"National Cheeseburger Week: Burger King's Tasty Offers."

Burger King is celebrating National Cheeseburger Day on September 18.

They are offering free cheeseburgers to Royal Perks rewards program members with a $1+ purchase.

The celebration lasts for seven days, from September 18 to September 24.

On September 19, spending $1 or more gets you a free Whopper Jr.

On September 20, Whoppers are available for just $3.

September 21 features a buy-one-get-one (BOGO) deal on all Whoppers.

September 22 offers free onion rings with any purchase of $1 or more.

On September 23, they have a $22 family bundle deal.

September 24 grants double reward points on all purchases.

Wendy's is also celebrating with a 1 cent Junior Bacon Cheeseburger deal from September 18 to September 22.