We're seeing solid availability on the Boston to London Heathrow route in economy class for August 16, 2026. At 40,000 MileagePlus miles plus just $6 in taxes, this is a straightforward redemption with minimal fees—a welcome sight for transatlantic travel during peak summer season.
This rate sits well below the typical 60,000 miles United usually charges for economy awards to London. That 33% discount makes this a worthwhile option if you've been sitting on a MileagePlus balance and have flexible summer plans. Availability appears plentiful at the time of writing, which is somewhat unusual for August travel to Europe.
For families considering this route, the low taxes are a particular advantage. Many European award tickets come with substantial carrier surcharges, but $6 is about as low as you'll see for transatlantic flights. That keeps your out-of-pocket costs minimal.
One practical tip: if you're booking for a family, search for all passengers at once to ensure seats are available together. Award space can vary, and searching individually may show availability that disappears when you try to book multiple tickets.
How to book
Search and book directly through United at united.com/en/us/book-flight/united-awards/search.