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Cheap flights from St. Louis to Chicago O'Hare Intl Airport from £44

STL — ORD
11 Dec — 18 Dec1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from St. Louis to O'Hare Intl

Enter your travel dates to find the best prices.

Cheapest flights from St. Louis to O'Hare Intl

Wed 9/1210:50 -
Nonstop1h 35m
Wed 16/1217:50 -
Nonstop1h 36m
Deal found 9/11£104
Tue 15/1206:03 -
1 stop5h 41m
Wed 16/1211:39 -
1 stop5h 41m
Deal found 10/11£117
Sat 5/1211:44 -
1 stop4h 59m
Sat 12/1209:59 -
1 stop4h 45m
Deal found 6/11£119
Thu 24/1209:15 -
Nonstop1h 40m
Thu 31/1206:50 -
Nonstop1h 39m
Deal found 9/11£125
Mon 7/1214:17 -
1 stop4h 09m
Tue 8/1208:39 -
1 stop4h 51m
Deal found 10/11£129
Sat 5/1216:38 -
1 stop3h 37m
Mon 7/1214:41 -
1 stop5h 51m
Deal found 9/11£130
Thu 3/1212:31 -
1 stop4h 12m
Tue 8/1211:39 -
1 stop5h 41m
Deal found 10/11£137
Tue 1/1210:14 -
1 stop6h 03m
Tue 8/1208:39 -
1 stop4h 51m
Deal found 7/11£137
Mon 7/1214:17 -
1 stop4h 09m
Mon 14/1211:39 -
1 stop5h 41m
Deal found 8/11£141
Fri 4/1214:17 -
1 stop4h 09m
Wed 16/1207:05 -
1 stop6h 25m
Deal found 11/11£148
Fri 25/1206:20 -
1 stop6h 46m
Fri 1/107:00 -
1 stop4h 35m
Deal found 10/11£156

Find flight deals from St. Louis to O'Hare Intl

Round-trip from

£104

One-way from

£44

Popular in

January

Cheapest in

December

Average price

£246

Good round-trip deal

£864 or less
United Airlines
  • United Airlines
  • 23/1-30/1
  • Nonstop
  • 3h 11m total
  • St. Louis to Chicago
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United Airlines
  • United Airlines
  • 1/12-31/12
  • Nonstop
  • 1h 28m total
  • St. Louis to Chicago
Search Deals
High demand for flights, 3% potential price rise
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Cheapest flight prices on average. 2% potential price decrease (£6 potential savings vs. average return price).
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Average for round-trip flights in November 2026
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Price to beat on a round-trip flight from Lambert-St Louis to Chicago O'Hare Intl.
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Cheapflights Fare Finder

 
Use the filters below to find and compare flights from St. Louis to Chicago O'Hare Intl Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

St. LouisChicago

STL Lambert-St Louis - ORD Chicago O'Hare Intl

STLORD

Lambert-St Louis

Tue 1/12

08:02-09:30

Nonstop1h 28m

Chicago O'Hare Intl

Wed 31/12

00:00-00:00

Nonstop0h 00m

£52

St. LouisChicago

STL Lambert-St Louis - ORD Chicago O'Hare Intl

STLORD

Lambert-St Louis

Sat 9/1

17:22-21:36

1 stop4h 14m

Chicago O'Hare Intl

Wed 31/12

00:00-00:00

Nonstop0h 00m

£59

St. LouisChicago

STL Lambert-St Louis - ORD Chicago O'Hare Intl

STLORD

Lambert-St Louis

Wed 9/12

17:20-21:35

1 stop4h 15m

Chicago O'Hare Intl

Wed 31/12

00:00-00:00

Nonstop0h 00m

£59

St. LouisChicago

STL Lambert-St Louis - ORD Chicago O'Hare Intl

STLORD

Lambert-St Louis

Tue 5/1

10:57-16:27

1 stop5h 30m

Chicago O'Hare Intl

Wed 31/12

00:00-00:00

Nonstop0h 00m

£60

St. LouisChicago

STL Lambert-St Louis - ORD Chicago O'Hare Intl

STLORD

Lambert-St Louis

Tue 15/12

10:14-16:17

1 stop6h 03m

Chicago O'Hare Intl

Wed 31/12

00:00-00:00

Nonstop0h 00m

£60
Fastest return journey

St. LouisChicago

STL Lambert-St Louis - ORD Chicago O'Hare Intl

STLORD

Lambert-St Louis

Thu 18/2

13:08-14:35

Nonstop1h 27m

Chicago O'Hare Intl

Wed 31/12

00:00-00:00

Nonstop0h 00m

£63

St. LouisChicago

STL Lambert-St Louis - ORD Chicago O'Hare Intl

STLORD

Lambert-St Louis

Thu 18/2

06:30-12:44

1 stop6h 14m

Chicago O'Hare Intl

Wed 31/12

00:00-00:00

Nonstop0h 00m

£71

St. LouisChicago

STL Lambert-St Louis - ORD Chicago O'Hare Intl

STLORD

Lambert-St Louis

Mon 7/12

10:14-16:17

1 stop6h 03m

Chicago O'Hare Intl

Wed 31/12

00:00-00:00

Nonstop0h 00m

£78

St. LouisChicago

STL Lambert-St Louis - ORD Chicago O'Hare Intl

STLORD

Lambert-St Louis

Wed 24/2

06:30-12:44

1 stop6h 14m

Chicago O'Hare Intl

Wed 31/12

00:00-00:00

Nonstop0h 00m

£78

St. LouisChicago

STL Lambert-St Louis - ORD Chicago O'Hare Intl

STLORD

Lambert-St Louis

Thu 3/12

14:17-20:15

1 stop5h 58m

Chicago O'Hare Intl

Wed 31/12

00:00-00:00

Nonstop0h 00m

£78

Flights are sorted by cheapest return flights first.

Deals found on 7/11

Showing 1-10 of 21 resultsSorted by cheapest first
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Best time to book a flight from St. Louis to O'Hare Intl

Have a flexible travel schedule? Discover the best time to fly to O'Hare Intl from St. Louis with our price prediction graph.
Estimated return price

Cheapflights Insights

Everything you need to know about your flight from St. Louis to Chicago O'Hare Intl Airport

How far ahead should I book a flight from St. Louis to Chicago O'Hare Intl Airport?

The best time to book flights from St. Louis to Chicago O'Hare Intl Airport is 36 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

What is the cheapest month to book a flight from St. Louis to Chicago O'Hare Intl Airport?

Currently, December is the cheapest month in which you can book a flight from St. Louis to Chicago O'Hare Intl Airport (average of £208). Flying from St. Louis to Chicago O'Hare Intl Airport in January is currently the most expensive (average of £359). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from STL to ORD?

A simple way to save on the total cost of your ticket is to fly from St. Louis to Chicago O'Hare Intl Airport in the evening. If you’re flexible enough to do this you can expect to save up to 25% on your trip compared to booking a flight in the morning.

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

Travellers seeking maximum savings on their St. Louis to Chicago O'Hare Intl Airport flight should consider departing on Monday at midday when fares are most often at their lowest. Saturday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

How much does it cost for a return flight from St. Louis to Chicago O'Hare Intl Airport?

Airfare is below average for this route at the moment.

St. Louis to Chicago O'Hare Intl Airport flights typically cost between £208 and £340 in January.
The cheapest return price found within the last 5 days was £104 on United Airlines (5 Jan–20 Jan).

Related info for your journey

  • What airport do you fly from for flights from St. Louis to Chicago O'Hare Intl?

    For a flight from St. Louis to Chicago O'Hare Intl, you will be flying from Lambert-St Louis. Lambert-St Louis (STL) is just 12.7 mi from the center of the city. Lambert-St Louis is the only St. Louis airport and it handles 53 outbound flights to Chicago O'Hare Intl per day. 0 airlines have flights to Chicago O'Hare Intl from Lambert-St Louis on a regular basis.

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

    There are many flights that can get you from St. Louis to Chicago O'Hare Intl Airport in 4h 12m. Fly via Delta to get the fastest option. The distance between St. Louis and Chicago O'Hare Intl Airport is about 258 mi.

  • What are the most reliable airlines from St. Louis to Chicago O'Hare Intl Airport?

    Consider Japan Airlines (92%), Qatar Airways (89%) or Republic Airways (88%) when booking your flight. These represent the most reliable airlines when flying from St. Louis to Chicago O'Hare Intl Airport.

  • Can I find deals for flights from St. Louis to O'Hare Intl that include hotel bookings?

    Yes. In addition to deals on St. Louis to O'Hare Intl flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from St. Louis to O'Hare Intl?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from St. Louis to O'Hare Intl.

  • Can I find deals for business class flights from St. Louis to O'Hare Intl?

    Yes. Cheapflights offers flight deals from St. Louis to O'Hare Intl by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from St. Louis to Chicago O'Hare Intl Airport?

    Currently, December is the cheapest month in which you can book a flight from St. Louis to Chicago O'Hare Intl Airport (average of £208). Flying from St. Louis to Chicago O'Hare Intl Airport in January is currently the most expensive (average of £359). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Travelling to a place near Chicago O'Hare Intl Airport?

Book flights to Chicago O'Hare Intl Airport if you plan to visit one of these locations
Elk Grove Village

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