接机留学女朋友时，可以采用以下几种表达方式：

热情问候

"Hi, you must be XXX, it's really good to see you! Especially after such a long time flight."

表达思念

"I missed you so much! It feels like ages since we last saw each other."

关心舒适

"Are you tired？ Let's go home and relax after the flight."

表达爱意

"I'm so glad you're back. I've missed you so much."

关心生活

"How was your trip？ Did you have a good flight？"

表达支持

"I'm here for you. Whatever you need, just let me know."

温馨告别

"Let's grab a bite to eat. I'm starving!"

这些表达方式可以根据你们之间的关系和具体情况灵活调整，确保真诚和热情地表达你的情感。