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 currently available for 40,000 miles one-way in economy, with just $50 in taxes and fees. That's a meaningful discount from the 60,000 miles United typically charges for this transatlantic route.
Availability looks strong around July 18, 2026, which falls right in the middle of summer travel season—a period when award space to Europe can be harder to find. For families planning ahead, locking in seats now at this rate makes sense before dynamic pricing pushes costs back up.
One practical note: United's award pricing fluctuates based on demand, so if you see dates that work for your schedule, don't wait too long to book. MileagePlus awards can be canceled and redeposited for a fee if your plans change, or for free if you have Premier status.
How to book
Search for award availability and book directly through United at:
https://www.united.com/en/us/book-flight/united-awards/search