この搭乗口に行くにはどうやって行けばいいですかって英語でなんて言うの？

You can be specific about which gate you are looking for by asking how to get to 'Gate F' or whatever the name of the gate. It will make it easier for the person you are asking to know exactly which gate you are looking for.

"How do I get to the boarding gate?"
"Get to" - How do I find what I am looking for.
"Boarding gate" - you could also say, "Gate" or "Boarding area."

"My flight is boarding, how do I get to the gate?"
If you are running late this is a good question to ask in order to find your gate quickly.

"Where can I find gate __?"
This might be the most common question. Just say "Where can I find..." and then tell what the gate number or letter is.

All three of these questions will get an answer very quickly. They are efficient ways to get directions. Airport officials are often busy and a simple question is best. As a courtesy, I will usually add something like "Excuse me." or "Pardon me." before the question.

When we are looking for a place, we use the questions "where" followed by the place we are looking for and the verb is. This is the most simple and easy way to find a place you are looking for no matter where you are looking for.

Asking someone 'which way'it is to ask for directions to a particular place, in this case it is to a specified gate in an airport.

"Could you...please," is a polite way of asking for information or directions. "Any idea where....?" is an alternative and more relaxed form.
"Any idea where the number 23 bus stops?"