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<http://schema.org/text>
"You can find flights from Barcelona to Kassel to cost on average $127 (€103) one way if you book within the next 7 days. But we recommend buying plane tickets in advance to score the best deals and save money on your route. You’ll see tickets for the Barcelona to Kassel flight generally on sale a few months before the planned travel date."
<https://www.omio.com/flights/barcelona/kassel-l3ewk>