If you've been sitting on a United MileagePlus balance and eyeing a family trip to London, this is a reasonable time to book. Award seats from Chicago O'Hare to London Heathrow are available on August 9, 2026, at 40,000 miles per person in economy, with just $6 in taxes and fees.
This rate comes in about 33% below the 60,000 miles United typically charges for economy awards on this transatlantic route. For a family of four, that's a savings of 80,000 miles compared to booking at standard rates—enough for another domestic round-trip or two.
Availability appears wide open for this date, which is notable given that early August falls squarely in peak summer travel season. That said, award space can shift without notice, so if your dates are flexible, it's worth searching a few days in either direction to see if the same pricing holds.
One practical tip: if you're traveling with kids, consider booking as soon as you've confirmed the itinerary works for your family. Economy award seats at saver-level pricing tend to disappear faster than premium cabin availability, especially for summer travel.
How to book
Search and book directly through United at united.com/en/us/book-flight/united-awards/search.