Costco Gas Prices in San Antonio, TX
- Regular avg
- $3.539▼ −$0.045
- Premium avg
- $4.159▼ −$0.055
- Stations reporting
- 2
Avg of 2 stations · per gallon · ▲▼ change since the previous day
Price history in San Antonio
Last 30 days · per gallonView data as table
| Date | Regular | Premium |
|---|---|---|
| Sep 1 | $3.289 | $3.879 |
| Sep 2 | $3.289 | $3.879 |
| Sep 3 | $3.339 | $3.939 |
| Sep 4 | $3.389 | $3.989 |
| Sep 5 | $3.389 | $4.014 |
| Sep 6 | $3.389 | $4.014 |
| Sep 7 | $3.444 | $4.079 |
| Sep 8 | $3.444 | $4.079 |
| Sep 9 | $3.444 | $4.079 |
| Sep 10 | $3.469 | $4.104 |
| Sep 11 | $3.634 | $4.349 |
| Sep 12 | $3.664 | $4.399 |
| Sep 13 | $3.694 | $4.399 |
| Sep 14 | $3.724 | $4.354 |
| Sep 15 | $3.739 | $4.324 |
| Sep 16 | $3.599 | $4.289 |
| Sep 17 | $3.674 | $4.274 |
| Sep 18 | — | — |
| Sep 19 | $3.699 | $4.299 |
| Sep 20 | $3.689 | $4.299 |
| Sep 21 | $3.699 | $4.299 |
| Sep 22 | $3.699 | $4.299 |
| Sep 23 | $3.689 | $4.289 |
| Sep 24 | $3.639 | $4.269 |
| Sep 25 | $3.619 | $4.259 |
| Sep 26 | $3.599 | $4.219 |
| Sep 27 | $3.624 | $4.209 |
| Sep 28 | $3.624 | $4.254 |
| Sep 29 | $3.584 | $4.214 |
| Sep 30 | $3.539 | $4.159 |
Costco gas in San Antonio today
San Antonio has 2 Costco gas stations: NW San Antonio at 5611 Utsa Blvd and W San Antonio at 191 W Loop 1604 S.
Today’s Regular prices span $0.020 across the 2 stations reporting, from the cheapest to the most expensive.
Costco Regular prices in San Antonio have climbed about $0.250 over the past month, from $3.289 a month ago.
The furthest any single station moved was NW San Antonio, up $0.250.
- Cheapest today
- W San Antonio — $3.529
- Most expensive today
- NW San Antonio — $3.549
- vs the Texas average
- $0.080 below, at $3.619
- Diesel
- sold at none of the 2 stations
Costco gas stations in San Antonio
Fuel grades at Costco in San Antonio
All 2 Costco gas stations in San Antonio 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 | $3.539 | W San Antonio $3.529 |
| Premium | 2 | $4.159 | W San Antonio $4.059 |
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 San Antonio good quality?
Costco does not sell a refiner’s brand. Every pump in San Antonio 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 San Antonio
On weekdays the earliest pumps in San Antonio come on at 6 a.m. (NW San Antonio) and the last ones switch off at 10 p.m. (NW San Antonio). Pump hours run longer than the warehouse's, and weekends are shorter. Times are local.
| Station | Mon–Fri | Sat | Sun |
|---|---|---|---|
| NW San Antonio | 6 a.m. – 10 p.m. | 6 a.m. – 8:30 p.m. | 6 a.m. – 7:30 p.m. |
| W San Antonio | 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 San Antonio
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 San Antonio
Bring your card. The pump asks for an active Costco membership card before it starts, at all 2 gas stations in San Antonio. 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 San Antonio can differ. Today the regular average here is $3.539. 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 San Antonio
Costco gas in San Antonio is in 2 ZIP codes. Each links to the station there.
- Costco gas 78245 · W San Antonio
- Costco gas 78249 · NW San Antonio
Cities near San Antonio
- Costco gas prices Selma · TX · 21 mi$3.529
- Costco gas prices New Braunfels · TX · 40 mi$3.499
- Costco gas prices Kyle · TX · 60 mi$3.589
- Costco gas prices Austin · TX · 82 mi$3.559
- Costco gas prices Cedar Park · TX · 87 mi$3.579
- Costco gas prices Liberty Hill · TX · 92 mi$3.649
- Costco gas prices Pflugerville · TX · 92 mi$3.529
- Costco gas prices Georgetown · TX · 100 mi$3.649
States near Texas
- Costco gas prices Oklahoma · 4 stations$3.862
- Costco gas prices Arkansas · 1 station$3.849
- Costco gas prices Louisiana · 4 stations$3.776
- Costco gas prices Mississippi · 1 station$3.789
Costco gas in San Antonio: common questions
Where is the cheapest Costco gas in San Antonio today?
W San Antonio posts the lowest Regular price in San Antonio, $3.529 as of the September 30, 2026 reading — $0.020 under NW San Antonio, the most expensive of the 2 stations reporting.
How many Costco gas stations are there in San Antonio?
San Antonio 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 San Antonio sell diesel?
No — none of the 2 stations in San Antonio 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 San Antonio than in Texas?
Yes — the San Antonio Costco average for Regular is $3.539, $0.080 below the Texas average of $3.619 as of the September 30, 2026 reading.
Are Costco gas prices in San Antonio going up or down?
Up — the San Antonio Costco average for Regular has climbed about $0.250 over the past month, from $3.289 to $3.539.