AirHint found the following cheapest return flights from Washington (IAD) to Split (SPU) in December 2025 (see full year).
Return flights
| 30 Dec - 06 Jan | Lufthansa | ||
| 24 Dec - 31 Dec | Austrian Airlines | ||
| 24 Dec - 30 Dec | Lufthansa | ||
| 14 Dec - 03 Jan | Frontier Airlines | ||
| 19 Dec - 28 Dec | Frontier Airlines |
Also check the deals for one-way flights from Washington to Split in December.
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