Episode 8 was shown on BBC One at 9pm on Wednesday (11th June 2025) and, according to Broadcast, pulled in 4.2 million overnight viewers as the four remaining teams raced to the final checkpoint.
It is also significantly larger than BBC One's slot average (2.9m) for the evening and the biggest BBC factual title of 2025 so far.
Race Across the World blew away Wednesday evening's competition as the other terrestrial channels failed to hit seven figures.
In the slot on Channel 4, an episode of Britain’s Most Expensive Homes returned 597,000.
Mother-son duo Caroline and Tom started with a lead of six hours and 54 minutes over sisters Elizabeth and Letitia in second place, with young couple Fin and Sioned back in third, and brothers Brian and Melvyn bringing up the rear.
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