Cheap flights from Chicago to St. Louis

Flights overview

Useful information for finding cheap flights from Chicago to St. Louis and booking your next trip
Cheapest round-trip flights $161
Frontier 1 stop 15 hr Sat, Feb 7 — Mon, Feb 9
The cheapest round-trip flight from Chicago to St. Louis is currently $161
Cheapest one-way flight $70
Frontier 1 stop 14 hr Wed, Mar 4
The cheapest one-way flight from Chicago to St. Louis is currently $70
Cheapest nonstop flights $252
Southwest Nonstop 2 hr Sat, Apr 11 — Mon, Apr 13
The cheapest nonstop round-trip flight from Chicago to St. Louis is currently $252
Last-minute weekend getaway $236
Frontier 1 stop 12 hr Thu, Jan 29 — Sun, Feb 1
The cheapest last-minute weekend getaway from Chicago to St. Louis is currently $236
Cheapest business class flights $415
American Nonstop 2 hr Sat, Apr 18 — Mon, Apr 20
The cheapest business class round-trip flight from Chicago to St. Louis is currently $415
Fastest flight 1 hr 10 min The fastest nonstop flight from Chicago to St. Louis takes 1 hr 10 min
Nonstop flights Every day There are direct flights on this route every day.

When is the cheapest time to fly?

The cheapest month to fly from Chicago to St. Louis is typically August. The most expensive month to fly is typically July.
August
Cheapest
Typical prices: $95–205
July
Most expensive
Typical prices: $180–230

Popular airlines from Chicago to St. Louis

  • Southwest
    Nonstop
    from $252
    Typical price: $140–460
    27 weekly nonstop flights
    MDW - STL Every day
    2313 weekly connecting flights
    MDW, ORD - STL Every day
  • United
    Nonstop
    from $252
    Typical price: $160–490
    55 weekly nonstop flights
    ORD - STL Every day
    215 weekly connecting flights
    ORD - STL Every day
  • American
    Nonstop
    from $207
    Typical price: $150–475
    27 weekly nonstop flights
    ORD - STL Every day
    527 weekly connecting flights
    ORD - STL Every day
  • Delta
    from $272
    Typical price: $205–500
    554 weekly connecting flights
    MDW, ORD - STL Every day
  • Frontier
    from $161
    Typical price: $160–420
    35 weekly connecting flights
    MDW, ORD - STL Every day
  • Alaska
    from $373
    Typical price: $465–990
    18 weekly connecting flights
    ORD - STL Every day

Popular airports near Chicago

  • Chicago O'Hare International Airport (ORD)
    Chicago United States 27 min 16 mi
  • Chicago Midway International Airport (MDW)
    Chicago United States 25 min 9 mi
  • Milwaukee Mitchell International Airport (MKE)
    Milwaukee United States 1 hr 24 min 75 mi
  • Indianapolis International Airport (IND)
    Indianapolis United States 2 hr 58 min 165 mi

Popular airports near St. Louis

  • St. Louis Lambert International Airport (STL)
    St. Louis United States 21 min 12 mi
  • General Wayne A. Downing Peoria International Airport (PIA)
    Peoria United States 2 hr 35 min 143 mi
  • MidAmerica St. Louis Airport (BLV)
    Belleville United States 34 min 20 mi
  • Indianapolis International Airport (IND)
    Indianapolis United States 3 hr 29 min 222 mi

Frequently asked questions about flying from Chicago to St. Louis

The cheapest flights from Chicago to St. Louis are usually in August. Typical ticket prices in August range from $95 to $205.
The cheapest round-trip flight from Chicago to St. Louis recently found on Google Flights was with Frontier from $161. The cheapest one-way flight was with Frontier from $70.

Some of the cheapest round-trip deals we found with different airlines:
  • The cheapest Southwest flight from Chicago to St. Louis is $252, flying from Apr 11 to Apr 13.
  • The cheapest United flight from Chicago to St. Louis is $252, flying from Apr 18 to Apr 20.
  • The cheapest American flight from Chicago to St. Louis is $207, flying from Feb 21 to Feb 22.
  • The cheapest Delta flight from Chicago to St. Louis is $272, flying from Apr 18 to Apr 20.
  • The cheapest Frontier flight from Chicago to St. Louis is $161, flying from Feb 21 to Feb 23.
  • The cheapest Alaska flight from Chicago to St. Louis is $373, flying from Feb 27 to Mar 2.
The cheapest round-trip flight from Chicago to St. Louis starts at $161 from Sat, Feb 7 to Mon, Feb 9. The cheapest one-way flight starts at $70 and departs on Wed, Mar 4.
1 hr 10 min is the shortest flight time from Chicago to St. Louis.
Apr–Sep is the most popular time to visit, coinciding with hot, humid summer and events like Fair St. Louis, a huge Fourth of July festival at Forest Park, and the Taste of St. Louis food festival (Sep). Weather in winter is cold, with occasional snow.
It's easy to use Google Flights to find the cheapest days to fly from Chicago to St. Louis.
Just click the Departure label near the top of the page to open the calendar. Choose a start date and a return date to see how the round-trip fare changes on those specific days.
Adjust the trip type to see one-way fares. The cheapest available flights are highlighted and easy to spot. Once you settle on dates, click the Search button to see flight options and book the deal.

You can also turn on price tracking to get alerts if the price changes for a route or flight.
What counts as the best airline for your flights from Chicago to St. Louis really depends on your individual needs. You may have a favorite carrier or a loyalty program you like, but price, convenience, and airports served also come into play. Flexibility and booking terms – Can you change flights if you want to stay longer or get a refund if you have to postpone your trip? – are also factors that help determine which airline is best to fly from Chicago to St. Louis.

In terms of nonstop flights, United is the most popular. United offers 55 nonstop flights and 215 connecting flights per week. United flies from Chicago O'Hare International Airport (ORD) to St. Louis Lambert International Airport (STL) .

In terms of flights, Southwest is the most popular. Southwest offers 27 nonstop flights and 2,313 connecting flights per week. Southwest flies from Chicago Midway International Airport (MDW) , Chicago O'Hare International Airport (ORD) to St. Louis Lambert International Airport (STL) .

Other popular airlines flying from Chicago to St. Louis are:
  • American offers 27 nonstop flights and 527 connecting flights per week. American flies from Chicago O'Hare International Airport (ORD) to St. Louis Lambert International Airport (STL) .
  • Delta offers 554 connecting flights per week. Delta flies from Chicago Midway International Airport (MDW) , Chicago O'Hare International Airport (ORD) to St. Louis Lambert International Airport (STL) .
  • Frontier offers 35 connecting flights per week. Frontier flies from Chicago Midway International Airport (MDW) , Chicago O'Hare International Airport (ORD) to St. Louis Lambert International Airport (STL) .
  • Alaska offers 18 connecting flights per week. Alaska flies from Chicago O'Hare International Airport (ORD) to St. Louis Lambert International Airport (STL) .
The number of connecting flights refers to distinct flights with at least one stop between Chicago and St. Louis.
The cheapest round-trip flight from Chicago to St. Louis recently found on Google Flights was with Frontier from $161. The cheapest one-way flight was with Frontier from $70.

Some of the cheapest round-trip deals we found with different airlines:
  • The cheapest Southwest flight from Chicago to St. Louis is $252, flying from Apr 11 to Apr 13.
  • The cheapest United flight from Chicago to St. Louis is $252, flying from Apr 18 to Apr 20.
  • The cheapest American flight from Chicago to St. Louis is $207, flying from Feb 21 to Feb 22.
  • The cheapest Delta flight from Chicago to St. Louis is $272, flying from Apr 18 to Apr 20.
  • The cheapest Frontier flight from Chicago to St. Louis is $161, flying from Feb 21 to Feb 23.
  • The cheapest Alaska flight from Chicago to St. Louis is $373, flying from Feb 27 to Mar 2.
Southwest, United and American fly direct from Chicago to St. Louis.
  • There are 27 Southwest direct flights from Chicago to St. Louis per week. Flights are available every day.
  • There are 55 United direct flights from Chicago to St. Louis per week. Flights are available every day.
  • There are 27 American direct flights from Chicago to St. Louis per week. Flights are available every day.
Use the Stops filter while searching for flights, to see only nonstop options in your results.
The cheapest last-minute deal between Chicago and St. Louis at price $236 is offered by Frontier from Thu, Jan 29 to Sun, Feb 1.
Southwest, United and American fly direct from Chicago to St. Louis.
  • There are 27 Southwest direct flights from Chicago to St. Louis per week. Flights are available every day.
  • There are 55 United direct flights from Chicago to St. Louis per week. Flights are available every day.
  • There are 27 American direct flights from Chicago to St. Louis per week. Flights are available every day.
Use the Stops filter while searching for flights, to see only nonstop options in your results.
There are direct flights from Chicago to St. Louis on a daily basis.
The cheapest direct (nonstop) round-trip flights between Chicago and St. Louis start at $252 from Sat, Apr 11 to Mon, Apr 13 with Southwest.
It's easy to find nonstop flights with Google Flights! Once you've searched for flights from Chicago to St. Louis, just select the nonstop flights only option in the 'Stops’ filter in the search form and view all available direct flights and their prices.
The cheapest business class round-trip flights between Chicago and St. Louis start at $415 from Sat, Apr 18 to Mon, Apr 20 with American.
The cheapest economy class round-trip flights between Chicago and St. Louis start at $161 from Sat, Feb 7 to Mon, Feb 9.
To book business class trips from Chicago to St. Louis, look for the default Economy selection at the top, and change it to your desired cabin class such as Premium Economy, Business Class, or First Class. You can then select your departure and arrival dates, consider available options, and book your business travel.

You can also adjust the trip type to view one-way fares.
The best last-minute getaway deal for the next weekend between Chicago and St. Louis starts at $236 from Thu, Jan 29 to Sun, Feb 1 with Frontier.
The cheapest last-minute deal between Chicago and St. Louis at price $236 is offered by Frontier from Thu, Jan 29 to Sun, Feb 1.
To find last-minute flight deals from Chicago to St. Louis, start by entering the city names, select the desired departure and return dates, and hit the Search button to view flight options.

You can check for last-minute flights for the same day or adjust the trip type to see one-way fares.

Search more flights

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