If you’d been considering applying for the United℠ Explorer Card, Chase has made the upfront incentive a little less appealing. The card still offers the following sign-up bonus: 40,000 bonus miles after you spend $2,000 on purchases in the first 3 months your account is open. But as of Aug. 16, 2018, the card no longer offers... Chanelle Bessette is a writer at NerdWallet.