1 and 3 are fine.
With "from" in the sentence, "away" is unneeded.
1. Ulleongdo is 87.4 km away from Dokdo.
2. It is 87.4 km away from Ulleongdo to Dokdo.
3. It is 87.4 km from Ulleongdo to Dokdo.
(Are they all grammatical?)
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