This award availability on the Boston to London route prices at 40,000 AAdvantage miles plus $484 in taxes and fees. Premium economy offers a meaningful upgrade over standard economy, with extra legroom, better meal service, and priority boarding—a nice option for families on longer transatlantic flights.
For context, this same routing in premium economy typically runs around 70,000 miles through American's program. At 40,000 miles, you're saving 30,000 miles per ticket, which adds up quickly if you're booking for two travelers.
A few things to keep in mind: only 2 seats are showing at this price, so this won't work for larger families unless additional space opens up. The $484 in taxes and fees is standard for award tickets to the UK, where carrier surcharges tend to be higher. June 1 is right at the start of peak summer travel season to Europe, which makes this pricing more notable.
If your travel dates are flexible, it's worth searching nearby dates to see if similar availability exists. Award space to London can be unpredictable, so booking promptly is wise if this fits your plans.
How to book
Search and book directly through American Airlines at aa.com. Log into your AAdvantage account, select "Redeem miles," and enter Boston (BOS) to London (LHR) with your travel date.