Cheap flights from St. Louis to Chicago from $39
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 8/4. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
Discover deals from 900+ travel sites with momondo.
Save money when you book flights with momondo
Big names and deals
Big names and deals
Search 100s of travel sites to compare prices.Filter for what you want
Filter for what you want
Free Wi-Fi? Stopover? Instantly customize your results.Trusted and free
Trusted and free
We’re completely free to use - no hidden charges or fees.Price Alerts
Price Alerts
Not ready to book? to track prices.Find the cheapest flights from St. Louis to Chicago
Cheap round-trip flights
Cheap one-way flights
Cheap last minute flights
Cheap direct flights
United Airlines flights from St. Louis to Chicago O'Hare Intl Airport
Our best United Airlines deals on St. Louis to Chicago O'Hare Intl Airport flight tickets
American Airlines flights from St. Louis to Chicago O'Hare Intl Airport
Our best American Airlines deals on St. Louis to Chicago O'Hare Intl Airport flight tickets
See travel insights to Chicago from
How to get the cheapest flight ticket from St. Louis to Chicago O'Hare Intl Airport
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 O'Hare Intl Airport?
The month of September is another great option to travel to Chicago O'Hare Intl Airport, with average flight prices from St. Louis averaging around $217.
What is the cheapest day to depart on your flight to Chicago O'Hare Intl Airport?
The cheapest day to depart on your flight to Chicago O'Hare Intl Airport is on a Thursday when prices can be found for as low as $824. This is often the case because there is less demand to fly during this day of the week. On the other hand, Monday is the most expensive day to depart from St. Louis because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $1,010.
What is the cheapest time of day to depart on your flight to Chicago O'Hare Intl Airport?
Flying to Chicago O'Hare Intl Airport from St. Louis in the morning is the least expensive time of day to depart. momondo users have found prices as low as $669 when looking at flights departing in the morning. Try not to purchase tickets at noon because they tend to be around $1,269. Of course, these prices can vary depending on the time of year and what airport you fly to.
What is the cheapest Lambert-St Louis to Chicago O'Hare Intl flight route?
Fly from Lambert-St Louis to Chicago O'Hare Intl for the best Lambert-St Louis - Chicago O'Hare Intl flight prices
How far in advance should I book a flight to Chicago O'Hare Intl Airport?
You are more likely to see cheaper flights to Chicago O'Hare Intl Airport from St. Louis when booking 9 weeks ahead of your departure date. In general, you can expect to find flights to Chicago O'Hare Intl Airport for around $268 when searching 9 weeks out.However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Chicago O'Hare Intl Airport from St. Louis for as low as $198 on momondo.
What cabin class options are available on Lambert-St Louis to Chicago O'Hare Intl flights?
There are 4 cabin classes available to choose from on Lambert-St Louis to Chicago O'Hare Intl 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 O'Hare Intl?
United Airlines, American Airlines, and Southwest are the most popular carriers operating from Lambert-St Louis to Chicago O'Hare Intl
What airlines fly to Chicago O'Hare Intl Airport?
American Airlines, United Airlines and Southern / Mokulele are the top three most popular airlines that fly to Chicago O'Hare Intl Airport from St. Louis according to our data. American Airlines is the first choice among our users, with 57% of people opting to fly with this airline when traveling to Chicago O'Hare Intl Airport. Keep in mind that there are 4 different airlines that fly to Chicago O'Hare Intl Airport on a routine basis, so you have a few additional options to choose from.
How many flights depart from St. Louis to Chicago O'Hare Intl Airport on average per day?
As of June 2025, 64 flights take off from St. Louis and land in Chicago O'Hare Intl Airport each day. The most common flight departure time for this route is 1:00PM, with 46% of daily flights taking off at noon.
How many flights depart from St. Louis to Chicago O'Hare Intl Airport on average per week?
The number of flights available between St. Louis and Chicago O'Hare Intl Airport is 449 per week as of June 2025. The most frequent departure day is Mon, with 17% of weekly flights leaving on this day.
When to book flights from St. Louis to Chicago O'Hare Intl Airport
Cheap St. Louis to Chicago O'Hare Intl Airport (STL to ORD) flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from St. Louis to Chicago O'Hare Intl Airport
How far is Lambert-St Louis to Chicago O'Hare Intl by plane?
Lambert-St Louis and Chicago O'Hare Intl are 261.0 mi apart from one another. Typically, this will take 1h 16m by plane in normal conditions.
When did momondo last update prices for flights from Lambert-St Louis Airport to Chicago O'Hare Intl Airport?
Prices for flights from Lambert-St Louis Airport to Chicago O'Hare Intl Airport are refreshed on a daily basis.
How many operators does momondo search for flights from Lambert-St Louis Airport to Chicago O'Hare Intl Airport?
The number of operators available for flights from Lambert-St Louis Airport to Chicago O'Hare Intl Airport is 3 as of June 2025.
How old do you have to be to fly from Lambert-St Louis Airport to Chicago O'Hare Intl Airport?
Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Lambert-St Louis Airport to Chicago O'Hare Intl Airport.
What documentation or ID do you need to fly to Chicago O'Hare Intl Airport?
The travel and health documents you'll need for your trip to Chicago O'Hare Intl Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Chicago O'Hare Intl Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.
What is the most popular plane model from St. Louis to Chicago O'Hare Intl Airport?
Based on momondo bookings for flights between St. Louis and Chicago O'Hare Intl Airport, the leading plane model is Airbus A319, making up 12.46% of the total bookings. Other popular models include Canadair (Bombardier) Regional Jet CRJ-550 with 10.22%, Boeing 737 MAX 8 with 9.94%, and Embraer 175 with 9.55%.
What is the most popular airline from St. Louis to Chicago O'Hare Intl Airport?
momondo data reveals that the most frequently booked airline on the route from St. Louis to Chicago O'Hare Intl Airport is American Airlines, representing 57% of all bookings. The subsequent popular airlines are United Airlines at 32% and Southern / Mokulele at 11%.
Best airlines flying from St. Louis to Chicago O'Hare Intl Airport
Compare and see reviews for airlines that fly from St. Louis to Chicago O'Hare Intl Airport with momondo
| Airline | Rating | Free Cancellation | Price | ||
|---|---|---|---|---|---|
| PriceFrom $115 | Free Cancellation | Rating 7.2 10,000 reviews | |||
| PriceFrom $122 | Free Cancellation | Rating 6.5 27 reviews | |||
| PriceFrom $127 | Free Cancellation | Rating 7.4 8,809 reviews |
United Airlines Flights From St. Louis to Chicago O'Hare Intl Airport
The lowest priced United Airlines flight from St. Louis to Chicago O'Hare Intl Airport from the last 72 hours was $127. Generally, United Airlines has 43 flights on this route every week with an average price of $308. United Airlines is rated 7.4/10 by our users.
American Airlines Flights From St. Louis to Chicago O'Hare Intl Airport
American Airlines is also a popular choice for this route. American Airlines flight deals for St. Louis to Chicago O'Hare Intl Airport start from as low as $115 round-trip, depending on your selected dates, with average American Airlines deals seen on momondo around $268. American Airlines operates 33 flights to Chicago O'Hare Intl Airport from St. Louis in an average week. Users have rated it 7.2/10 across 10,000 reviews.
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?
Yes. All flights to Chicago from St. Louis on momondo can be compared and filtered by various policies on offer, including flexible booking.
How can momondo help me find flights from St. Louis to Chicago?
Once all potential St. Louis to Chicago flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.
I’m not ready to book a flight from St. Louis to Chicago right now. Can momondo alert me if prices change?
Of course. momondo tracks the price of St. Louis to Chicago flights. All you need is a valid email address and we will do the rest; it is that quick and easy.