If you've been holding United miles for a family trip to London, this is a reasonable time to take a look. Chicago to London Heathrow is available for 40,000 MileagePlus miles each way in economy, with travel dates around July 10, 2026. The taxes and fees come in at just $6, which is notably low for transatlantic awards.
For context, economy awards on this route typically price at around 60,000 miles through United's dynamic pricing. At 40,000 miles, you're saving roughly 20,000 miles per ticket—meaningful savings if you're booking for a family of four.
Availability appears wide open right now, so you shouldn't have trouble finding seats if your dates are flexible around that window. July is peak summer travel season to Europe, which makes this pricing less common than you'd see in shoulder months.
One practical note: United's award pricing fluctuates frequently, so if this works for your plans, it's worth booking sooner rather than waiting. You can cancel United awards for free up to 30 days before departure if your plans change.
How to book
Search and book directly through United's award search tool: https://www.united.com/en/us/book-flight/united-awards/search