3 United credit cards are now offering elevated sign-up bonuses of up to 150,000 miles for a limited time Summary List Placement Chase has increased the welcome bonuses on three United credit cards . United miles don''t expire, so it''s a good time to apply even if you don''t have travel plans yet. All of these cards come with solid perks, including access to expanded United award availability Read Insider''s guide to the best rewards credit cards . Table of Contents: Masthead Sticky United MileagePlus miles are an excellent choice if you''re looking to earn rewards that never expire which is important since many of us aren''t yet sure when we''ll start traveling again. You can redeem United miles for award flights on United and over two dozen partner airlines, including Air Canada, Lufthansa, and ANA. Chase has just launched limited-time offers on three of its co-branded United Airlines cards , and they''re worth considering if you want to give your United miles balance a big boost: Limited-time Chase United credit card offers United Explorer Card : Earn United Explorer Card United Business Card : Earn United Business Card United Gateway Card : Earn United Gateway Card All of these United cards come with a little-known but incredibly valuable perk.