Filling Up on Gas Is Cheapest on Sundays in These 13 States
What’s going on with the price of gasoline? It’s a question drivers find themselves asking all too often (including right now) as gas prices continue to soar across the country. The spike in prices at the pump points to the ongoing war in Iran, which has largely choked off supply to the U.S.
The unpredictable and often unbelievably expensive cost of gas is a significant hurdle for Americans. With prices so high not only on gas but on other essentials, including food, many of us are forced to choose between filling our stomachs and filling our tanks.
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There’s only so much we can do to cut the cost of gas, and most budgeters know the tried and true ways to save, such as using the app Gasbuddy to find the cheapest gas stations in one’s area and taking advantage of any gas discounts that warehouse club memberships extend.
To maximize savings at the pump, it’s crucial to know which day of the week is the cheapest day in your state to buy fuel. A new study by Delancey Street analyzed daily gas price data from GasBuddy across all 50 states to find the cheapest day to fill up in each. Delancey Street researchers calculated the average price per gallon for every day of the week, then identified which day consistently delivered the lowest price.
Here are the 13 states where Sunday is the cheapest day to buy gas. The average price in these states is about $3.10 per gallon, according to Delancey Street’s analysis. For additional context, we included the average price per gallon for each fuel type in each state, based on AAA data from Thursday, June 11, 2026. States are listed in alphabetical order.
1. Alabama
Regular gas: $3.739
Mid-grade gas: $4.215
Premium gas: $4.593
Diesel gas: $4.894
2. Arizona
Regular gas: $4.484
Mid-grade gas: $4.852
Premium gas: $5.164
Diesel gas: $5.585
3. Arkansas
Regular gas: $3.745
Mid-grade gas: $4.232
Premium gas: $4.601
Diesel gas: $4.7940
4. California
Regular gas: $5.809
Mid-grade gas: $6.048
Premium gas: $6.230
Diesel gas: $7.098
5. Colorado
Regular gas: $4.206
Mid-grade gas: $4.597
Premium gas: $4.928
Diesel gas: $4.974
6. Connecticut
Regular gas: $4.293
Mid-grade gas: $4.882
Premium gas: $5.282
Diesel gas: $5.562
7. Delaware
Regular gas: $3.884
Mid-grade gas: $4.484
Premium gas: $4.789
Diesel gas: $5.012
8. Florida
Regular gas: $3.936
Mid-grade gas: $4.411
Premium gas: $4.747
Diesel gas: $4.993
9. Georgia
Regular gas: $3.793
Mid-grade gas: $4.257
Premium gas: $4.674
Diesel gas: $4.944
10. Idaho
Regular gas: $4.463
Mid-grade gas: $4.746
Premium gas: $5.024
Diesel gas: $5.301
11. Illinois
Regular gas: $4.448
Mid-grade gas: $5.040
Premium gas: $5.520
Diesel gas: $5.580
12. Indiana
Regular gas: $3.394
Mid-grade gas: $3.962
Premium gas: $4.477
Diesel gas: $5.579
13. Iowa
Regular gas: $3.756
Mid-grade gas: $4.087
Premium gas: $4.586
Diesel gas: $4.850
Why Is Gas Cheapest In These States on Sundays?
Delancey Street’s analysis didn’t dig into the driving forces behind the data or provide an explanation as to why Sunday is the cheapest day to buy gas in these 13 states. So why is this the case? It points to price-cycle timing, which gas stations use across the U.S. One local gas station will raise prices on its gas by about 20 or 30 cents per gallon, prompting others to raise prices on their supply.
Over the next few days, gas stations will gradually lower their prices by a few cents here and there to stay competitive.
It looks like in these 13 states, the price cycle reaches its weekly low on Sunday, making it the best day for local drivers to fill up the tank.
Methodology: This study analyzed daily gas price data for all 50 U.S. states to identify the cheapest day to fill up in each state. For each state, the average price per gallon was calculated for every day of the week, and the day consistently offering the lowest prices was determined.
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This article was provided by MoneyLion.com for informational purposes only and should not be construed as financial, legal or tax advice.
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