The United (UAL) MileagePlus Explorer from Visa Signature also features some nice additional airport perks, including priority boarding and a free checked bag, and you also get passes to the United Club. The card features a $95 annual fee.
You won't be charged a foreign transaction fee.
The Sapphire Preferred and Venture Rewards cards also follow another trend that's become popular among the best travel rewards cards: They exempt cardholders from having to pay a foreign transaction fee, which many issuers charge for making purchases overseas. That's a good thing, since these fees can be as high as 3% of each transaction.
You'll get an ample bonus for signing up.
Finally, if you're looking to sign up for a travel rewards card, you should wait until the issuer is offering an ample sign-on bonus. (These, too, have become a popular go-to perk for credit card companies looking to widen their customer base.)