Our cheapest offers for flights from Denver to St. Louis

Here you can compare cheap flights from Denver (DEN) 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
Denver St. Louis	Outbound 06/25/26 1 Stopover (DFW) F92632, F91524 11h 55min	Return 06/30/26 1 Stopover (LAS) F92017, F94612 06h 33min	Frontier Airlines		$334
Best option Denver St. Louis	Outbound 06/25/26 direct UA1422 02h 09min	Return 06/30/26 direct UA1483 02h 35min	United Airlines		$429
Denver St. Louis	Outbound 07/26/26 1 Stopover (ATL) F93294, F94473 23h 47min	Return 08/05/26 direct F94567 02h 40min	Frontier Airlines	?	$363
Denver St. Louis	Outbound 06/25/26 1 Stopover (DFW) F92632, F91524 11h 55min	Return 06/30/26 1 Stopover (LAS) F92017, F94612 06h 33min	Frontier Airlines	?	$381
Denver St. Louis	Outbound 07/26/26 1 Stopover (ORD) UA1377, UA1355 05h 11min	Return 08/05/26 direct UA0362 02h 22min	United Airlines	?	$407
Denver St. Louis	Outbound 06/25/26 1 Stopover (DFW) F92632, F91524 11h 55min	Return 06/30/26 1 Stopover (LAS) F92017, F94612 06h 33min	Frontier Airlines		$410
Denver St. Louis	Outbound 07/26/26 1 Stopover (ATL) F91450, F94473 06h 48min	Return 08/05/26 direct F94567 02h 40min	Frontier Airlines		$414
Denver St. Louis	Outbound 07/26/26 1 Stopover (ORD) UA1377, UA1355 05h 11min	Return 08/05/26 direct UA2459 02h 23min	United Airlines	?	$432
Denver St. Louis	Outbound 06/25/26 direct UA1422 02h 09min	Return 06/30/26 1 Stopover (CLT) AA0712, AA1758 06h 36min	United Airlines	?	$433
Denver St. Louis	Outbound 07/26/26 1 Stopover (SEA) AS0643, AS0647 11h 34min	Return 08/05/26 direct F94567 02h 40min	Alaska Airlines	?	$566

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

Important flight information

Flight information: Denver - St. Louis

Roundtrip from	333,97 $
Flight duration	min. 01:50 / max. 07:30
Return flight duration	min. 02:20/ max. 11:15
Distance	1237 km
Flights per week	123
Departure airport	Airport Denver International Airport, CO (DEN)
Arrival airport	Airport St. Louis - Lambert International Airport (STL)
Destination country	Flights to United States

Alternative routes to United States

Flight Denver - Las Vegas from 149 $
Flight Denver - San Francisco from 219 $
Flight Denver - Miami from 237 $
Flight Denver - New York from 365 $
Flight Denver - Los Angeles from 205 $
Flight Denver - Seattle-Tacoma from 135 $
Flight Denver - Chicago from 143 $
Flight Denver - New York from 365 $
Flight Denver - Tampa from 317 $
Flight Denver - Dallas from 130 $

Alternative flights to St. Louis

Flight Atlanta - St. Louis from 173 $
Flight Chicago - St. Louis from 210 $
Flight Dallas - St. Louis from 277 $
Flight Boston - St. Louis from 478 $
Flight Philadelphia - St. Louis from 477 $
Flight Chicago O'Hare - St. Louis from 210 $

Flight Routes from Denver to St. Louis