Fast food prices in O Fallon, IL
O Fallon, IL is the 86th cheapest of 86 Illinois cities we track for fast food (Drive Thru Index 110, 10% above the national typical price).
7 restaurants, prices as of . See O Fallon on the map
Key findings
- A McDonald's Big Mac typically costs $5.79 in O Fallon, IL ($5.79 across 2 restaurants). McDonald's here is 3% below its typical price in the US.
- A Burger King Whopper typically costs $6.19 in O Fallon, IL ($6.19 across 1 restaurants). Burger King here is not enough restaurants to compare.
- A Dunkin' Medium Original Blend typically costs $3.59 in O Fallon, IL ($3.59 across 1 restaurants). Dunkin' here is not enough restaurants to compare.
- A Jack in the Box Jumbo Jack typically costs $5.79 in O Fallon, IL ($5.79 across 1 restaurants). Jack in the Box here is not enough restaurants to compare.
Every brand in O Fallon
| Brand | Restaurants | Typical price | Range | Index | Cheapest restaurant |
|---|---|---|---|---|---|
| McDonald's | 2 | Big Mac: $5.79 | $5.79 to $5.79 | 97 | 109 E Highway 50 |
| Burger King | 1 | Whopper: $6.19 | $6.19 to $6.19 | — | — |
| Dunkin' | 1 | Medium Original Blend: $3.59 | $3.59 to $3.59 | — | — |
| Jack in the Box | 1 | Jumbo Jack: $5.79 | $5.79 to $5.79 | — | — |
| Hardee's | 2 | Bacon Egg & Cheese Biscuit: — | — to — | 123 | 124 Hartman Ln |
Price history
Drive Thru Index has recorded these prices every day since 2 October 2026. Each figure is the typical (median) price across the brand's restaurants here on that day. Comparisons with earlier dates appear here as the daily record builds up.
| Brand | Item | Today | 7 days ago | 30 days ago | 1 year ago | Trend |
|---|---|---|---|---|---|---|
| McDonald's | Big Mac | $5.79 | — | — | — | |
| Burger King | Whopper | $6.19 | — | — | — | |
| Dunkin' | Medium Original Blend | $3.59 | — | — | — | |
| Jack in the Box | Jumbo Jack | $5.79 | — | — | — |
Cheapest and priciest restaurant of each brand
Compared on the same basket of items at each restaurant of the brand. The gap is how much more the priciest charges for that basket.
| Brand | Cheapest | Priciest | Gap |
|---|---|---|---|
| McDonald's | 109 E Highway 50 $5.79 Big Mac | 1610 W Highway 50 $5.79 Big Mac | 0% |
| Hardee's | 124 Hartman Ln — Bacon Egg & Cheese Biscuit | 124 Hartman Ln — Bacon Egg & Cheese Biscuit | 0% |
Every restaurant in O Fallon, IL
Each restaurant links to its full menu with prices.
McDonald's
| Restaurant | Big Mac | Basket index | Price level (national) |
|---|---|---|---|
| 109 E Highway 50 | $5.79 | 97 | $$$$$ |
| 1610 W Highway 50 | $5.79 | 97 | $$$$$ |
Burger King
| Restaurant | Whopper | Basket index | Price level (national) |
|---|---|---|---|
| 1751 Frank Scott Pkwy E | $6.19 | 101 | $$$$$ |
Dunkin'
| Restaurant | Medium Original Blend | Basket index | Price level (national) |
|---|---|---|---|
| 1755 Frank Scott Parkway East Lot 3B | $3.59 | 114 | $$$$$ |
Jack in the Box
| Restaurant | Jumbo Jack | Basket index | Price level (national) |
|---|---|---|---|
| 1360 W Us Highway 50 | $5.79 | 99 | $$$$$ |
Hardee's
| Restaurant | Bacon Egg & Cheese Biscuit | Basket index | Price level (national) |
|---|---|---|---|
| 124 Hartman Ln | — | 123 | $$$$$ |
| 110 East Highway 50 | — | 123 | $$$$$ |
Nearby in Illinois
Questions people ask
- How much is a McDonald's Big Mac in O Fallon, IL?
- As of 2026-10-03, a Big Mac costs $5.79 at 2 McDonald's restaurants in O Fallon, IL, typically $5.79.
- How much is a Burger King Whopper in O Fallon, IL?
- As of 2026-10-03, a Whopper costs $6.19 at 1 Burger King restaurants in O Fallon, IL, typically $6.19.
- How much is a Dunkin' Medium Original Blend in O Fallon, IL?
- As of 2026-10-03, a Medium Original Blend costs $3.59 at 1 Dunkin' restaurants in O Fallon, IL, typically $3.59.
- How much is a Jack in the Box Jumbo Jack in O Fallon, IL?
- As of 2026-10-03, a Jumbo Jack costs $5.79 at 1 Jack in the Box restaurants in O Fallon, IL, typically $5.79.
How these prices are measured
Every day we check the menu at every restaurant of each chain, through the same ordering app its customers use, and record each item's pickup price. Restaurants are compared on a basket of items every full-menu restaurant of that brand sells. An index of 100 is the brand's typical (median) restaurant in the country, so 95 means 5% cheaper and 110 means 10% pricier. Brands are only ever compared with themselves, never with each other.
Citing this data: Source: Drive Thru Index (https://drivethruindex.com/prices/illinois/o-fallon), prices checked 2026-10-03. You are welcome to quote any figure on this page.