This is a solid option for families planning a fall trip to London. At 39,300 miles per person, a family of four would need 157,200 miles total, saving roughly 42,800 miles compared to the typical 50,000-mile rate. The $46 in taxes is also notably low for transatlantic travel to the UK.
Availability appears to be wide open for September 21, 2026, which means you should have flexibility when selecting seats together. September is a pleasant time to visit London, with thinner crowds than summer and generally mild weather.
Keep in mind that Aeroplan is a transfer partner of American Express Membership Rewards, Chase Ultimate Rewards, Capital One, and Bilt Rewards. If you don't have enough Aeroplan miles on hand, you can top up your balance with an instant transfer from one of these programs.
One practical tip: if you're booking for a family, search for all passengers at once to ensure the system shows availability for the full group on the same flight.
How to book
Search and book directly through Air Canada Aeroplan at aircanada.com.