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The phrase "travel alone" is correct and usable in written English.
You could use it when referring to someone who is traveling without companions, for example: "My sister loves to travel alone, exploring new places".
Exact(60)
Did you travel alone?
I usually travel alone.
Redesdale doesn't travel alone.
Do you always travel alone?
The air travel alone would kill me".
God knows she could never travel alone.
So Ms. Burggraaf had to travel alone.
Why did I decide to travel alone?
If you travel alone, you talk to the world.
About 30 per cent of gappers choose to travel alone.
She was terrified to fly or even travel alone.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com