AirHint found the following cheapest return flights from Boston (BOS) to Zagreb (ZAG) in May 2026 (see full year).
Return flights
| 05 May - 19 May | Iberia | ||
| 19 May - 13 Jun | Lufthansa | ||
| 02 May - 16 May | Lufthansa | ||
| 22 May - 31 May | Aer Lingus |
Also check the deals for one-way flights from Boston to Zagreb in May.
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