If you've been planning a family trip to London next summer, this is a practical opportunity to stretch your MileagePlus balance further than usual. Economy seats from Chicago O'Hare to London Heathrow are pricing at 40,000 miles one-way, with minimal taxes of just $6. Availability for July 7, 2026 looks strong, with plenty of seats showing across multiple searches.
This rate sits well below the 60,000 miles United typically charges for economy awards on this transatlantic route. That 20,000-mile savings per person adds up quickly for a family of four, effectively giving you a free ticket's worth of miles back in your account.
One thing to keep in mind: July is peak summer travel season, so if your dates have any flexibility, search a few days in either direction to confirm this pricing holds. Award availability and pricing can shift, so booking sooner rather than later is wise if this fits your plans.
How to book
Search and book directly through United's award search tool at united.com. Log into your MileagePlus account, select your dates, and filter for award tickets to see current availability.