If you've been sitting on a United MileagePlus balance and eyeing a family trip to London, this is a reasonable time to book. Economy seats from Boston (BOS) to London Heathrow (LHR) are available on July 8, 2026, for 40,000 miles plus $6 in taxes per person.
This rate is notably lower than the ~60,000 miles United typically charges for transatlantic economy awards on this route. The minimal taxes are also a welcome contrast to some partner bookings that can tack on hundreds in carrier surcharges.
Availability appears to be wide open, which is good news for families needing multiple seats. July is peak summer travel season for Europe, so finding award space at a reduced rate during this window is worth acting on if your dates are flexible.
One practical tip: if you don't have quite enough miles, United allows you to combine miles with cash, or you can transfer Chase Ultimate Rewards points to MileagePlus at a 1:1 ratio to top off your balance.
How to book
Search and book directly through United's award search tool: https://www.united.com/en/us/book-flight/united-awards/search