Which airline flies the most flights to STL? The top airline carrier flying out of Lambert St. Louis Intl. is Southwest Airlines and they fly over 2,218 flights every month. What are the cheapest flights from STL? St. Louis has a lot of discount flights in the month of February. Check out these great deals on flights from STL:
- American Airlines - St. Louis (STL) to Vienna (VIE) leaving on 2/24 at 5:27 pm and returning on 2/26 at 7:59 pm for only $1,434 per person.*
- Frontier Airlines - St. Louis (STL) to Las Vegas (LAS) on 2/27 leaving at 2:55 pm and returning on 3/2 at 3:06 am for only $87 per person.*
- Cape Air - St. Louis (STL) to Chicago (ORD) on 3/2 leaving at 7:48 am and returning on 3/4 at 11:08 am for only $146 per person.*
- Frontier Airlines - St. Louis (STL) to Denver (DEN) on 3/7 leaving at 4:54 pm and returning on 3/8 at 9:13 am for only $147 per person.*
*Prices vary and will be updated when you view current flight availability results. Deals displayed here are based on flight pricing and availability as of 02/21/2018 and may change as you get closer to the actual flight date. Deals displayed whose dates are in the past are no longer valid.