PHOTO: Lambert International Airport in St. Louis, Missouri. (Photo via Flickr/JL Johnson)
Flights to St. Louis from Denver are on sale as noted by Airfare Watchdog.
DEAL: For those looking to travel to St. Louis in the spring, late summer or fall, Frontier Airlines is offering a deal on roundtrip flights from Denver for just $69. One way fares are just half that.
START DATE: Available now.
END DATE: Book soon before available seats run out.
DETAILS: Advanced purchase is required at least seven days before travel.
FOR MORE INFO: For more information on booking this fare and one-way pricing, read on here.