on a passport or with a passport

[ostap77]

Do I enter a foreign country on a valid passport or with a valid passport?

[billmcd]

Do I enter a foreign country on a valid passport or with a valid passport?

"With" would be proper, but "on" is used also.

[emsr2d2]

Do I enter a foreign country on a valid passport or with a valid passport?

I used to work at an airport in an official capacity and we used "He is travelling on a [nationality] passport". If you're talking about validity, then it doesn't really matter.

I have a valid passport.
I travel on a valid passport.
I entered the country with a valid passport.

Mind you, without a valid passport, you wouldn't be entering any country with an enforced border control.

[ostap77]

I used to work at an airport in an official capacity and we used "He is travelling on a [nationality] passport". If you're talking about validity, then it doesn't really matter.

I have a valid passport.
I travel on valid passport.
I entered the country with a valid passport.

Mind you, without a valid passport, you wouldn't be entering any country with an enforced border control.

Do I travel on a valid passport or on valid passport?

[emsr2d2]

Do I travel on a valid passport or on valid passport?

You need the article so "a valid passport".

[ostap77]

You need the article so "a valid passport".

Why would you have written "I travel on valid passport"? Guess a misspelling?

[emsr2d2]

Why would you have written "I travel on valid passport"? Guess a misspelling?

OOPS! Yes, that was a typo. I have edited my original comment and added the article.