To avoid paying for seat selection on British Airways in 2026, the most common method is to wait until online check-in opens 24 hours before your flight. At this window, most passengers can choose from the remaining available seats for free. However, there are several "automatic" ways to secure free seats earlier. If you hold Silver or Gold status in the Executive Club (or oneworld Sapphire/Emerald), you can choose seats for your entire party at the time of booking for free. Families traveling with children under 12 are also guaranteed to be seated together without an extra fee; BA typically assigns these seats a few days before departure if you haven't paid. Additionally, those traveling with an infant under 2 can select a seat for their entire party for free at the time of booking to ensure a carrycot position is available.