This is a solid opportunity for families planning a spring trip to London. At 36,800 miles per person, a family of four could fly roundtrip for well under 150,000 miles total on the outbound—assuming similar availability on the return. The $6 tax figure is notably low for transatlantic travel, where fuel surcharges can sometimes add hundreds of dollars.
For context, United typically prices economy awards on this route around 60,000 miles each way. This deal represents meaningful savings, especially for those with MileagePlus balances from credit card bonuses or partner transfers. Chase Ultimate Rewards points transfer 1:1 to United, making this accessible even if your MileagePlus account is light.
Availability appears strong for April 9, 2026, with plenty of seats showing at this price point. As always with award space, specific dates can vary, so it's worth checking nearby dates if your schedule is flexible.
Practical tip: If you're booking for a family, search for one passenger first to confirm availability, then call United to book multiple seats together if the website won't show enough inventory in a single search.
How to book
Search and book directly through United's award search tool: https://www.united.com/en/us/book-flight/united-awards/search