Cheapest Gas in St. Louis, MO
Updated April 5, 2026 — Prices updated regularly from EIA data
$2.76
Lowest price at Costco in St. Louis
Finding Cheap Gas in St. Louis
The cheapest gas in St. Louis right now comes from warehouse clubs and high-volume discount stations. With prices as low as $$2.76 versus a metro average of $$2.91, smart shoppers find real savings consistently.
Maximum Savings in St. Louis
Choose Costco over Chevron
$0.25 per gallon
$3.75 per 15-gallon fill • $12.00 per year (est.)
Cheapest Brands in St. Louis
| Rank | Brand | Est. Price | Savings vs. Most Expensive |
|---|---|---|---|
| #1 | Costco | $2.76 | $0.25 |
| #2 | Speedway | $2.88 | $0.13 |
| #3 | Circle K | $2.89 | $0.12 |
| #4 | Sunoco | $2.92 | $0.09 |
| #5 | Marathon | $2.93 | $0.08 |
| #6 | BP | $2.95 | $0.06 |
| #7 | Mobil | $2.96 | $0.05 |
| #8 | Exxon | $2.97 | $0.04 |
| #9 | Shell | $2.99 | $0.02 |
| #10 | Chevron | $3.01 | $0.00 |
Gas Saving Tips for St. Louis Drivers
- Accelerate and brake gradually. Aggressive driving can reduce fuel economy by 15-40%, directly increasing how often you fill up.
- Track weekly price cycles in your city — most markets follow predictable weekly patterns. Identifying yours and filling on low-price days saves 5-15 cents per gallon consistently.
- Fill up before holiday weekends. Memorial Day, Fourth of July, and Labor Day consistently see 10-25 cent price spikes as demand surges. Topping off Thursday before a holiday weekend beats the rush.
- Download the Upside app for cashback on gas purchases — users report average savings of 20-30 cents per gallon on qualifying transactions.
- Check if your grocery store offers fuel rewards. Kroger, Safeway, Giant, and many regional chains discount gas by 10-50 cents per gallon tied to grocery spending thresholds.
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