Hey! Getting to Westfield by tube is pretty straightforward. If you’re heading to Westfield London (White City), you can take the Central Line straight to White City Station. From there, it’s just a short walk to the shopping center.
If you’re going to Westfield Stratford City, you’ll want to hop on the Central Line as well, but get off at Stratford Station. Again, it’s a short walk to the shopping center from there.
Both stations are well signposted, so you shouldn’t have any trouble finding your way. And just a heads up—these places can get pretty busy, especially on weekends, so plan accordingly. Have a great time shopping!