I received the targeted email offer below from United (check your inbox!). In short, fly 1 round trip before July 15th and earn 5,000 bonus miles. Fly 2, get 10,000 miles. Fly 4, earn 25,000 miles. It says it’s only available to the recipient, so unfortunately I don’t have an offer code to share.
Promo is only good on tickets booked after you register and flights must be completed by July 15th. Flights July 3-5 don’t count. Flights also must be on United or United Express metal (codeshares operated by other airlines also don’t count).