STL - ORD

$59 Find Cheap Flights from St. Louis to Chicago O'Hare Airport - Compare and Save

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Everything you should know

Cheapest round-trip
$157
Typical prices: $237-$475
Frontier
Mon 11/12Mon 11/19
STL - ORD • 1 stop
Cheapest non-stop
$171
Typical prices: $237-$477
American Airlines
Wed 11/21Thu 11/22
STL - ORD • Non-stop
Nonstop flights
Every day
You can fly direct with United Airlines and American Airlines. Average duration is 1h 35m
Direct flights
+1
Direct flights
+1
When to book
22 weeks
in advance
Our data shows that travelers who book at least 22 weeks in advance save around 59% compared to booking last minute.
Insights
Insights
When to travel
October
Cheapest • 10% price drop
February
Most popular
Good to know
+1
Good to know
+1
Top layover airports
Minneapolis St Paul (MSP)
Cheapest • Avg $290 (round-trip)
Quincy Regional (UIN)
Shortest trip • 3h 21m (one-way)
Insights
Insights
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We hope you love your trip to Chicago O'Hare Intl Airport!

Cheap Flights from St. Louis to O'Hare Intl (STL-ORD)

 

Cheap flights from St. Louis to O'Hare Intl with top airlines, updated regularly. Compare round-trip, one-way, direct and last-minute deals.

Thu, Nov 12 - Thu, Nov 19
Frontier Logo
12:14 pm - 7:15 pmSTL  Lambert-St Louis-ORD Chicago O'Hare Intl
7h 01m1 stop Dallas/Fort Worth
Frontier Logo
7:31 am - 6:39 pmORD  Chicago O'Hare Intl-STL Lambert-St Louis
11h 08m1 stop Atlanta Hartsfield-Jackson
$157Frontier
Thu, Nov 19 - Mon, Nov 23
Frontier Logo
7:24 pm - 12:13 amSTL  Lambert-St Louis-ORD Chicago O'Hare Intl
4h 49m1 stop Atlanta Hartsfield-Jackson
Frontier Logo
7:49 am - 5:40 pmORD  Chicago O'Hare Intl-STL Lambert-St Louis
9h 51m1 stop Atlanta Hartsfield-Jackson
$159Frontier
Wed, Nov 18 - Sun, Nov 22
Frontier Logo
4:18 pm - 12:21 amSTL  Lambert-St Louis-ORD Chicago O'Hare Intl
8h 03m1 stop Denver Intl
Frontier Logo
5:12 pm - 11:59 pmORD  Chicago O'Hare Intl-STL Lambert-St Louis
6h 47m1 stop Orlando
$162Frontier
Wed, Nov 18 - Mon, Nov 23
Frontier Logo
4:18 pm - 12:21 amSTL  Lambert-St Louis-ORD Chicago O'Hare Intl
8h 03m1 stop Denver Intl
Frontier Logo
7:49 am - 5:40 pmORD  Chicago O'Hare Intl-STL Lambert-St Louis
9h 51m1 stop Atlanta Hartsfield-Jackson
$162Frontier
Sun, Nov 22 - Sun, Nov 22
United Airlines Logo
10:53 am - 12:29 pmSTL  Lambert-St Louis-ORD Chicago O'Hare Intl
1h 36mnonstop
United Airlines Logo
4:35 pm - 6:09 pmORD  Chicago O'Hare Intl-STL Lambert-St Louis
1h 34mnonstop
$171United Airlines
Sat, Nov 21 - Sun, Nov 22
American Airlines Logo
8:12 pm - 9:48 pmSTL  Lambert-St Louis-ORD Chicago O'Hare Intl
1h 36mnonstop
American Airlines Logo
6:40 pm - 8:04 pmORD  Chicago O'Hare Intl-STL Lambert-St Louis
1h 24mnonstop
$171American Airlines
Sat, Nov 21 - Sun, Nov 22
American Airlines Logo
8:12 pm - 9:48 pmSTL  Lambert-St Louis-ORD Chicago O'Hare Intl
1h 36mnonstop
American Airlines Logo
6:40 pm - 8:04 pmORD  Chicago O'Hare Intl-STL Lambert-St Louis
1h 24mnonstop
$172American Airlines
Sun, Nov 22 - Wed, Nov 25
United Airlines Logo
6:50 pm - 8:19 pmSTL  Lambert-St Louis-ORD Chicago O'Hare Intl
1h 29mnonstop
United Airlines Logo
2:12 pm - 3:43 pmORD  Chicago O'Hare Intl-STL Lambert-St Louis
1h 31mnonstop
$181United Airlines
Mon, Nov 16 - Mon, Nov 23
United Airlines Logo
5:34 pm - 7:05 pmSTL  Lambert-St Louis-ORD Chicago O'Hare Intl
1h 31mnonstop
United Airlines Logo
10:00 pm - 11:24 pmORD  Chicago O'Hare Intl-STL Lambert-St Louis
1h 24mnonstop
$181United Airlines
Mon, Dec 14 - Thu, Jan 7
United Airlines Logo
6:30 am - 7:57 amSTL  Lambert-St Louis-ORD Chicago O'Hare Intl
1h 27mnonstop
United Airlines Logo
8:10 pm - 9:37 pmORD  Chicago O'Hare Intl-STL Lambert-St Louis
1h 27mnonstop
$191United Airlines

Price, demand and travel trends for St. Louis to Chicago O'Hare Intl Airport flights

Use KAYAK data on prices, travel dates, airlines and seasonal trends to compare options and book flights with more confidence.

How much is a round-trip flight from St. Louis to Chicago O'Hare Intl Airport?

Round-trip flights from St. Louis to Chicago O'Hare Intl Airport typically range from $237 to $475. The lowest price found in the past 5 days was $157, on Frontier.

What's the cheapest day of the week to fly from St. Louis to Chicago O'Hare Intl Airport?

Based on deals KAYAK users found in the last 12 months, Saturday is the cheapest day of the week to fly from St. Louis to Chicago O'Hare Intl Airport. It’s 16% cheaper than the average day, while Monday is the most expensive, with prices 14% higher.

What’s the cheapest month to fly from St. Louis to Chicago O'Hare Intl Airport?

•October is the cheapest month to fly from St. Louis to Chicago O'Hare Intl Airport at $297 round-trip.
•January ($468) and July ($407) are the most expensive months.
•The price difference between flying in the cheapest and most expensive months is 57% on average.
This is based on KAYAK aggregated and averaged internal data over the past 12 months.

When are flights from St. Louis to Chicago O'Hare Intl Airport the cheapest?

Flights from St. Louis to Chicago O'Hare Intl Airport are cheapest 22 weeks before departure. Booking in this window typically costs about 59% less than the average last-minute fare (within 2 weeks of the flight), based on KAYAK data.

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Expert advice for your flight from St. Louis to O'Hare Intl

 
KAYAK teamed up with top travel experts to share the best tips for your journey.
Our travel experts
Stefanie Waldek

Stefanie Waldek

Expert on Qatar Airways, United Airlines and ORD

Stefanie Waldek is a freelance space, travel, and design writer based in Saratoga Springs, NY. Her words have appeared in Space.com, Travel + Leisure, Condé Nast Traveler, Architectural Digest, and House Beautiful, among other publications. An expert in aviation and expedition cruising, Stefanie is frequently up in the air or on the sea, likely en route to Antarctica or the Arctic.

Read more
Gabriel Leigh

Gabriel Leigh

Expert on ANA

Gabriel is a writer and video creator. As senior content producer for Flightradar24 and Monocle’s transport correspondent, he keeps a close eye on aviation in particular. He has also written travel articles for the likes of The New York Times. Born in New York but raised around the world, he now lives in Sweden. He’s been to 75 countries, flying 2.3 million miles on 113 airlines and through 234 airports in the process.

Read more
Jessica Macdonald

Jessica Macdonald

Expert on Lufthansa

Currently based in Scotland after living in South Africa and the United States, Jessica has been writing travel and aviation content for more than 10 years. She regularly contributes to Travel + Leisure and TripSavvy, and has had work published by Condé Nast Traveller and The Independent. She has traveled to more than 50 countries across six continents.

Read more
Duncan Madden

Duncan Madden

Expert on British Airways

Duncan is a freelance travel writer, copywriter and book author in constant search of travel stories and the perpetual sensation of being on holiday. He’s never happier than when on a dusty trail in search of empty waves or ducking under the piste tape in search of snowbound solitude. British born, living in Germany, but happiest heading for the horizon. His first book, Found in Translation, explores the etymologies and stories of country names around the world and is out now.

Read more
Harriet Baskas

Harriet Baskas

Expert on American Airlines

Harriet is an award-winning journalist who is happiest in an airport or an unusual museum. Her stories about airports, air travel, and the business of travel have appeared on NBC News, CNBC, USA TODAY, The Points Guy and other outlets. She is the creator of the StuckatTheAirport.com blog and the author of nine books. When not out on the road or exploring the latest airport amenities, she’s home in Seattle getting ready for the next adventure.

Read more
Yulia Denisyuk

Yulia Denisyuk

Expert on STL

Yulia is a freelance journalist who’s dispatched from 90+ countries. Her work focuses on cultures, adventure trips and air travel, appearing in NatGeo, NYT, CNTraveler, and more. For past assignments, she’s stayed with nomads in Mongolia and learned the art of Imigongo in Rwanda. She’s based in Chicago; in winter she often questions that decision.

Read more

Key details for St. Louis to Chicago O'Hare Intl Airport flights

Low season

August

Cheapest flight

$59
Beat the crowds with an average 16% drop in travelers.
The most popular month to fly with an average 17% increase in travelers.
One-way flight from St. Louis to Chicago O'Hare Intl Airport

When to book flights from St. Louis to O'Hare Intl

Are your dates flexible? Find out the best times to travel from St. Louis to O'Hare Intl based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price

Your St. Louis to Chicago O'Hare Intl Airport flight questions, answered

Find helpful answers about this route, including flight times, airports, airlines and booking tips.

  • What are the earliest and latest flights from St. Louis to Chicago O'Hare Intl Airport?

    These are the earliest and latest flight times available from St. Louis to Chicago O'Hare Intl Airport:

    • Earliest: departs at 5:00 am and lands at 6:35 am
    • Latest: departs at 8:24 pm and lands at 9:59 pm.

    The flight takes about 1h 35m.

  • What cabin classes can I book on flights from St. Louis to Chicago O'Hare Intl Airport?

    Three cabin classes are available on flights from St. Louis to Chicago O'Hare Intl Airport:

    • Economy Class
    • Business Class
    • First Class

  • How long is a flight from St. Louis to Chicago O'Hare Intl Airport?

    A nonstop flight from St. Louis to Chicago O'Hare Intl Airport takes 1h 35m, covering 258 miles.

  • Do I need a passport to fly from St. Louis to Chicago O'Hare Intl Airport?

    No, a passport is not required for this domestic route, but you will need a real ID-compliant driver's license, a state ID or another TSA-accepted form of identification.

  • How much should I expect to pay for a St. Louis to Chicago O'Hare Intl Airport flight?

    Round-trip flights from St. Louis to Chicago O'Hare Intl Airport range from $237 to $475, with an average of $332 over the past 12 months. Anything below $237 counts as a good deal.

  • How expensive are last-minute St. Louis to Chicago O'Hare Intl Airport flights?

    Last-minute fares on this route (booked within two weeks of departure) run 73% above the $332 route average. Book 22 weeks before departure for the lowest fares.

  • How much can I save by taking a layover when flying from St. Louis to Chicago O'Hare Intl Airport?

    On this route, layover flights are cheaper than nonstop options on average. Layover fares average $290 round-trip via Minneapolis St Paul (MSP), compared to $334 for nonstop.

  • What is the standard checked-bag allowance on flights from St. Louis to Chicago O'Hare Intl Airport?

    There is no standard. Checked-bag policies vary by airline on this route. Most carriers charge $40–$100 for the first checked bag in economy. Premium fares and elite-status bookings typically include a free checked bag.

  • Which aircraft model is used most often on flights from St. Louis to Chicago O'Hare Intl Airport?

    The Airbus A319 family is used most often on this route, operated mainly by United Airlines and American Airlines. Other aircraft seen on the route include Canadair (Bombardier) Regional Jet CRJ-550 variants.

  • How are flight departures from St. Louis to Chicago O'Hare Intl Airport spread across the day?

    Morning is the busiest departure period on St. Louis to Chicago O'Hare Intl Airport flights, with 57% of flights leaving in that window. Evening departures account for 25%, afternoon flights for 18%, and night flights for 0%.

  • Have flight prices from St. Louis to Chicago O'Hare Intl Airport changed much recently?

    Yes. Based on fares seen in the past 5 days, round-trip prices on this route showed a wide range, from about $157 to $1,152. That means the highest observed fare was about 7x higher than the lowest one.

  • Which airlines offer Wi-Fi on St. Louis to Chicago O'Hare Intl Airport flights?

    American Airlines is the only airline on the St. Louis to Chicago O'Hare Intl Airport route offering in-flight Wi-Fi. Pricing depends on fare class.

  • How are flight prices from St. Louis to Chicago O'Hare Intl Airport looking right now?

    One-way fares from St. Louis to Chicago O'Hare Intl Airport are currently lower than usual. Average one-way flight prices are about $69, which is 73% below the typical average for this route.

  • What car rental options are available at Chicago O'Hare Intl Airport (ORD)?

    Chicago O'Hare Intl Airport (ORD) hosts 5 major car rental companies, with daily rates starting from around $17 for economy cars. Top options include:

    • Routes Car & Truck Rentals
    • Europcar
    • Hertz
    • Ace
    • Dollar

  • Which airports can I use when flying from St. Louis to Chicago O'Hare Intl Airport?

    Flights from St. Louis to Chicago O'Hare Intl Airport usually depart from Lambert-St Louis (STL) and arrive at Chicago O'Hare Intl (ORD).

  • Which airports do connecting flights from St. Louis to Chicago O'Hare Intl Airport pass through?

    One-stop flights from St. Louis to Chicago O'Hare Intl Airport most commonly connect through:

    • Denver Intl (DEN) - 25% of one-stop connections
    • Minneapolis St Paul (MSP) - 25% of one-stop connections
    • Seattle/Tacoma Intl (SEA) - 25% of one-stop connections
    • Quincy Regional (UIN) - 25% of one-stop connections

  • Can I save money by using flexible dates for flights from St. Louis to Chicago O'Hare Intl Airport?

    Yes. Flexible dates can save you up to 27% on flights from St. Louis to Chicago O'Hare Intl Airport. Saturday is the cheapest departure day at $280 round-trip on average, while Monday is the most expensive at $379, a difference of $99.

    Cheaper weekend fares like these are typical of routes dominated by weekday business travel.

  • What airlines fly from St. Louis to Chicago O'Hare Intl Airport?

    2 airlines operate flights between St. Louis and Chicago O'Hare Intl Airport. The airlines offering nonstop flights on this route include:

    • United Airlines
    • American Airlines

  • How much time can I save by choosing a different layover airport from St. Louis to Chicago O'Hare Intl Airport?

    Flying via Quincy Regional (UIN) gives the shortest average 1-stop total travel time at 3h 21m, compared with 4h 36m via Minneapolis St Paul (MSP) and 13h 08m via Seattle/Tacoma Intl (SEA).

  • What popular places can I visit in Chicago O'Hare Intl Airport?

    Some of the most popular sights in Chicago O'Hare Intl Airport are Magnificent Mile, Grant Park and Soldier Field. These are among the most viewed places in Chicago O'Hare Intl Airport on KAYAK.

  • Which airlines offer extra legroom and free seat selection on St. Louis to Chicago O'Hare Intl Airport flights?

    Among airlines operating St. Louis to Chicago O'Hare Intl Airport flights:

    • United Airlines: offers extra legroom; offers free seat selection
    • American Airlines: offers extra legroom; offers free seat selection

    Extra legroom and free seat selection availability depends on fare class and route.

  • Which airlines include bags at no extra cost on St. Louis to Chicago O'Hare Intl Airport flights?

    Here are some options for this route, based on selected ticket types and cabin classes:

    • United Airlines: a cabin bag and a checked bag in Economy Class
    • American Airlines: a cabin bag and a checked bag in Economy Class

    Bag allowance can vary by ticket type, cabin class, route and airline, so always check the fare details before booking.

Your guide to booking St. Louis to Chicago O'Hare Intl Airport flights

Get tips on when to book, when to fly and what to know before your trip.
  • If your dates are flexible, aim for a Saturday departure and avoid flying on Monday. On this route, Saturday flights average $280, about $99 less than Monday fares (26% savings) based on the last 12 months.
  • For the best chance at a low fare, aim to book around 22 weeks before you fly. On this route, that window historically saves about 59% versus last-minute pricing (KAYAK booking data, last 12 months).
  • If you can choose when to travel, plan your St. Louis to Chicago O'Hare Intl Airport trip for October. Fares historically average $297 round-trip in that month - typically $171 less than the most expensive month, which is January (based on the last 12 months).
  • If you have the time, taking a 1-stop flight through Minneapolis St Paul Airport (MSP) can be cheaper than flying direct. The cheapest layover option averages $290 round-trip on this route - about $43 less than direct flights (based on the last 12 months).

Prefer to fly direct from St. Louis to Chicago O'Hare Airport?

 
Find which airlines fly direct from Lambert-St Louis Airport to Chicago O'Hare Intl Airport, which days they fly and book direct flights.

Direct departures

Lambert-St Louis to Chicago O'Hare Intl

Monday

American Airlines,United Airlines

American Airlines,United Airlines

Tuesday

American Airlines,United Airlines

American Airlines,United Airlines

Wednesday

American Airlines,United Airlines

American Airlines,United Airlines

Thursday

American Airlines,United Airlines

American Airlines,United Airlines

Friday

American Airlines,United Airlines

American Airlines,United Airlines

Saturday

American Airlines,United Airlines

American Airlines,United Airlines

Sunday

American Airlines,United Airlines

American Airlines,United Airlines

See more direct flights

Direct returns

Chicago O'Hare Intl to Lambert-St Louis

Monday

American Airlines,United Airlines

American Airlines,United Airlines

Tuesday

American Airlines,United Airlines

American Airlines,United Airlines

Wednesday

American Airlines,United Airlines

American Airlines,United Airlines

Thursday

American Airlines,United Airlines

American Airlines,United Airlines

Friday

American Airlines,United Airlines

American Airlines,United Airlines

Saturday

American Airlines,United Airlines

American Airlines,United Airlines

Sunday

American Airlines,United Airlines

American Airlines,United Airlines

See more direct flights

More options for your flight from St. Louis to O'Hare Intl

Complete your trip to Chicago with a hotel stay or car rental

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