This is a solid opportunity for families planning a spring trip to London. At 40,000 miles per person in economy, you're looking at a 33% discount compared to the roughly 60,000 miles United typically charges for transatlantic awards in this cabin. The $6 tax figure is notably low for flights to the UK, where carrier surcharges often push fees much higher.
Availability appears wide open for travel on April 8, 2026, which gives you plenty of time to plan around school schedules or coordinate with other family members. April is also a pleasant time to visit London, with milder weather and fewer crowds than the summer peak season.
One practical tip: if you're booking for a family, search for all the seats you need in a single search to confirm availability before transferring any points from Chase or other partners. United MileagePlus is a transfer partner of Chase Ultimate Rewards at a 1:1 ratio, so this could be a good use of those points if your MileagePlus balance is low.
How to book
Search for award availability and book directly through United at united.com/en/us/book-flight/united-awards/search.