Eh, honestly quite risky lah at 35 weeks especially with GDM, a few of my mum friends who had gestational diabetes said dekat 28w their doctors sudah tidak allow travel because of monitoring needs and delivery readiness. Your blood sugar levels kena check regularly, and kalau ada emergency at 35w you're getting close to full term already, so better to settle down near your hospital where your doctor knows your case. It's not worth the stress on your body and baby, trust me!