United MileagePlus: First Class to London for 140,000 Miles (April 2026)

United MileagePlus is showing first class award space from Boston to London Heathrow for 140,000 miles plus $30 in taxes, which is about 36% below what you'd typically pay for this premium cabin route.

This award availability is for travel on April 2, 2026, departing from Boston Logan (BOS) and arriving at London Heathrow (LHR). At 140,000 miles plus just $30 in taxes and fees, the cash outlay here is minimal compared to many transatlantic premium cabin awards that can carry fuel surcharges in the hundreds of dollars.

For context, first class awards on this route through United MileagePlus typically price around 220,000 miles. That puts this deal at a meaningful discount of roughly 80,000 miles—enough for a separate domestic round-trip ticket on many routes.

Availability is limited to just 4 seats, so this works for a couple or a small family traveling together. If you have a larger group, you'll likely need to split across cabins or look at different dates.

One practical note: April is a pleasant time to visit London with milder weather and smaller crowds than summer months. Spring break travelers should check if this date aligns with their school calendar.

How to book

Search and book directly through United's award search tool at united.com. Log into your MileagePlus account, select the award travel option, and enter your dates and route to find this availability.