AirHint found the following cheapest return flights from Seattle (SEA) to Sofia (SOF) in August 2026 (see full year).
Return flights
| 23 Aug - 06 Sep | Icelandair | ||
| 04 Aug - 04 Sep | Icelandair | ||
| 02 Aug - 07 Sep | Icelandair | ||
| 05 Aug - 05 Sep | Air France |
Also check the deals for one-way flights from Seattle to Sofia in August.
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