This award seat prices out at 88,000 United MileagePlus miles, which is about 37% below the roughly 140,000 miles you'd typically see for business class on this route. The taxes and fees come in at just $51, making this a low-cost redemption on the cash side as well.
The catch: only 2 seats are currently showing as available. That's enough for a couple but won't work for larger families unless you can find additional dates with similar pricing. April is a pleasant time to visit London, with mild spring weather and fewer crowds than the summer peak season.
If you have United miles sitting in your account and some flexibility around early April, this is worth a look. Business class on a transatlantic overnight flight makes a real difference, especially if you're traveling with kids and want everyone to arrive rested.
One practical tip: if you're short on United miles, remember that Chase Ultimate Rewards points transfer 1:1 to United. Check your balance across programs before booking.
How to book
Search for award availability and book directly through United at:
https://www.united.com/en/us/book-flight/united-awards/search