The airline will support the athlete as she represents the nation globally, by flying her to tournaments and training around the world, including next year’s French and US Opens and the Masters’ events in California and Rome.
The news follows Raducanu’s triumph at the US Open in September 2021, where she became the first British woman to win a Grand Slam title since 1977.
Tom Stevens, British Airways’ director of brand and customer experience, said: "As we look ahead to the world opening up again, we’re excited to be supporting the very best of British talent, Emma Raducanu.
"We couldn’t have been prouder as a nation than when Emma won the US Open."
Raducanu said the airline has "taken such good care" of her and her team since the US Open.
"To be partnering with such an iconic British brand that can play a big role in my performance makes a lot of sense to me," she added.
"I’m fascinated by aviation and we have some interesting projects planned together."