A free $20 dinner sounds too good to be true, but Prime members in the US can currently get exactly that. Ahead of Amazon's Prime Big Deal Days, Grubhub is offering $20 off any restaurant order of $30 or more when you apply the code DEALS20 at checkout. The offer runs through October 5, can only be used once per account, and the $30 minimum applies to your subtotal before tax, tip and delivery fees.

There's a catch, sort of: the code only works for people who have activated Grubhub+ through their Prime membership. That's easier than it sounds, because any active Amazon Prime member in the US can link their accounts and get Grubhub+ at no extra cost — normally a paid subscription tier. Orders placed through Grubhub or Seamless, or via the Grubhub storefront on Amazon itself, all qualify.

If you haven't linked your accounts yet, there's a second deal worth stacking. New Grubhub+ users linked to Prime can take $10 off a first order of $20 or more with the code FIRSTORDER, valid through October 15. Do the maths and that's $30 off two meals — spend $20 on the first order, $30 on the second, and you're eating well on the cheap for two nights. Worth noting the fine print: orders containing alcohol are excluded from these promotions, and each code works only once.

One practical warning from the source: Grubhub can end either promotion early, and demand around Prime Big Deal Days tends to be high. If you want the discount, don't leave it until the evening of October 5.

Why should a travel site care? Because these perks follow you on the road. If you're on a domestic trip in the US — a long layover in a city, a hotel stay where the food options are thin, a rental with a kitchen but no groceries — a free Grubhub+ subscription stacked with a $20 credit turns delivery into a genuinely budget-friendly dinner option. For anyone who already pays for Prime, the Grubhub+ link is a no-brainer: it costs nothing to activate, waives delivery fees on eligible orders, and currently hands you up to $30 in credits for the effort of entering two promo codes.

Who it's for: US-based Amazon Prime members, or travellers staying somewhere Grubhub operates who happen to have a Prime account. If you're neither, this one's not for you — but if you are, set a reminder to use DEALS20 before October 5 and FIRSTORDER before October 15.

Story via The Points Guy.