The risk of getting a round trip plane ticket is that you'll never know when there's an emergency across your trip and you have no time to rebook your flight. Then, so you missed your flight and turn it into a waste and you have no choice but to get another ticket and that will cost you double. I had this personal experience when I traveled to somewhere and it's not a good experience that it wasted my money. So, I told myself that the next time I travel, I will no longer book for a round trip ticket. But that's just for me but it can happen to anyone too. I'm just sharing this thinking that I could give you an idea but still the decision is up to you. Have a safe trip!