Cheap Flights to O'Fallon: O'Fallon Flight Deals

View €43 flight on Mon, 27 Oct 2025Opens in a new window

Popular airlines to O'Fallon

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Cheap round-trip flights to O'Fallon

Prices were available within the past 7 days and start at €43 for one-way flights and €84 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

American Airlines
Thu, 9 Oct - Mon, 13 Oct
ORD
Chicago
STL
St. Louis
€84 Return, found 4 hours ago
€84
Return
found 4 hours ago
Select American Airlines flight, departing Thu, 9 Oct from Chicago to St. Louis, returning Mon, 13 Oct, priced at €84 found 4 hours ago
United
Sat, 4 Oct - Sun, 5 Oct
ORD
Chicago
STL
St. Louis
€127 Return, found 6 days ago
€127
Return
found 6 days ago
Select United flight, departing Sat, 4 Oct from Chicago to St. Louis, returning Sun, 5 Oct, priced at €127 found 6 days ago
Delta
Sat, 4 Oct - Sun, 5 Oct
ORD
Chicago
STL
St. Louis
€133 Return, found 6 days ago
€133
Return
found 6 days ago
Select Delta flight, departing Sat, 4 Oct from Chicago to St. Louis, returning Sun, 5 Oct, priced at €133 found 6 days ago
Southern Airways Express
Wed, 15 Oct - Fri, 17 Oct
ORD
Chicago
STL
St. Louis
€173 Return, found 2 hours ago
€173
Return
found 2 hours ago
Select Southern Airways Express flight, departing Wed, 15 Oct from Chicago to St. Louis, returning Fri, 17 Oct, priced at €173 found 2 hours ago
British Airways
Fri, 7 Nov - Fri, 14 Nov
BER
Berlin
STL
St. Louis
€492 Return, found 1 day ago
€492
Return
found 1 day ago
Select British Airways flight, departing Fri, 7 Nov from Berlin to St. Louis, returning Fri, 14 Nov, priced at €492 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 €123 - €427 per traveller.

Expedia.ie is an online travel company that specialises in securing the best prices for flights to O'Fallon. With Expedia you get highly specialised services, combining the best of technology, in-depth knowledge and the best connections in order to offer great deals to O'Fallon. Expedia shares your passion for travel and has built the best online travel service that promotes and encourages travel. Whether you are looking for cheap flights to O'Fallon, or are just on the lookout for the best flights to O'Fallon, you are sure to find the best deals with Expedia.ie.

"One of the many benefits of booking your flights through Expedia is that we are one of the world’s largest online travel agency, which means we use our collective experience and work tirelessly to bring you the best prices. With Expedia you get a user-friendly internet experience and a dedicated customer support service that ensures that everything goes smoothly. The goal of Expedia is to offer premium services at the lowest price, all at one single place. If you wish to save even more try combing a hotel in O'Fallon to your flight and create a personalised low cost city break or holiday to your favourite destination. Book early and you could save even more!

If you have an Expedia.ie itinerary number and have a question or concern about your travel plans you can call us on (01) 524 5005 from 8am - 10pm Monday to Friday, and 9am - 10pm at weekends and an Expedia agent will help you.

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 holiday? 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
Return price
€83

Trending flights to O'Fallon

Prices were available within the past 7 days and start at €43 for one-way flights and €84 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

American Airlines
Wed, 5 Nov - Thu, 27 Nov
DUB
Dublin
STL
St. Louis
€761 Return, found 1 day ago
€761
Return
found 1 day ago
Select American Airlines flight, departing Wed, 5 Nov from Dublin to St. Louis, returning Thu, 27 Nov, priced at €761 found 1 day ago
*Available to Expedia members.