I saw her off to the airport.
I saw her off at the airport.
Which preposition is used in this case?
Thanks.
" is correct.
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Seeing her off means to accompany her to the place where she will be departing and wish her farewell:
https://idioms.thefreedictionary.com/see+off
As indicated above, accompanying her to the place of her departure uses the preposition to, but since the concluding action of the idiom is to wish
I saw her off at the airport. = This is possible in situation in which you went to the airport by yourself to say goodbye.anonymous
I saw her off to the airport. = You are accompanying someone to the airport