Try some new hookup sites
If the hookup dating site you are currently using doesn't appear to have women in the area you're traveling, don't freight. Different sites are popular in different areas so try joining a new site to find local women near you on your trip. Not to mention that every site you're on connects you with more and more women to fuck. So increase your opportunities and join some new hookup sites.
Let them know you want to fuck
Make sure your profile hits to the point that you're traveling and aren't looking for anything long term. This will help save your time from women unwilling to hookup the first time you meet.
Don't limit yourself
Traveling is an adventure so be open to new experiences and people. Message women you normally wouldn't. Not only will this give you new experiences but it will increase your chances of hooking up on your trip. Don't put all your eggs in one basket because if they don't respond in time or you can't find a time that works for both of you, you may end up without anyone.
Don't miss out
Don't forget to check your messages on all of your sites as much as possible and keep notifications on so that you don't miss out when women message you. If you don't respond quickly they could chicken out or find someone else to hookup with so stay alert. Also, keep in mind where you are in the city so you can easily find a place to meet. Be able to easily meet them without having to ask them for directions - be confident!
Lastly, even if you're just in town for a work conference or meeting, find ways to explore the city and have fun so that you can make yourself sound more outgoing and adventurous if they ask you what you've seen of their city. Find some good bars or clubs that you two could meet up at and start a sexy night together.