Tuesday / Wednesday — chain lunch promo window
Many chains run carryout or lunch-window deals mid-week to fill quiet slots. Codes often appear on Monday for the week and quietly stop by Thursday evening. If you can flex your pizza day, Tuesday and Wednesday often produce the largest discount per dollar.
Thursday — promo “Thirsty Thursday” effect
Carryout-only promos often pop up on Thursdays as brands try to ride the pre-weekend bump without cannibalising weekend delivery margins. Watch for carryout-large-pizza specials in particular.
Friday / Saturday — fewer codes, more demand
Weekend evenings are the high-demand window. Brands rarely need to discount aggressively, so fewer broad national codes are active. Local franchise promos still exist, but they're narrower (specific stores, specific menu items).
Sunday — sports-day windows
During football season many U.S. chains run timed Sunday promos. These can be national or local, and many are event-triggered (free or discounted item if the home team does a specific thing). Outside of the season the Sunday promo cadence drops back to ordinary weekend levels.
Holidays
Halloween, Super Bowl Sunday, March Madness weekends, July 4th, and the first week of school are reliable chain-promo peaks. Codes around these dates tend to be wider in availability but heavily redeemed — so brands sometimes shut codes off early when they go viral.
Honest caveat
These are patterns, not promises. A specific brand may have shifted its calendar this quarter, your region may not opt into a national promo, and viral shut-offs happen without notice. Treat “best days” as “watch these first”, not “guaranteed to save money on this day”.