Fast food prices in O Fallon, MO
Prices at 9 fast food restaurants in O Fallon, MO.
9 restaurants, prices as of . See O Fallon on the map
Key findings
- A McDonald's Big Mac typically costs $5.24 in O Fallon, MO ($4.99 to $6.29 across 6 restaurants). McDonald's here is 4% below its typical price in the US.
- A Burger King Whopper typically costs $6.19 in O Fallon, MO ($6.19 across 1 restaurants). Burger King here is not enough restaurants to compare.
- A Taco Bell Crunchwrap Supreme typically costs $6.39 in O Fallon, MO ($6.39 across 1 restaurants). Taco Bell here is not enough restaurants to compare.
- A Chick-fil-A Chicken Sandwich typically costs $5.39 in O Fallon, MO ($5.39 across 1 restaurants). Chick-fil-A here is not enough restaurants to compare.
Every brand in O Fallon
| Brand | Restaurants | Typical price | Range | Index | Cheapest restaurant |
|---|---|---|---|---|---|
| McDonald's | 6 | Big Mac: $5.24 | $4.99 to $6.29 | 96 | 4001 Crusher Dr |
| Burger King | 1 | Whopper: $6.19 | $6.19 to $6.19 | — | — |
| Taco Bell | 1 | Crunchwrap Supreme: $6.39 | $6.39 to $6.39 | — | — |
| Chick-fil-A | 1 | Chicken Sandwich: $5.39 | $5.39 to $5.39 | — | — |
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 | 4001 Crusher Dr $5.29 Big Mac | 2915 Highway K $6.29 Big Mac | 7% |
Every restaurant in O Fallon, MO
Each restaurant links to its full menu with prices.
McDonald's
| Restaurant | Big Mac | Basket index | Price level (US) |
|---|---|---|---|
| 4001 Crusher Dr | $5.29 | 92 | $$$$$ |
| 2144 W Terra Ln | $4.99 | 94 | $$$$$ |
| 101 Mcdonald Ln | $5.19 | 95 | $$$$$ |
| 1001 N Main St | $4.99 | 96 | $$$$$ |
| 962 Bryan Rd | $5.29 | 97 | $$$$$ |
| 2915 Highway K | $6.29 | 99 | $$$$$ |
Burger King
| Restaurant | Whopper | Basket index | Price level (US) |
|---|---|---|---|
| 2882 Highway K | $6.19 | 101 | $$$$$ |
Taco Bell
| Restaurant | Crunchwrap Supreme | Basket index | Price level (US) |
|---|---|---|---|
| 4231 State Highway K | $6.39 | 98 | $$$$$ |
Chick-fil-A
| Restaurant | Chicken Sandwich | Basket index | Price level (US) |
|---|---|---|---|
| 2106 Highway K | $5.39 | 102 | $$$$$ |
Nearby in Missouri
- Kansas City
- Saint Louis
- Springfield
- Independence
- Columbia
- Joplin
- Lees Summit
- Saint Peters
- Branson
- Cape Girardeau
- Blue Springs
- Jefferson City
Questions people ask
- How much is a McDonald's Big Mac in O Fallon, MO?
- As of 2026-09-30, a Big Mac costs $4.99 to $6.29 at 6 McDonald's restaurants in O Fallon, MO, typically $5.24.
- Where is the cheapest McDonald's in O Fallon, MO?
- The cheapest McDonald's in O Fallon, MO is at 4001 Crusher Dr, O Fallon, comparing the same basket at 6 restaurants (Drive Thru Index, 2026-09-30).
- How much is a Burger King Whopper in O Fallon, MO?
- As of 2026-09-30, a Whopper costs $6.19 at 1 Burger King restaurants in O Fallon, MO, typically $6.19.
- How much is a Taco Bell Crunchwrap Supreme in O Fallon, MO?
- As of 2026-09-30, a Crunchwrap Supreme costs $6.39 at 1 Taco Bell restaurants in O Fallon, MO, typically $6.39.
- How much is a Chick-fil-A Chicken Sandwich in O Fallon, MO?
- As of 2026-09-30, a Chicken Sandwich costs $5.39 at 1 Chick-fil-A restaurants in O Fallon, MO, typically $5.39.
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/missouri/o-fallon), prices checked 2026-09-30. You are welcome to quote any figure on this page.