The Long-billed Dowitcher breeds in Alaska, north-west Canada, and Siberia. They winter in southern U.S. and Mexico. The Long-billed Dowitcher is similar to the Short-billed Dowitcher but, their bills are slightly longer. Long-billed Dowitcher are usually found in smaller flocks than Short-billed.

During breeding, Long-billed Dowitchers eat insects and insect larvae. Otherwise, they eat mollusks, crustaceans, marine worms, and other aquatic invertebrates.