Home >> Fares From A City >> Denver, CO >> Denver, CO (DEN) To St. Louis, MO (STL)
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    Mon, July 25, 2016
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    Wed, November 16, 2016
Peter T.
Staff Airfare Analyst
Peter's Notes:
30% Off Promo Code Fare; Late Summer/Fall travel. No min. stay. Fare can be bought one-way for half the lowest roundtrip price.
Book this fare on FlyFrontier.com using promo code SAVE30 for Tue/Wed/Sat travel between Aug. 3 - Nov 16, 2016. Blackout dates apply: Oct. 8, 11, & 12, 2016.

This is the lowest fare found within the promo code travel period and may not be available throughout the entire travel period or on a daily basis. Some routes are seasonal and may not operate through the entire travel period. Lower fares may be available for Frontier Discount Den members.

Promo code takes 30% off the base fare only and does not apply to taxes/fees. This promo code expires at 11:59 p.m. ET on Jul. 25, 2016.

Frontier charges a $30-$35 fee each way for carry-on bags larger than 18x14x8 inches and a $25-$30 fee each way for first checked bag no larger than 62 linear inches (length + width + depth) and no heavier than 50 pounds. These bag fees apply to online purchases before check-in. Higher fees apply at the airport.

During booking on FlyFrontier.com, you can purchase "The Works", which includes one checked bag, one carry-on bag, stretch seating, no change fees, and refundability, for much less than purchasing these items separately.
Seats are not available on all flights or all dates of travel. You may need to have flexible travel dates to find this fare. Fares for travel on holidays may be higher.
All mandatory taxes/fees are included in the price. Tax-inclusive fare may be a few dollars higher or lower depending on the airport you connect through, if any. Baggage fees, if applicable, and other optional fees are not included. Our Dealhounds found this airfare using flexible date search. This means we searched a range of dates to find you the best price.
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Reviews for Denver to St. Louis
4 Traveler Reviews
"American Airlines champion customer service"
Flight from Denver to St. Louis
Airline: American
RT/OW: roundtrip
Number of Stops: 1 stop in DFW
Date of Flight: February 2011
Seat Class: economy
Check-in Experience
In-flight Service
Seat Comfort
it has been many years since I enjoyed a trip on an airline as this trip on American Airlines. The esprit d'corps among the staff to provide quality service, especially during weather related delays, was refreshing and appreciated. This is what flying used to be about when the experience was grand and pleasurable. I will choose to fly American whenever I can.
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There are approximately 270 flights covering the route from Denver International Airport in Denver to Lambert-St. Louis International Airport in , provided by as many as 8 airlines.
The following airlines often offer cheap flights from Denver to
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