If you've been sitting on a United MileagePlus balance and eyeing a spring trip to London, this is a solid redemption. Economy awards from Chicago O'Hare (ORD) to London Heathrow (LHR) are pricing at 40,000 miles with minimal taxes—just $6 on top.
This route typically runs around 60,000 miles for economy awards through United, so you're looking at a savings of roughly 20,000 miles per ticket. For a family of four, that's 80,000 miles back in your pocket for future travel.
Availability is wide open for April 6, 2026, which gives you plenty of time to plan around school schedules or coordinate with other family members. As always with award space, dates can disappear, so it's worth locking in sooner rather than later if your plans are flexible enough to commit.
Practical tip: If you don't have enough miles in your account, United does allow you to purchase miles to top off a booking. Just run the math first—sometimes it makes sense, sometimes it doesn't.
How to book
Search and book directly through United's award search tool: https://www.united.com/en/us/book-flight/united-awards/search