Free SONIC Large Soft Drink Or Tea

SONIC's latest promotion gives registered app and website users a free large soft drink or tea with every Double SONIC Smasher purchase. That refreshing beverage - whether you prefer soda or tea - comes at no extra charge when you order through their digital platforms. Creating an account takes barely any time if you haven't already, and logging in during checkout is the key step many people overlook. The Double Smasburger is plenty filling on its own, but adding a large drink makes it feel like a complete meal deal. Just be aware this isn't valid for combo meals, delivery orders, or with other discounts - and only at participating SONIC locations. You've got until November 2, 2025 to take advantage, though I'd suggest trying it sooner rather than later.