If you've been sitting on a modest stash of United MileagePlus miles and eyeing a trip across the pond, this is a sensible time to book. Economy award seats from Boston (BOS) to London Heathrow (LHR) are available for 36,800 miles plus just $6 in taxes on April 14, 2026.
This redemption comes in well below the roughly 60,000 miles United typically charges for this transatlantic route in economy. That 39% savings means a family of four would need around 93,000 fewer miles total compared to booking at standard rates.
Availability appears to be plentiful right now, which is good news if you need to coordinate multiple seats. April is a pleasant shoulder season for London travel, with milder weather and fewer crowds than the summer peak.
Practical tip: If you don't have quite enough miles, United allows you to combine miles with cash or transfer points from Chase Ultimate Rewards at a 1:1 ratio. Check your balances before booking to see which option makes the most sense for your situation.
How to book
Search for award availability and book directly through United at: https://www.united.com/en/us/book-flight/united-awards/search