How much is a Denny's Grand Slamwich Combo in Illinois?

As of 2026-10-05, a Grand Slamwich Combo costs $14.29 to $18.79 at 42 Denny's restaurants in Illinois, typically $17.49.

Where is the cheapest Denny's in Illinois?

The cheapest Denny's in Illinois is at 1310 E. CHAIN OF ROCKS RD., Pontoon Beach, comparing the same basket at 30 restaurants (Drive Thru Index, 2026-10-05).

Denny's prices in Illinois

Name: Denny's Prices in Illinois (2026) | Drive Thru Index
Creator: Drive Thru Index
License: https://drivethruindex.com/insights#citing

42 Denny's restaurants in Illinois, prices checked 2026-10-05.

Key findings

A Denny's Grand Slamwich Combo typically costs $17.49 in Illinois ($14.29 to $18.79 across 42 restaurants). Denny's here is 2% below its typical price in the US.

Every Denny's in Illinois, by town

Each restaurant links to its full menu with prices. A town with its own page links to it, where every brand there is compared.

City	Restaurants	Typical Grand Slamwich Combo	Restaurant
Arlington Heights	1	$14.99	17 W Algonquin Rd
Aurora	1	$16.99	4330 Fox Valley Center Dr
Belleville	1	$15.79	1130 S.illinois St.
Bloomington	1	$17.79	701 Eldorado RD
Bolingbrook	1	$16.19	126 East N Frontage Rd
Bourbonnais	1	$17.79	1303 Armour Road
Calumet City	1	$17.59	1380 Torrence Avenue
Carol Stream	1	$17.79	363 S. Schmale Road
Carpentersville	1	$16.99	200 Springhill RD
Champaign	1	$16.89	702 W Town Center Blvd.
Collinsville	1	$17.79	522 Ramada Blvd
Effingham	1	$17.49	1307 N Keller DR
Franklin Park	1	$17.59	2447 Mannheim Road
Glen Carbon	1	$18.79	27 Junction DR
Gurnee	1	$16.99	6429 Grand Ave
Hanover Park	1	$15.19	1086 E Lake St
Hickory Hills	1	$17.59	7627 W. 95th Street
Highland Park	1	$18.29	2063 Skokie Valley
Hoffman Estates	1	$17.59	1175 North Roselle Road
Joliet	1	$17.59	2531 Plainfield Road
Lasalle	1	$16.99	343 Civic Road
Litchfield	1	$16.99	1407 W Hudson Blvd
Mokena	1	$17.59	19099 S Old Lagrange RD
Mt. Vernon	1	$15.79	4610 Broadway
N Aurora	1	$16.99	412 S Lincolnway
N Pekin	1	$17.49	115 Radio City DR
Normal	1	$17.79	1615 N. Main
Norridge	1	$15.99	4609 N. Harlem Avenue
O' Fallon	1	$16.99	737 W HWY 50
Oak Lawn	1	$16.99	9217 S. Cicero Ave
Oak Park	1	$17.59	711 North Harlem Avenue
Oakbrook Terrace	1	$17.59	17 W 660 22Nd Street
Palatine	1	$14.99	975 E. Dundee Road
Pontoon Beach	1	$15.19	1310 E. Chain OF Rocks Rd.
Rockford	1	$17.49	7375 E State ST
Salem	1	$17.49	100 Holiday Lane
Schiller Park	1	$15.39	4824 No. River Road
South Beloit	1	$17.49	16049 Willowbrook RD
Vandalia	1	$14.29	4 Interstate Drive
Waterloo	1	$16.99	959 N Ilinois RT 3
Waukegan	1	$17.79	3890 Northpoint Blvd.
Willowbrook	1	$17.59	7737 S. Kingery HWY

More prices

Questions people ask

How much is a Denny's Grand Slamwich Combo in Illinois?: As of 2026-10-05, a Grand Slamwich Combo costs $14.29 to $18.79 at 42 Denny's restaurants in Illinois, typically $17.49.
Where is the cheapest Denny's in Illinois?: The cheapest Denny's in Illinois is at 1310 E. CHAIN OF ROCKS RD., Pontoon Beach, comparing the same basket at 30 restaurants (Drive Thru Index, 2026-10-05).

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/brands/dennys/illinois), prices checked 2026-10-05. You are welcome to quote any figure on this page.