Economy award tickets from Boston (BOS) to London Heathrow (LHR) are currently bookable through United MileagePlus for 40,000 miles. The taxes and fees come to just $6, making this a straightforward redemption without the hefty surcharges that often accompany transatlantic awards.
This pricing sits well below the typical cost for this route. United usually charges around 60,000 miles for economy awards to London, so you're saving roughly 20,000 miles per ticket at this rate. For a family of four, that adds up to 80,000 miles kept in your account for future trips.
Availability appears strong for August 17, 2026, with plenty of seats showing at this price point. August is peak summer travel season when award space to Europe can be difficult to find, so this is worth considering if you're planning a late-summer trip to the UK.
One practical note: if you're traveling with kids, try to select seats immediately after booking. Even when award space is plentiful, desirable seats in rows together tend to disappear quickly as the departure date approaches.
How to book
Search and book directly through United at united.com/en/us/book-flight/united-awards/search.