Okay I figured it out. Instead of using this rewrite rule:
add_rewrite_rule('^somepage/([^/]*)/([^/]*)/([^/]*)/?','index.php?p=27&target=$matches[1]&arrival=$matches[2]&departure=$matches[3]','top');
I now use this one:
add_rewrite_rule('^somepage/([^/]*)/([^/]*)/([^/]*)/?','index.php?pagename=somepage&target=$matches[1]&arrival=$matches[2]&departure=$matches[3]','top');
And now everything works like I wanted it to. Obviously using the page id instead of the page name was the problem.
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