Cheap flights from Chicago O'Hare Intl Airport to St. Louis from $59
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 12/10. 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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Fly from
Fly to
Route
Depart
Return
ChicagoSt. Louis
ORD Chicago O'Hare Intl - STL Lambert-St Louis
ORDSTL
Chicago O'Hare Intl
Sat 11/21
6:40 pm-8:04 pm
Nonstop1h 24m
Lambert-St Louis
Sun 11/22
8:12 pm-9:48 pm
Nonstop1h 36m
ChicagoSt. Louis
ORD Chicago O'Hare Intl - STL Lambert-St Louis
ORDSTL
Chicago O'Hare Intl
Sat 11/21
9:59 am-4:41 pm
1 stop6h 42m
Lambert-St Louis
Sun 11/22
6:40 am-10:39 am
1 stop3h 59m
ChicagoSt. Louis
ORD Chicago O'Hare Intl - STL Lambert-St Louis
ORDSTL
Chicago O'Hare Intl
Wed 10/28
6:30 am-3:23 pm
1 stop8h 53m
Lambert-St Louis
Fri 10/30
7:59 pm-6:16 pm
2 stops22h 17m
ChicagoSt. Louis
ORD Chicago O'Hare Intl - STL Lambert-St Louis
ORDSTL
Chicago O'Hare Intl
Sat 11/21
9:59 am-4:41 pm
1 stop6h 42m
Lambert-St Louis
Sun 11/22
6:40 am-10:39 am
1 stop3h 59m
ChicagoSt. Louis
ORD Chicago O'Hare Intl - STL Lambert-St Louis
ORDSTL
Chicago O'Hare Intl
Fri 11/6
6:03 pm-7:22 pm
Nonstop1h 19m
Lambert-St Louis
Sun 11/8
8:15 pm-9:51 pm
Nonstop1h 36m
ChicagoSt. Louis
ORD Chicago O'Hare Intl - STL Lambert-St Louis
ORDSTL
Chicago O'Hare Intl
Thu 12/3
6:30 pm-7:58 pm
Nonstop1h 28m
Lambert-St Louis
Sun 12/6
1:43 pm-3:24 pm
Nonstop1h 41m
ChicagoSt. Louis
ORD Chicago O'Hare Intl - STL Lambert-St Louis
ORDSTL
Chicago O'Hare Intl
Tue 12/8
9:45 pm-10:59 pm
Nonstop1h 14m
Lambert-St Louis
Wed 12/9
5:25 am-6:58 am
Nonstop1h 33m
ChicagoSt. Louis
ORD Chicago O'Hare Intl - STL Lambert-St Louis
ORDSTL
Chicago O'Hare Intl
Thu 11/5
10:00 pm-11:24 pm
Nonstop1h 24m
Lambert-St Louis
Mon 11/9
9:40 am-11:16 am
Nonstop1h 36m
ChicagoSt. Louis
ORD Chicago O'Hare Intl - STL Lambert-St Louis
ORDSTL
Chicago O'Hare Intl
Thu 11/19
8:50 pm-10:14 pm
Nonstop1h 24m
Lambert-St Louis
Mon 11/23
5:29 pm-7:10 pm
Nonstop1h 41m
ChicagoSt. Louis
ORD Chicago O'Hare Intl - STL Lambert-St Louis
ORDSTL
Chicago O'Hare Intl
Thu 11/5
10:00 pm-11:24 pm
Nonstop1h 24m
Lambert-St Louis
Mon 11/9
9:40 am-11:16 am
Nonstop1h 36m
See travel insights to St. Louis from
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 typical price of a round-trip flight between Chicago O'Hare Intl Airport and St. Louis?
Prices are currently low for flights on this route.
Typical prices usually range from $227 to $535.The lowest price recently found on this route was $172.
What is the cheapest month to fly to St. Louis?
In general, December 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 $213. The month of November is another great option to travel to St. Louis, with average flight prices from Chicago O'Hare Intl Airport averaging around $302.
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 Saturday when prices can be found for as low as $358. 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 $534. 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 at noon is the least expensive time of day to depart. momondo users have found prices as low as $379 when looking at flights departing at noon. In the evening is when there is more demand to fly to St. Louis, so prices are often more expensive at around $518 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
What cabin class options are available on Chicago O'Hare Intl Airport to St. Louis flights?
There are 4 cabin classes available to choose from on Chicago O'Hare Intl Airport to St. Louis flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.
How have Chicago O'Hare Intl Airport to St. Louis flight prices changed over time?
As of October 2026, prices for Chicago O'Hare Intl Airport to St. Louis flights are approximately 0% more expensive when compared to flights at the same time last year.
What is the cheapest airline that flies from Chicago O'Hare Intl to Lambert-St Louis?
United Airlines and Delta are the most popular carriers operating from Chicago O'Hare Intl to Lambert-St Louis
What airlines fly to St. Louis?
United Airlines, American 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. United Airlines is the first choice among our users, with 73% of people opting to fly with this airline when traveling to St. Louis. Keep in mind that there are 3 different airlines that fly to St. Louis on a routine basis, so you have a few additional options to choose from.
How often are flights from Chicago to St. Louis delayed?
Historically, on average around 21% of flights between Chicago and St. Louis have experienced a delay on any given week. The average delay length over the past 12 months has been 129 minutes.
What is the most punctual flight time for Chicago to St. Louis flights?
Generally, flights departing in the morning tend to experience fewer delays. Flights in the evening have, in the past, seen delays more frequently in comparison.
What day of the week experiences the fewest flight delays on this route?
Tuesday is statistically the day of the week which experiences the fewest number of delays on this flight route. Friday has historically seen more delays on average compared to the rest of the week.
Which airline has the best punctuality record on Chicago to St. Louis flights?
According to our data, United Airlines have had the least number of delays on this route over the last 12 months; with about 20% of their flights experiencing any sort of delay.
How many flights depart from Chicago O'Hare Intl Airport to St. Louis on average per day?
As of October 2026, 46 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 42% 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?
328 flights are operational weekly from Chicago O'Hare Intl Airport to St. Louis as of October 2026. The most popular departure day for this route is Thu, with 19% 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
Frequently asked questions about flying 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 24m.
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 2 as of October 2026.
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 Boeing 737-800 (16.35% of total bookings). The next most popular plane models are Airbus A319 (15.53%), Canadair (Bombardier) Regional Jet CRJ-550 (13.58%), and Embraer 175 (Enhanced Winglets) (10.50%).
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 United Airlines, representing 78% of all bookings. The subsequent popular airline is American Airlines at 22%.
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 $151 | Free Cancellation | Rating 7.0 12,152 reviews | |||
| PriceFrom $184 | Free Cancellation | Rating 7.4 10,332 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 $184. Generally, United Airlines has 44 flights on this route every week with an average price of $506. United Airlines is rated 7.4/10 by our users.
American Airlines Flights From Chicago O'Hare Intl Airport to St. Louis
American Airlines (7.0/10 from 12,152 reviews) operates around 15 flights from Chicago O'Hare Intl Airport to St. Louis in any given week. The average American Airlines airfare for this route is around $396, with deals from around $151 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.
Traveling to a place near St. Louis?
Book flights to St. Louis if you plan to visit one of these locationsWhy use momondo?
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.