This award availability represents a 57% discount from the roughly 200,000 miles American typically charges for first class on this route. At 85,000 miles per person, it's a reasonable redemption for those who have been accumulating AAdvantage miles through credit card spending or flying.

The catch here is the taxes and fees, which come in at $1,538 per ticket. That's a significant cash outlay on top of your miles, largely due to UK Air Passenger Duty and carrier surcharges. Factor this into your decision, especially if you're booking for multiple family members.

Only three seats are showing as available, so this works for a solo traveler, a couple, or a small family—but larger groups will need to look elsewhere. Award space like this tends to disappear quickly once it surfaces, so if it fits your plans, don't wait too long to book.

One practical tip: if the taxes give you pause, compare this redemption against business class options on the same route, which typically carry lower fees and still offer lie-flat seats for the overnight crossing.

How to book

Search and book directly through American Airlines at aa.com. Log into your AAdvantage account, select "Redeem miles," and enter Miami (MIA) to London (LHR) with your travel date of April 4, 2026.