Where was Jonah trying to flee to?

Answer: Tarshish

But Jonah ran away from the LORD and headed for Tarshish.

“Jonah, however, got up to flee to Tarshish, away from the presence of the LORD. He went down to Joppa and found a ship bound for Tarshish. So he paid the fare and went aboard to sail for Tarshish, away from the presence of the LORD.”— Jonah 1:3 (BSB)