Istanbul, Turkey

Istanbul feeds you around the clock: simit carts at dawn ($0.30), balık ekmek by the Galata Bridge at lunch ($2.00), and midye dolma stuffed mussels at midnight ($1.50 for six). With over 5,000 registered street vendors, it is the most affordable major city on this list, with an average meal price of $2.10—outpacing Mexico City's $2.50 average and offering 30% more vendor variety per capita.