Our cheapest offers for flights from Chicago to St. Louis

Here you can compare cheap flights from Chicago (CHI) to St. Louis (STL) for one-way or return trips. The following offers were searched for and found on idealo during the last few days. Or start your own flight search to St. Louis. Prices and availability may change at any time.

	Outbound	Return	Airlines	Baggage	Price
Chicago St. Louis	Outbound 09/25/25 direct AA2514 01h 14min	Return 10/05/25 1 Stopover (UIN) 9X0464, 9X0485 03h 24min	American Airlines	?	$140
Best option Chicago St. Louis	Outbound 11/09/25 direct UA2618 01h 26min	Return 12/07/25 direct UA1641 01h 23min	United Airlines	?	$192
Chicago St. Louis	Outbound 09/25/25 1 Stopover (UIN) 9X0482, 9X0465 03h 45min	Return 10/05/25 1 Stopover (UIN) 9X0464, 9X0485 03h 24min	Southern Airways Express		$182
Chicago St. Louis Pay attention to transfer at connecting flight	Outbound 11/09/25 2 Stopovers (BNA, JBR) NK0416, 9X0459, 9X0454 26h 35min	Return 12/07/25 1 Stopover (FLL) NK2158, NK1986 21h 03min	Spirit Airlines, Southern Airways Express		$281
Chicago St. Louis	Outbound 09/25/25 1 Stopover (ATL) F91596, F94473 09h 54min	Return 10/05/25 1 Stopover (DEN) F94567, F93172 28h 04min	Frontier Airlines	?	$153
Chicago St. Louis	Outbound 09/25/25 1 Stopover (ATL) F91596, F94473 09h 54min	Return 10/05/25 1 Stopover (DEN) F94567, F93174 13h 42min	Frontier Airlines		$154
Chicago St. Louis	Outbound 09/25/25 1 Stopover (UIN) 9X0482, 9X0465 03h 45min	Return 10/05/25 1 Stopover (UIN) 9X0464, 9X0485 03h 24min	Southern Airways Express	?	$167
Chicago St. Louis	Outbound 09/25/25 1 Stopover (ATL) F91596, F94473 09h 54min	Return 10/05/25 1 Stopover (UIN) 9X0464, 9X0485 03h 24min	Frontier Airlines		$179
Chicago St. Louis	Outbound 09/25/25 1 Stopover (UIN) 9X0482, 9X0465 03h 45min	Return 10/05/25 1 Stopover (UIN) 9X0464, 9X0485 03h 24min	Southern Airways Express		$195
Chicago St. Louis	Outbound 11/09/25 direct UA4416 01h 34min	Return 12/07/25 direct UA3598 01h 30min	United Airlines		$201

Tips and tricks to help you find cheap flights from Chicago to St. Louis

Important flight information

Flight information: Chicago - St. Louis

Roundtrip from	$139.42
Flight duration	min. 01:05 / max. 08:55
Return flight duration	min. 01:00/ max. 12:10
Distance	419 km
Flights per week	203
Departure airport	Airport Chicago-IL, all airports (CHI)
Arrival airport	Airport St. Louis - Lambert International Airport (STL)
Destination country	Flights to United States

Alternative routes to United States

Flight Chicago - New York from $106
Flight Chicago - Las Vegas from $110
Flight Chicago - Los Angeles from $91
Flight Chicago - Miami from $98
Flight Chicago - San Francisco from $156
Flight Chicago - Tampa from $56
Flight Chicago - Denver from $101
Flight Chicago - Orlando from $130
Flight Chicago - New Orleans from $103
Flight Chicago - Boston from $195

Alternative flights to St. Louis

Flight Atlanta - St. Louis from $110
Flight Denver - St. Louis from $135
Flight Boston - St. Louis from $298
Flight Dallas - St. Louis from $121
Flight Chicago O'Hare - St. Louis from $140

Flights from Chicago to St. Louis