baggage.

Flights to O'Fallon information
Destination airport
Lambert-St. Louis Intl.
Destination airport IATA code
STL
Destination city name
St. Louis
Roundtrip price
CA $297

Trending flights to O'Fallon

Prices were available within the past 7 days and start at CA $161 for one-way flights and CA $298 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Mon, Apr 20 - Tue, Apr 21
YVR
Vancouver
STL
St. Louis
CA $344 Roundtrip, found 1 day ago
CA $344
Roundtrip
found 1 day ago
Select United flight, departing Mon, Apr 20 from Vancouver to St. Louis, returning Tue, Apr 21, priced at CA $344 found 1 day ago

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