diff --git a/cpp/cmake_modules/ThirdpartyToolchain.cmake b/cpp/cmake_modules/ThirdpartyToolchain.cmake
index 1925a7a45b4..ec29444d0c9 100644
--- a/cpp/cmake_modules/ThirdpartyToolchain.cmake
+++ b/cpp/cmake_modules/ThirdpartyToolchain.cmake
@@ -703,9 +703,10 @@ endif()
 
 # - Parquet requires boost only with gcc 4.8 (because of missing std::regex).
 # - Gandiva has a compile-time (header-only) dependency on Boost, not runtime.
-# - Tests needs Boost at runtime.
+# - Tests and Flight benchmarks need Boost at runtime.
 if(ARROW_BUILD_INTEGRATION
    OR ARROW_BUILD_TESTS
+   OR (ARROW_FLIGHT AND ARROW_BUILD_BENCHMARKS)
    OR ARROW_GANDIVA
    OR (ARROW_WITH_THRIFT AND Thrift_SOURCE STREQUAL "BUNDLED")
    OR (ARROW_PARQUET