This fare from LAX to LHR prices at 120,000 United miles with minimal taxes and fees. For context, business class awards on this route typically run around 140,000 miles through MileagePlus, so you're looking at a solid discount of about 20,000 miles.
The catch: there's only one seat available on April 27, 2026. That makes this a better fit for a solo traveler than a family trip, but it could work if one parent needs to head over early or you're planning an adults-only getaway.
One practical consideration—April is a pleasant time to visit London, with spring weather settling in and fewer crowds than summer. Just keep in mind that the week contains a UK bank holiday weekend, so popular attractions may be busier than usual.
If you're thinking about this one, don't wait too long. Single-seat availability tends to disappear quickly, and there's no guarantee it will reprice at this level if you come back later.
How to book
Search for award availability and complete your booking directly through United: https://www.united.com/en/us/book-flight/united-awards/search