United MileagePlus is showing first class award availability from Boston (BOS) to London Heathrow (LHR) on July 17, 2026. The price is 140,000 miles plus $50 in taxes and fees, with just one seat remaining at this rate.
This represents solid value for transatlantic first class. The typical redemption rate for this route and cabin runs around 220,000 miles through United's program, making this roughly 80,000 miles cheaper than what you'd normally expect to pay. First class awards to London are rarely cheap, so finding one under 150,000 miles is worth a look if you have the balance.
Keep in mind this is a single seat, which limits the usefulness for families traveling together. However, if you're a solo traveler or one parent is happy to fly separately in a different cabin, this could work. July is peak summer travel season, which makes finding any premium cabin availability notable.
Act quickly if you're interested—single-seat availability like this tends to disappear fast, and there's no way to know if more seats will open up at this price point.
How to book
Search for award availability and book directly through United at: https://www.united.com/en/us/book-flight/united-awards/search