The cheapest times to fly from STL to ORD are

  • July 30th to May 13th (except the weeks of August 13th, September 17th, October 8th, and October 22nd)

based on data collected exclusively by Champion Traveler across tens of millions of flights. Among all the dates above, the very cheapest time to fly from STL to ORD is late December. Prices can be as high as $185 for Sunday flights during mid August, or as low as $165 for Thursday flights around late December.


When to Fly to Chicago

Flying from St. Louis, MO (STL) to Chicago, IL (ORD) will usually cost between $165 to $170 per person if booking more than four weeks in advance. On average the very cheapest time to fly is late December with an average ticket price of $165. Due to high demand the most expensive time to fly is mid August, with an average price of $170. Planning your trip to low-cost times can easily save you $5 on economy flights and even more on first-class flights. Generally, any price below $167 can be considered a good price for a round-trip STL to ORD flight.

See below for a graph of average weekly prices for the STL to ORD route. All prices are for round-trip tickets in USD.

STL to ORD Flight Prices

Compared to other flights, the STL to ORD flight is much cheaper than the average and costs much less than the average flight leaving from St. Louis. The average price per mile (for a direct flight) is $0.4, which is a bit above average.


Flight Prices by Day of the Week

Thursday is usually the cheapest day to depart and return on this flight. Sundays are the most expensive days to fly to Chicago, and Saturdays are the most expensive days to return to St. Louis. Selecting flights on the least expensive days could save you up to $3 (2%) on this flight.

Departing prices are for round-trip flights returning on the day of departure. For example, a flight departing on Thursday and returning a week later will cost an average of $165. Return trip prices are from the ORD to STL flight, and often highlight the quality of our data in showing the same trend.

Departing Prices by Day

Departure Day Prices

Return Trip Prices by Day

Return Day Prices


Nonstop Flights and Layovers

Travelers looking to fly from STL to ORD can generally find a 0-layover flight. Because there is a direct flight option the real-world direct flight time of 1 hour 27 minutes may be realistic.


Flight Questions Answered

Still have questions about flying from STL to ORD? We’ve got answers.

Which airlines fly this route?

You can find 9 major airlines flying this route most often: Air Choice One, Alaska, American, Cape Air, Delta, Frontier, Qantas, Sun Country Airlines, United, and potentially more during busy seasons.

How far away is it from Chicago O’Hare International Airport to St Louis Lambert International Airport?

The distance between the two airports is roughly 258 miles or 415 kilometers.

How long does it take to fly from STL to ORD?

The real-world flight time for a nonstop STL to ORD flight is about 1 hour 27 minutes.

How many flights go between St. Louis, MO and Chicago, IL?

It depends on the day of the week and the date, but a typical day might have around 45 available flights from STL to ORD.


Airport Location Info


Departing Airport

Origination code STL
Origination airport name St Louis Lambert International Airport
City St. Louis, MO
Country the United States
Latitude 38.7
Longitude -90.4

Return Airport

Destination code ORD
Destination airport name Chicago O’Hare International Airport
City Chicago, IL
Country the United States
Latitude 42
Longitude -87.9


Late and Early Flight Data

Flights from STL to ORD tend to depart later than the average flight. According to our recently updated data, 34% of flights departed 5 or more minutes late, and 22% of flights left 5 or more minutes early. On average you can expect to leave ORD heading for STL about 24 minutes late. This does significantly impact arrival time, as the average landing time in Chicago, IL is about 21 minutes late. The numbers below show a recent average of take-off times versus the scheduled departure flight:

  • American: 18 minutes late
  • SkyWest: 25 minutes late
  • United: 42 minutes late
  • Envoy: 30 minutes late
  • Republic: 2 minutes early
  • ExpressJet: 20 minutes late
  • Some airlines not reporting


Other Resources

Please note that while we’ve worked hard to analyzed tens of millions of flights to get you this data, we do not calculate current live prices or guarantee pricing. Please see our partners using the links above for current offers.