This award availability on the Boston to London Heathrow route prices at 88,000 MileagePlus miles each way in business class. That's roughly 37% below the typical rate of around 140,000 miles you'd normally see for this cabin on transatlantic flights. The taxes and fees come in at just $26, which is unusually low for flights touching the UK.
Availability appears solid for July 12, 2026, with plenty of seats showing in the search results. Summer dates to London are notoriously difficult to find at reasonable award rates, so this is worth a look if your travel plans have any flexibility around that window.
For families traveling together, the low taxes make this particularly appealing—booking multiple business class seats to Europe often comes with carrier-imposed surcharges that can add hundreds of dollars per ticket. That's not the case here.
One practical note: United award pricing is dynamic, so these rates can shift without warning. If this works for your schedule, don't wait too long to book. United allows free changes and cancellations on award tickets up to 30 days before departure if your plans shift.
How to book
Search for award availability and book directly through United at united.com/en/us/book-flight/united-awards/search