McDonald's Menu in O'Fallon, IL — Prices 2026

1 location · 21 menu items tracked · App-sourced prices · Updated October 2026

$5.79 Big Mac avg
$5.79 Min price
$5.79 Max price
$5.91 National avg

McDonald's Locations in O'Fallon

McDonald's Prices in O'Fallon

McDonald's in O'Fallon, IL averages $5.79 for a Big Mac, ranging from $5.79 to $5.79 across 1 locations. The US national average is $5.91.

Price Breakdown — All Items in O'Fallon

20 Pc. Chicken McNuggets
$7.89
State avg: $8.51
$0.62 below state avg

20 Pc. Chicken McNuggets in O'Fallon averages $7.89. The state average is $8.51.

Big Arch
$8.59
State avg: $8.61
$0.02 below state avg

Big Arch in O'Fallon averages $8.59. The state average is $8.61.

Big Arch Large Meal
$12.69
State avg: $12.68
$0.01 above state avg

Big Arch Large Meal in O'Fallon averages $12.69. The state average is $12.68.

Big Arch Meal
$11.99
State avg: $11.94
$0.05 above state avg

Big Arch Meal in O'Fallon averages $11.99. The state average is $11.94.

Big Mac
$5.79
State avg: $5.87
$0.08 below state avg

Big Mac in O'Fallon averages $5.79. The state average is $5.87.

Big Mac Large Meal
$9.69
State avg: $10.04
$0.35 below state avg

Big Mac Large Meal in O'Fallon averages $9.69. The state average is $10.04.

Big Mac Meal
$9.14
State avg: $9.1
$0.04 above state avg

Big Mac Meal in O'Fallon averages $9.14. The state average is $9.1.

Cheeseburger
$2.49
State avg: $2.51
$0.02 below state avg

Cheeseburger in O'Fallon averages $2.49. The state average is $2.51.

Derpy McFlurry
$4.79
State avg: $5.5
$0.71 below state avg

Derpy McFlurry in O'Fallon averages $4.79. The state average is $5.5.

Double Cheeseburger
$3.79
State avg: $3.76
$0.03 above state avg

Double Cheeseburger in O'Fallon averages $3.79. The state average is $3.76.

Filet-O-Fish
$4.99
State avg: $5.17
$0.18 below state avg

Filet-O-Fish in O'Fallon averages $4.99. The state average is $5.17.

McChicken
$2.89
State avg: $2.99
$0.10 below state avg

McChicken in O'Fallon averages $2.89. The state average is $2.99.

Medium Coke
$1.59
State avg: $1.61
$0.02 below state avg

Medium Coke in O'Fallon averages $1.59. The state average is $1.61.

Medium French Fries
$3.44
State avg: $3.44
Same as state avg

Medium French Fries in O'Fallon averages $3.44. The state average is $3.44.

Medium Latte
$4.59
State avg: $3.75
$0.84 above state avg

Medium Latte in O'Fallon averages $4.59. The state average is $3.75.

Medium Minute Maid Orange Juice
$3.49
State avg: $3.23
$0.26 above state avg

Medium Minute Maid Orange Juice in O'Fallon averages $3.49. The state average is $3.23.

Medium Premium Roast Coffee
$1.99
State avg: $2.09
$0.10 below state avg

Medium Premium Roast Coffee in O'Fallon averages $1.99. The state average is $2.09.

Medium Strawberry Shake
$4.44
State avg: $4.41
$0.03 above state avg

Medium Strawberry Shake in O'Fallon averages $4.44. The state average is $4.41.

Ramyeon McShaker Fries
$3.89
State avg: $3.98
$0.09 below state avg

Ramyeon McShaker Fries in O'Fallon averages $3.89. The state average is $3.98.

Saja Boys Breakfast Meal
$7.69
State avg: $8.33
$0.64 below state avg

Saja Boys Breakfast Meal in O'Fallon averages $7.69. The state average is $8.33.

Vanilla Cone
$2.44
State avg: $1.88
$0.56 above state avg

Vanilla Cone in O'Fallon averages $2.44. The state average is $1.88.

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McDonald's O'Fallon — Frequently Asked Questions

Big Mac price in O'Fallon, IL — 2026
The average Big Mac price in O'Fallon, IL is $5.79 as of October 2026, based on 1 McDonald's location tracked across the city. Prices range from $5.79 to $5.79 — a $0.00 spread between the cheapest and most expensive store. The US national average Big Mac is $5.91; O'Fallon is $0.12 (2.0%) below that benchmark. Source: McDonald's mobile app — verified October 2026.
McDonald's menu prices in O'Fallon, IL — full list 2026
McDonald's menu prices in O'Fallon, IL as of October 2026 (city-wide averages across 1 location): Big Mac $5.79, Medium Fries $3.44, Medium Coke $1.59, Medium Coffee $1.99, Cheeseburger $2.49. Figures are city-wide averages sourced from the McDonald's app. Individual stores may charge slightly more or less — each listing on this page shows its own current price.
How many McDonald's locations are in O'Fallon, IL?
MenuPriceTracker tracks 1 McDonald's location in O'Fallon, IL. Each is independently owned by a franchisee who sets their own menu prices. This franchise model explains the price variation in O'Fallon — Big Mac prices range from $5.79 to $5.79, reflecting differences in local labor costs, real estate, and competitive market conditions. Every location is listed on this page with its current app-sourced price.
Are McDonald's prices in O'Fallon above the US national average?
No — the Big Mac in O'Fallon, IL averages $5.79, which is $0.12 (2.0%) below the US national average of $5.91. McDonald's prices are set independently by franchise owners based on local labor and real-estate costs. MenuPriceTracker tracks thousands of US locations to calculate the national benchmark.
McDonald's near me in O'Fallon — which location has the lowest price?
To find the cheapest McDonald's near you in O'Fallon, IL, scroll through the store list on this page — every location displays its live app price so you can compare before you go. All prices are verified from the McDonald's mobile app as of October 2026. For real-time availability, cross-check with the McDonald's app before driving.
McDonald's French Fries price in O'Fallon, IL — 2026
Medium French Fries in O'Fallon, IL average $3.44 as of October 2026, based on 2 locations that report fries pricing. The IL statewide average for Medium Fries is $3.44 — O'Fallon is right at the state average. Each store listing on this page shows the exact fries price at that location.
When were McDonald's prices in O'Fallon last updated?
McDonald's prices for O'Fallon, IL shown on this page were last verified October 2026. MenuPriceTracker collects pricing directly from the McDonald's mobile app across all 1 tracked location. Prices are refreshed monthly. Because franchise owners may update prices at any time, we recommend verifying with the McDonald's app or calling your local store for same-day accuracy.
McDonald's Big Mac price in Belleville vs O'Fallon, IL
Belleville, IL is 1.3 miles from O'Fallon. The average Big Mac in Belleville is $5.72 across 3 locations — $0.07 cheaper than O'Fallon's average of $5.79 (1.2% difference). Driving 1.3 miles to Belleville could save $0.07 per Big Mac compared to the O'Fallon average. Both cities' prices are set by local franchise owners and may vary by individual store. Browse the Belleville city page on MenuPriceTracker for the full price list.
McDonald's Big Mac price in Fairview Heights vs O'Fallon, IL
Fairview Heights, IL is 2.8 miles from O'Fallon. The average Big Mac in Fairview Heights is $5.79 across 1 location — $0.00 the same price than O'Fallon's average of $5.79 (0.0% difference). Both cities' prices are set by local franchise owners and may vary by individual store. Browse the Fairview Heights city page on MenuPriceTracker for the full price list.
McDonald's Big Mac price in Swansea vs O'Fallon, IL
Swansea, IL is 4.3 miles from O'Fallon. The average Big Mac in Swansea is $5.79 across 1 location — $0.00 the same price than O'Fallon's average of $5.79 (0.0% difference). Both cities' prices are set by local franchise owners and may vary by individual store. Browse the Swansea city page on MenuPriceTracker for the full price list.
McDonald's Big Mac price in Caseyville vs O'Fallon, IL
Caseyville, IL is 6.4 miles from O'Fallon. The average Big Mac in Caseyville is $5.79 across 1 location — $0.00 the same price than O'Fallon's average of $5.79 (0.0% difference). Both cities' prices are set by local franchise owners and may vary by individual store. Browse the Caseyville city page on MenuPriceTracker for the full price list.
McDonald's Big Mac price in Lebanon vs O'Fallon, IL
Lebanon, IL is 6.7 miles from O'Fallon. The average Big Mac in Lebanon is $5.89 across 1 location — $0.10 more expensive than O'Fallon's average of $5.79 (1.7% difference). Both cities' prices are set by local franchise owners and may vary by individual store. Browse the Lebanon city page on MenuPriceTracker for the full price list.

MenuPriceTracker vs. Delivery Apps & Other Price Sites

How do these prices compare to what Uber Eats, DoorDash, or Grubhub show?

Uber Eats, DoorDash, Grubhub, and Seamless inflate McDonald's menu prices by 15–30% on top of the in-store price before adding delivery fees, service fees, and tip. The price you see on a delivery app is not what McDonald's charges at the counter. MenuPriceTracker shows the real menu price from the McDonald's app — what you'd actually pay walking into the restaurant or ordering at the kiosk.

Why not just check TripAdvisor for McDonald's prices?

TripAdvisor doesn't track individual McDonald's store prices. Any price information on TripAdvisor is user-submitted, covers only a small fraction of locations, and can be months or years out of date. MenuPriceTracker tracks store-level prices for 9,200+ US McDonald's locations across all 50 states, refreshed monthly from the McDonald's app.

Where does MenuPriceTracker get McDonald's price data?

Prices are collected at the store level from the McDonald's app, covering 9,200+ locations in every US state. Each store's data is refreshed monthly so you see real local prices — not a national estimate, a delivery markup, or crowdsourced guesses. The national average, state averages, and per-city averages on this site are all computed from that same store-level data.