Gas Prices in St. Louis, MO
Updated May 21, 2026 · AAA data · Regular unleaded
Gas Prices in St. Louis
St. Louis gas prices are moderated by Missouri's moderate tax structure and QuikTrip's aggressive St. Louis-area pricing. The Illinois side (East St. Louis, Belleville) pays dramatically more due to Illinois's 66¢ tax, making Missouri-side stations popular with Illinois commuters crossing the river.
Prices at individual stations can vary by 5–15 cents within the same city depending on brand, location, and local competition. Use apps like GasBuddy to find the cheapest station near you in St. Louis.
Frequently Asked Questions
What is the gas price in St. Louis right now?
The average regular unleaded price in St. Louis, Missouri is $4.230/gal as of May 21, 2026. Station prices vary — expect a range of roughly $4.130 to $4.350 across the metro area.
Do Illinois residents fill up on the Missouri side in St. Louis?
Absolutely — the tax differential between Missouri (22¢) and Illinois (66¢) means Missouri-side stations are 30-40¢ cheaper. Residents of East St. Louis, Fairview Heights, and Belleville routinely cross the bridges to fill up in Missouri, particularly near the I-270 and I-64 crossing points.
Where is cheapest gas in St. Louis MO?
QuikTrip is the strongest everyday chain throughout the metro. Phillips 66 branded independents often compete closely. Costco in Ballwin, Chesterfield, and South St. Louis County offers excellent prices for members. Gas in Florissant and Hazelwood in North County often runs below Clayton and Central Corridor prices.
When is the cheapest day to buy gas in St. Louis?
Nationwide data shows Monday and Tuesday tend to have slightly lower gas prices before weekly demand picks up. Avoid buying gas Thursday through Saturday when prices are typically higher.