Cheap flights from Chicago O'Hare Intl Airport to St. Louis from $49
This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Chicago O'Hare Intl Airport to St. Louis departing on 9/25. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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How to get the cheapest flight ticket from Chicago O'Hare Intl Airport to St. Louis
Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip
What is the cheapest month to fly to St. Louis?
In general, September is the cheapest month to fly from Chicago O'Hare Intl Airport to St. Louis. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $212. The month of March is another great option to travel to St. Louis, with average flight prices from Chicago O'Hare Intl Airport averaging around $244.
What is the cheapest day to depart on your flight to St. Louis?
The cheapest day to depart on your flight to St. Louis is on a Thursday when prices can be found for as low as $302. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Monday because tickets tend to average around $510. These prices are subject to change though, so be sure to set up a Price Alert for flights to St. Louis.
What is the cheapest time of day to depart on your flight to St. Louis?
Flying to St. Louis from Chicago O'Hare Intl Airport in the evening is the least expensive time of day to depart. momondo users have found prices as low as $285 when looking at flights departing in the evening. In the morning is when there is more demand to fly to St. Louis, so prices are often more expensive at around $430 per ticket.
What is the cheapest Chicago O'Hare Intl to Lambert-St Louis flight route?
Fly from Chicago O'Hare Intl to Lambert-St Louis for the best Chicago O'Hare Intl - Lambert-St Louis flight prices
How far in advance should I book a flight to St. Louis?
You are more likely to see cheaper flights to St. Louis from Chicago O'Hare Intl Airport when booking 18 weeks ahead of your departure date. In general, you can expect to find flights to St. Louis for around $270 when searching 18 weeks out.However, flight prices might be lower outside of this timeframe. For example, people recently found flights to St. Louis from Chicago O'Hare Intl Airport for as low as $150 on momondo.
What cabin class options are available on Chicago O'Hare Intl to Lambert-St Louis flights?
There are 4 cabin classes available to choose from on Chicago O'Hare Intl to Lambert-St Louis flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.
What is the cheapest airline that flies from Chicago O'Hare Intl to Lambert-St Louis?
United Airlines, Southwest, and Southern / Mokulele are the most popular carriers operating from Chicago O'Hare Intl to Lambert-St Louis
What airlines fly to St. Louis?
American Airlines, United Airlines and Contour are the top three most popular airlines that fly to St. Louis from Chicago O'Hare Intl Airport according to our data. American Airlines is the first choice among our users, with 46% of people opting to fly with this airline when traveling to St. Louis. Keep in mind that there are 4 different airlines that fly to St. Louis on a routine basis, so you have a few additional options to choose from.
How many flights depart from Chicago O'Hare Intl Airport to St. Louis on average per day?
As of June 2025, 60 flights take off from Chicago O'Hare Intl Airport and land in St. Louis each day. The most common flight departure time for this route is 7:00PM, with 41% of daily flights taking off in the evening.
How many flights depart from Chicago O'Hare Intl Airport to St. Louis on average per week?
423 flights are operational weekly from Chicago O'Hare Intl Airport to St. Louis as of June 2025. The most popular departure day for this route is Thu, with 17% of flights per week taking off on this day.
When to book flights from Chicago O'Hare Intl Airport to St. Louis
Cheap Chicago O'Hare Intl Airport to St. Louis (ORD to STL) flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from Chicago O'Hare Intl Airport to St. Louis
How far is Chicago O'Hare Intl to Lambert-St Louis by plane?
A flight from Chicago O'Hare Intl to Lambert-St Louis will travel around 261.0 mi. By plane, this route typically takes 1h 15m.
When did momondo last update prices for flights from Chicago O'Hare Intl Airport to Lambert-St Louis Airport?
Prices for flights from Chicago O'Hare Intl Airport to Lambert-St Louis Airport are refreshed on a daily basis.
How many operators does momondo search for flights from Chicago O'Hare Intl Airport to Lambert-St Louis Airport?
The number of operators available for flights from Chicago O'Hare Intl Airport to Lambert-St Louis Airport is 3 as of June 2025.
How old do you have to be to fly from Chicago O'Hare Intl Airport to Lambert-St Louis Airport?
The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Chicago O'Hare Intl Airport to Lambert-St Louis Airport.
What documentation or ID do you need to fly to Lambert-St Louis Airport?
The travel and health documents required for your trip to Lambert-St Louis Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Lambert-St Louis Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.
What is the most popular plane model from Chicago O'Hare Intl Airport to St. Louis?
Based on momondo bookings for this flight route, the most popular plane model on flight routes from Chicago O'Hare Intl Airport to St. Louis is Airbus A319 (17.78% of total bookings). The next most popular plane models are Boeing 737-800 (11.89%), Canadair (Bombardier) Regional Jet CRJ-550 (11.89%), and Embraer 175 (11.43%).
What is the most popular airline from Chicago O'Hare Intl Airport to St. Louis?
momondo data reveals that the most frequently booked airline on the route from Chicago O'Hare Intl Airport to St. Louis is American Airlines, representing 50% of all bookings. The subsequent popular airlines are United Airlines at 39% and Southern / Mokulele at 12%.
Best airlines flying from Chicago O'Hare Intl Airport to St. Louis
Compare and see reviews for airlines that fly from Chicago O'Hare Intl Airport to St. Louis with momondo
| Airline | Rating | Free Cancellation | Price | ||
|---|---|---|---|---|---|
| PriceFrom $116 | Free Cancellation | Rating 7.2 10,000 reviews | |||
| PriceFrom $117 | Free Cancellation | Rating 6.5 27 reviews | |||
| PriceFrom $149 | Free Cancellation | Rating 7.4 8,790 reviews |
United Airlines Flights From Chicago O'Hare Intl Airport to St. Louis
The lowest priced United Airlines flight from Chicago O'Hare Intl Airport to St. Louis from the last 72 hours was $149. Generally, United Airlines has 46 flights on this route every week with an average price of $320. United Airlines is rated 7.4/10 by our users.
American Airlines Flights From Chicago O'Hare Intl Airport to St. Louis
American Airlines (7.2/10 from 10,000 reviews) operates around 25 flights from Chicago O'Hare Intl Airport to St. Louis in any given week. The average American Airlines airfare for this route is around $275, with deals from around $116 rare but found on momondo. Referenced prices are for round-trip Chicago O'Hare Intl Airport to St. Louis flight searches in the last 72 hours.
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Why should I use momondo to find a flight deal from Chicago to St. Louis?
Finding the right flight to St. Louis from Chicago is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to St. Louis quick and easy, saving you time and money.
Can I find flights from Chicago to St. Louis with flexible booking policies on momondo?
Yes. All flights to St. Louis from Chicago on momondo can be compared and filtered by various policies on offer, including flexible booking.
How can momondo help me find flights from Chicago to St. Louis?
Once you have performed a search for Chicago to St. Louis flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.
I’m not ready to book a flight from Chicago to St. Louis right now. Can momondo alert me if prices change?
Yes momondo offers price alerts on flights to St. Louis from Chicago. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.