NerdWallet reviewed more than 75 travel cards. To be considered, a card had to be widely available, charge no annual fee and deliver an overall rewards rate in excess of 1%. That means either a flat rate of more than 1% or a base rate of 1% with one or more bonus categories at rates of 2% or more. The cards we reviewed include products from NerdWallet partners, but this did not influence our selection of the winner.