If you've been sitting on a modest United MileagePlus balance and eyeing a spring trip to London, this is a solid opportunity to put those miles to work. Economy award space from Boston (BOS) to London Heathrow (LHR) is available for 36,800 miles each way, with minimal taxes of just $6.
This represents a meaningful discount from the typical redemption rate of around 60,000 miles for this transatlantic route. You're getting roughly 39% more value per mile compared to standard pricing, which makes this a smart use of your balance—especially for a family booking multiple seats.
Availability appears to be wide open for travel on April 7, 2026, which is good news if you're booking for a group. April is a pleasant time to visit London, with milder weather and smaller crowds than the summer peak season.
One practical note: these saver-level award rates tend to come and go, so if this fits your schedule, it's worth locking in sooner rather than later. United does allow free changes and cancellations on most award tickets up to a certain point, giving you some flexibility if plans shift.
How to book
Search for award availability and book directly through United at: https://www.united.com/en/us/book-flight/united-awards/search