Costco Gas Prices in Saint Louis, MO
- Regular avg
- $3.949▼ −$0.040
- Premium avg
- $4.604▲ +$0.005
- Stations reporting
- 2
Avg of 2 stations · per gallon · ▲▼ change since the previous day
Price history in Saint Louis
Last 30 days · per gallonView data as table
| Date | Regular | Premium |
|---|---|---|
| Sep 1 | $3.689 | $4.299 |
| Sep 2 | $3.689 | $4.299 |
| Sep 3 | $3.689 | $4.299 |
| Sep 4 | $3.689 | $4.299 |
| Sep 5 | $3.689 | $4.329 |
| Sep 6 | $3.719 | $4.379 |
| Sep 7 | $3.764 | $4.424 |
| Sep 8 | $3.764 | $4.424 |
| Sep 9 | $3.789 | $4.479 |
| Sep 10 | $3.849 | $4.504 |
| Sep 11 | $3.849 | $4.504 |
| Sep 12 | $3.849 | $4.504 |
| Sep 13 | $3.849 | $4.504 |
| Sep 14 | $3.849 | $4.474 |
| Sep 15 | $3.849 | $4.474 |
| Sep 16 | $3.869 | $4.474 |
| Sep 17 | $3.884 | $4.524 |
| Sep 18 | — | — |
| Sep 19 | $3.949 | $4.549 |
| Sep 20 | $3.949 | $4.549 |
| Sep 21 | $3.934 | $4.549 |
| Sep 22 | $3.939 | $4.524 |
| Sep 23 | $3.909 | $4.524 |
| Sep 24 | $3.909 | $4.524 |
| Sep 25 | $3.909 | $4.524 |
| Sep 26 | $3.909 | $4.524 |
| Sep 27 | $3.909 | $4.524 |
| Sep 28 | $3.964 | $4.579 |
| Sep 29 | $3.989 | $4.599 |
| Sep 30 | $3.949 | $4.604 |
Costco gas in Saint Louis today
Saint Louis has 2 Costco gas stations: S St Louis at 4200 Rusty Rd and University City at 8685 Olive Blvd.
Today’s Regular prices span $0.100 across the 2 stations reporting, from the cheapest to the most expensive.
Costco Regular prices in Saint Louis have climbed about $0.260 over the past month, from $3.689 a month ago.
The furthest any single station moved was S St Louis, up $0.300.
- Cheapest today
- University City — $3.899
- Most expensive today
- S St Louis — $3.999
- vs the Missouri average
- $0.021 above, at $3.928
- Diesel
- sold at none of the 2 stations
Costco gas stations in Saint Louis
Fuel grades at Costco in Saint Louis
All 2 Costco gas stations in Saint Louis sell Kirkland Signature fuel, which is Top Tier certified. None of them reported a diesel price in the last 30 days.
| Grade | Stations | Avg today | Cheapest |
|---|---|---|---|
| Regular | 2 | $3.949 | University City $3.899 |
| Premium | 2 | $4.604 | University City $4.559 |
Regular
all 2 stations87-octane Kirkland Signature unleaded, the grade most cars are built for.
- Same TOP TIER detergent package as premium. The only difference between the two is octane.
- Can contain up to 10% ethanol, like most US gasoline. The pump label shows the blend.
Premium
all 2 stationsKirkland Signature premium: 91 octane at most stations, 93 in some regions.
- Only needed if your owner’s manual requires or recommends premium. Higher octane resists engine knock; it adds nothing to an engine built for regular.
- Carries the same detergent additives as regular.
Not sold at Costco
- Mid-grade (89): Costco pumps offer regular and premium only.
- Cash sales: every Costco pump is card-only.
Is Costco gas in Saint Louis good quality?
Costco does not sell a refiner’s brand. Every pump in Saint Louis dispenses Costco’s own Kirkland Signature fuel, bought from major refiners and distributors in the region and finished with Costco’s additive package.
Kirkland Signature gasoline is licensed TOP TIER, the detergent standard set by automakers including GM, Ford, Toyota, Honda and BMW. Costco puts its detergent level at about five times the EPA minimum, which is what keeps intake valves and fuel injectors clear of carbon deposits. Costco’s gasoline also contains friction modifiers that it says reduce engine wear.
In short, the low price is not a lower grade. The saving comes from Costco running its gas as a membership perk on thin margins, not from the fuel.
Costco gas station hours in Saint Louis
On weekdays the earliest pumps in Saint Louis come on at 6 a.m. (S St Louis) and the last ones switch off at 10 p.m. (S St Louis). Pump hours run longer than the warehouse's, and weekends are shorter. Times are local.
| Station | Mon–Fri | Sat | Sun |
|---|---|---|---|
| S St Louis | 6 a.m. – 10 p.m. | 6 a.m. – 8:30 p.m. | 6 a.m. – 7:30 p.m. |
| University City | 6 a.m. – 10 p.m. | 6 a.m. – 8:30 p.m. | 6 a.m. – 7:30 p.m. |
What else is at Costco warehouses in Saint Louis
Every Costco gas station sits in a warehouse parking lot, so a fill-up can share a trip with the rest of the list.
- Food court
- 2 of 2
- Pharmacy
- 2 of 2
- Optical
- 2 of 2
- Tire center
- 2 of 2
- Car wash
- 0 of 2
- EV charging
- 0 of 2
How Costco gas works in Saint Louis
Bring your card. The pump asks for an active Costco membership card before it starts, at all 2 gas stations in Saint Louis. Without a membership, a Costco Shop Card loaded with credit works the same way.
Pay by card. The pumps take Visa, most debit cards and the Costco Shop Card. There is no cash, and a card hold of up to $150 can show until the fill posts.
Check the price first. Each station sets its own price, usually once a day, so two Costco stations in Saint Louis can differ. Today the regular average here is $3.949. The prices on this page are collected once daily and can lag a same-day change at the pump.
Go early or late. Lines are longest on weekend afternoons and weekday evenings. The first pumps here open at 6 a.m. on weekdays.
ZIP codes with Costco gas in Saint Louis
Costco gas in Saint Louis is in 2 ZIP codes. Each links to the station there.
- Costco gas 63128 · S St Louis
- Costco gas 63132 · University City
Cities near Saint Louis
- Costco gas prices St. Louis · MO · 8 mi$3.879
- Costco gas prices Manchester · MO · 9 mi$3.899
- Costco gas prices Saint Peters · MO · 20 mi$3.899
- Costco gas prices East Peoria · IL · 149 mi$4.569
States near Missouri
- Costco gas prices Kansas · 3 stations$4.052
- Costco gas prices Iowa · 4 stations$3.994
- Costco gas prices Arkansas · 1 station$3.849
- Costco gas prices Nebraska · 4 stations$4.117
Costco gas in Saint Louis: common questions
Where is the cheapest Costco gas in Saint Louis today?
University City posts the lowest Regular price in Saint Louis, $3.899 as of the September 30, 2026 reading — $0.100 under S St Louis, the most expensive of the 2 stations reporting.
How many Costco gas stations are there in Saint Louis?
Saint Louis has 2 Costco warehouses with a gas station, and all of them reported a price in the last 30 days.
Does any Costco gas station in Saint Louis sell diesel?
No — none of the 2 stations in Saint Louis has reported a diesel price in the last 30 days. Costco sells diesel at a minority of its locations in the US.
Is Costco gas cheaper in Saint Louis than in Missouri?
No — the Saint Louis Costco average for Regular is $3.949, $0.021 above the Missouri average of $3.928 as of the September 30, 2026 reading.
Are Costco gas prices in Saint Louis going up or down?
Up — the Saint Louis Costco average for Regular has climbed about $0.260 over the past month, from $3.689 to $3.949.