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
Best option Denver St. Louis	Outbound 05/16/26 direct F93302 02h 12min	Return 05/29/26 direct UA0756 02h 35min	Frontier Airlines	?	$280
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
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 05/16/26 direct UA1293 02h 09min	Return 05/29/26 direct UA0362 02h 22min	United Airlines	?	$412
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

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

Important flight information

Flight information: Denver - St. Louis

Roundtrip from	$ 279,20
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 $ 209
Flight Denver - Los Angeles from $ 191
Flight Denver - Seattle-Tacoma from $ 199
Flight Denver - Chicago from $ 143
Flight Denver - New York from $ 209
Flight Denver - Tampa from $ 317
Flight Denver - Dallas from $ 130

Alternative flights to St. Louis

Flight Atlanta - St. Louis from $ 90
Flight Chicago - St. Louis from $ 210
Flight Boston - St. Louis from $ 222
Flight Dallas - St. Louis from $ 270
Flight Philadelphia - St. Louis from $ 477
Flight Chicago O'Hare - St. Louis from $ 210

Flight Routes from Denver to St. Louis