Cheap flights from St. Louis to Chicago 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 St. Louis to Chicago departing on 8/5. 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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American Airlines flights from St. Louis to Chicago
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United Airlines flights from St. Louis to Chicago
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How to get the cheapest flight ticket from St. Louis to Chicago
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 Chicago?
The month of August is, on average, the cheapest month to fly to Chicago from St. Louis, with most prices found around $185. If you’re not able to fly to Chicago in August, then September is your next best option. Flight prices from St. Louis to Chicago during September average around $198.
What is the cheapest day to depart on your flight to Chicago?
The cheapest day to depart on your flight to Chicago is on a Thursday when prices can be found for as low as $732. This is often the case because there is less demand to fly during this day of the week. When flying out on a Monday, the most expensive travel day of the week, you can expect to see flight prices from St. Louis to Chicago for around $970.
What is the cheapest time of day to depart on your flight to Chicago?
Our most recent data shows that the best time of day to fly to Chicago is in the morning. Flights from St. Louis to Chicago during this time can be as low as $624. In contrast, the most expensive time of day to depart to Chicago is at noon when prices are around $1,242.
What is the cheapest Lambert-St Louis to Chicago flight route?
Fly from Lambert-St Louis to Chicago Midway for the best Lambert-St Louis - Chicago flight prices
How far in advance should I book a flight to Chicago?
You are more likely to see cheaper flights to Chicago from St. Louis when booking 9 weeks ahead of your departure date. In general, you can expect to find flights to Chicago for around $267 when searching 9 weeks out.However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Chicago from St. Louis for as low as $198 on momondo.
What cabin class options are available on Lambert-St Louis to Chicago flights?
There are 4 cabin classes available to choose from on Lambert-St Louis to Chicago 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 Lambert-St Louis to Chicago?
Southwest, United Airlines, and American Airlines are the most popular carriers operating from Lambert-St Louis to Chicago
What airlines fly to Chicago?
American Airlines, United Airlines and Southwest are the top three most popular airlines that fly to Chicago from St. Louis according to our data. American Airlines is the first choice among our users, with 53% of people opting to fly with this airline when traveling to Chicago. Keep in mind that there are 5 different airlines that fly to Chicago on a routine basis, so you have a few additional options to choose from.
How many flights depart from St. Louis to Chicago on average per day?
As of June 2025, there are 63 flights per day flying from St. Louis to Chicago. The most common time of day flights depart is 8:00AM, with 50% of flights taking off at noon.
How many flights depart from St. Louis to Chicago on average per week?
442 flights are operational weekly from St. Louis to Chicago as of June 2025. The most popular departure day for this route is Thu, with 18% of flights per week taking off on this day.
When to book flights from St. Louis to Chicago
Cheap St. Louis to Chicago (STL to CHI) flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from St. Louis to Chicago
Is flying the fastest way to get from St. Louis to Chicago?
The quickest way is to book a flight from St. Louis to Chicago, which can be as quick as 1h 05m onboard Southwest. You can also get a train from St. Louis to Chicago, or a bus from St. Louis to Chicago which can take you longer to arrive at your destination.
Is flying the cheapest way to get from St. Louis to Chicago?
Taking a train to your destination is the cheapest option we’ve found in the past few days. The cheapest price we’ve found for this option is $54, making it less expensive than a flight from St. Louis to Chicago and cheaper than a bus from St. Louis to Chicago.
How far is Lambert-St Louis to Chicago by plane?
Lambert-St Louis and Chicago are 262.0 mi apart from one another. Flights usually cover this in 1h 05m, depending on flying conditions and air traffic around both airports.
When did momondo last update prices for flights from Lambert-St Louis Airport to Chicago?
Prices for flights from Lambert-St Louis Airport to Chicago are refreshed on a daily basis.
How many operators does momondo search for flights from Lambert-St Louis Airport to Chicago?
As of June 2025, there are 4 operators available to choose from for flights from Lambert-St Louis Airport to Chicago.
How old do you have to be to fly from Lambert-St Louis Airport to Chicago?
The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Lambert-St Louis Airport to Chicago.
What documentation or ID do you need to fly to Chicago?
The travel and health documents required for your trip to Chicago 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 Chicago. 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 St. Louis to Chicago?
Based on momondo bookings for flights between St. Louis and Chicago, the leading plane model is Airbus A319, making up 11.66% of the total bookings. Other popular models include Boeing 737 MAX 8 with 11.32%, Embraer 175 with 8.89%, and Boeing 737-700 Passenger/BBJ1 (winglets) with 8.67%.
What is the most popular airline from St. Louis to Chicago?
momondo data reveals that the most frequently booked airline on the route from St. Louis to Chicago is American Airlines, representing 33% of all bookings. The subsequent popular airlines are Southwest at 32%, Southern / Mokulele at 19%, and United Airlines at 16%.
Best airlines flying from St. Louis to Chicago
Compare and see reviews for airlines that fly from St. Louis to Chicago with momondo
| Airline | Rating | Free Cancellation | Price | ||
|---|---|---|---|---|---|
| PriceFrom $115 | Free Cancellation | Rating 7.2 10,000 reviews | |||
| PriceFrom $118 | Free Cancellation | Rating 6.5 27 reviews | |||
| PriceFrom $126 | Free Cancellation | Rating 7.4 8,790 reviews | |||
| PriceFrom $168 | Free Cancellation | Rating 8.0 4,287 reviews |
Southwest Flights From St. Louis to Chicago
Southwest flight deals from St. Louis to Chicago start from $168 round-trip. Over the 30 Southwest flights for this route in a normal week, average airfare is usually $284 round-trip - but some users have found much cheaper deals with momondo.
United Airlines Flights From St. Louis to Chicago
United Airlines (7.4/10 from 8,790 reviews) operates around 43 flights from St. Louis to Chicago in any given week. The average United Airlines airfare for this route is around $306, with deals from around $126 rare but found on momondo. Referenced prices are for round-trip St. Louis to Chicago flight searches in the last 72 hours.
Traveling to a place near Chicago?
Book flights to Chicago if you plan to visit one of these locationsWhy use momondo?
Why should I use momondo to find a flight deal from St. Louis to Chicago?
To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Chicago from St. Louis.
Can I find flights from St. Louis to Chicago with flexible booking policies on momondo?
All flight searches from St. Louis to Chicago on momondo can be filtered to show those which offer flexible booking policies.
How can momondo help me find flights from St. Louis to Chicago?
Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Chicago from St. Louis.
I’m not ready to book a flight from St. Louis to Chicago right now. Can momondo alert me if prices change?
If you are not ready to book a flight from St. Louis to Chicago now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Chicago and let you know when they change.