Are you planning to spend a day or two at the stopover? I love Bangkok – it’s a big, smelly Asian city the backpacker streets (around Kho San Road) are great fun, and the palace and reclining Buddha are lovely. I’m a woman on my own – use your common sense and you’ll be fine.
Or Singapore – clean, safe, shopping heaven (if that’s your thing).
I am travelling to Australia alone in July.
Which route and stop over do people think is the best for a solo female traveller ?