Q: What is the typical price of a round-trip flight between Chicago and St. Louis?

Prices are currently low for flights on this route. Typical prices usually range from $231 to $540. The lowest price recently found on this route was $91.

Question 1

How often are flights from Chicago to St. Louis delayed?

Accepted Answer

Historically, on average around 16% 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 118 minutes.

Question 2

What is the cheapest airline that flies from Chicago to Lambert-St Louis?

Accepted Answer

Southwest, Frontier, and Delta are the most popular carriers operating from Chicago to Lambert-St Louis

Question 3

Which airport is the most popular layover for flights between Chicago and St. Louis?

Accepted Answer

Quincy (UIN) was the most common stop: 67% of momondo users choosing 1-stop flights on this route connected there.

Question 4

What cabin class options are available on Chicago to Lambert-St Louis flights?

Accepted Answer

There are 4 cabin classes available to choose from on Chicago to Lambert-St Louis flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Question 5

What is the typical price of a round-trip flight between Chicago and St. Louis?

Accepted Answer

Prices are currently low for flights on this route.Typical prices usually range from $231 to $540.
The lowest price recently found on this route was $91.

Question 6

What is the cheapest time of day to depart on your flight to St. Louis?

Accepted Answer

Flying to St. Louis from Chicago at noon is the least expensive time of day to depart. momondo users have found prices as low as $313 when looking at flights departing at noon. In the morning is when there is more demand to fly to St. Louis, so prices are often more expensive at around $368 per ticket.

Question 7

Which layover airport offers the lowest fares from Chicago to St. Louis?

Accepted Answer

Flights via Burlington (BRL) offer the lowest average round-trip price of $156.

Question 8

What is the cheapest month to fly to St. Louis?

Accepted Answer

In general, December is the cheapest month to fly from Chicago to St. Louis. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $217. The month of November is another great option to travel to St. Louis, with average flight prices from Chicago averaging around $240.

Question 9

What airlines fly to St. Louis?

Accepted Answer

United Airlines, American Airlines and Southern / Mokulele are the top three most popular airlines that fly to St. Louis from Chicago according to our data. United Airlines is the first choice among our users, with 48% of people opting to fly with this airline when traveling to St. Louis. Keep in mind that there are 5 different airlines that fly to St. Louis on a routine basis, so you have a few additional options to choose from.

Question 10

Which airline has the best punctuality record on Chicago to St. Louis flights?

Accepted Answer

According to our data, Southwest have had the least number of delays on this route over the last 12 months; with about 12% of their flights experiencing any sort of delay.

Question 11

How have Chicago to St. Louis flight prices changed over time?

Accepted Answer

As of February 2026, prices for Chicago to St. Louis flights are approximately 10% more expensive when compared to flights at the same time last year.

Question 12

Which layover airport has the shortest travel time from Chicago to St. Louis?

Accepted Answer

Flights connecting via Quincy (UIN) have the shortest average one-way travel time: 3h 35m.

Question 13

How far in advance should I book a flight to St. Louis?

Accepted Answer

You are more likely to see cheaper flights to St. Louis from Chicago when booking weeks ahead of your departure date. In general, you can expect to find flights to St. Louis for around $301 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to St. Louis from Chicago for as low as $167 on momondo.

Question 14

Can stopping save me money on Chicago to St. Louis flights?

Accepted Answer

No. A direct flight is the cheapest option for a flight between Chicago to St. Louis.

Question 15

What day of the week experiences the fewest flight delays on this route?

Accepted Answer

Tuesday is statistically the day of the week which experiences the fewest number of delays on this flight route. Sunday has historically seen more delays on average compared to the rest of the week.

Question 16

Which layover airport has the shortest connection time from Chicago to St. Louis?

Accepted Answer

Quincy (UIN) has the shortest average layover time for this route: 0h 38m.

Question 17

What is the cheapest Chicago to Lambert-St Louis flight route?

Accepted Answer

Fly from Chicago Midway to Lambert-St Louis for the best Chicago - Lambert-St Louis flight prices

Question 18

What is the cheapest day to depart on your flight to St. Louis?

Accepted Answer

The cheapest day to depart on your flight to St. Louis is on a Friday when prices can be found for as low as $312. 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 Sunday because tickets tend to average around $463. These prices are subject to change though, so be sure to set up a Price Alert for flights to St. Louis.

Question 19

How many flights depart from Chicago to St. Louis on average per day?

Accepted Answer

The number of flights available between Chicago and St. Louis is 51 per day as of February 2026. The most frequent departure time is 4:00PM, with 46% of daily flights leaving in the afternoon.

Question 20

How many flights depart from Chicago to St. Louis on average per week?

Accepted Answer

As of February 2026, there are 359 flights per week flying from Chicago to St. Louis. The most common day of the week flights depart is Fri, with 16% of flights taking off on this day.

Question 21

What is the most punctual flight time for Chicago to St. Louis flights?

Accepted Answer

Generally, flights departing in the morning tend to experience fewer delays. Flights at night have, in the past, seen delays more frequently in comparison.

Question 22

Is flying the fastest way to get from Chicago to St. Louis?

Accepted Answer

The quickest way to travel this route is to take a flight from Chicago to St. Louis, doing so can potentially save up to 4h 35m of travel time. While these options may take longer, booking a train from Chicago to St. Louis or a bus from Chicago to St. Louis may suit your needs if travel time is less of a factor in your decision making.

Question 23

Is flying the cheapest way to get from Chicago to St. Louis?

Accepted Answer

A train from Chicago to St. Louis is currently going to be the least expensive option currently available. You can also find deals for a flight from Chicago to St. Louis starting at $91, or consider a bus from Chicago to St. Louis starting at $87. Both of these alternative options are worth considering when looking to reach your destination.

Question 24

When did momondo last update prices for flights from Chicago to Lambert-St Louis Airport?

Accepted Answer

Prices for flights from Chicago to Lambert-St Louis Airport were last updated today.

Question 25

How many operators does momondo search for flights from Chicago to Lambert-St Louis Airport?

Accepted Answer

As of February 2026, there are 4 operators available to choose from for flights from Chicago to Lambert-St Louis Airport.

Question 26

How old do you have to be to fly from Chicago to Lambert-St Louis Airport?

Accepted Answer

The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Chicago to Lambert-St Louis Airport.

Question 27

What documentation or ID do you need to fly to Lambert-St Louis Airport?

Accepted Answer

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.

Best Price Found	$184
Fastest flight time	1h 10m
Direct flights	Every day
Airports in St. Louis	1 airport

Airline	Rating	Free Cancellation	Price
Southwest	PriceFrom $77	Free Cancellation	Rating 8.0 4,271 reviews	Search Southwest flights
American Airlines	PriceFrom $121	Free Cancellation	Rating 7.2 11,212 reviews	Search American Airlines flights
United Airlines	PriceFrom $144	Free Cancellation	Rating 7.4 9,231 reviews	Search United Airlines flights
Southern / Mokulele	PriceFrom $156	Free Cancellation	Rating 0.0 0 reviews	Search Southern / Mokulele flights

Cheap flights from Chicago to St. Louis from $40

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 to St. Louis departing on 4/4. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

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