flagbase
Red and Yellow flags
5 flags (5 of them countries or territories) whose main colors are exactly red and yellow.
Color codes
Palettes that also include red and yellow
Red, Blue and Yellow flags (13)
Red, Yellow and Black flags (4)
Red, White, Blue and Yellow flags (10)
Red, Green and Yellow flags (13)
Red, White, Blue, Green and Yellow flags (7)
Red, White, Green, Yellow and Black flags (5)
Red, Green, Yellow and Black flags (4)
Red, White, Green and Yellow flags (4)