During migration, common nighthawks may travel 2,500 to 6,800 kilometres (1,600 to 4,200 mi).
They migrate by day or night in loose flocks; frequently numbering in the thousands, no visible leader has been observed.
The enormous distance travelled between breeding grounds and wintering range is one of the North America's longer migrations.
The northbound journey commences at the end of February and the birds reach destinations as late as mid-June.
The southbound migration commences mid-July and reaches a close in early October.

While migrating, these birds have been reported travelling through middle America, Florida, the West Indies, Cuba, the Caribbean and Bermuda, finally completing their journey in the wintering grounds of South America, primarily Argentina.

As aerial insectivores, the migrants will feed en route, congregating to hunt in marshes, rivers and on lakeshores.
In Manitoba and Ontario, Canada, it is reported that during migration the nighthawks are seen most commonly in the late afternoon, into the evening, with a burst of sunset feeding activities.

Additionally, it has been noted that during migration the birds may fly closer to the ground than normal; possibly foraging for insects.
There is speculation that feeding also occurs at higher altitudes.

The common nighthawk winters in southern South America, but distribution in this range is poorly known due to difficulties in distinguishing the bird from the lesser nighthawk and in differentiating between migrants and overwintering birds.
In some South and Central American countries, a lack of study has led to restricted and incomplete records of the bird.
Records do support wintering in Ecuador, Peru, Bolivia, Brazil, Paraguay, Uruguay and Argentina.
During migration, common nighthawks may travel 2,500 to 6,800 kilometres (1,600 to 4,200 mi). They migrate by day or night in loose flocks; frequently numbering in the thousands, no visible leader has been observed. The enormous distance travelled between breeding grounds and wintering range is one of the North America's longer migrations. The northbound journey commences at the end of February and the birds reach destinations as late as mid-June. The southbound migration commences mid-July and reaches a close in early October.
While migrating, these birds have been reported travelling through middle America, Florida, the West Indies, Cuba, the Caribbean and Bermuda, finally completing their journey in the wintering grounds of South America, primarily Argentina.
As aerial insectivores, the migrants will feed en route, congregating to hunt in marshes, rivers and on lakeshores. In Manitoba and Ontario, Canada, it is reported that during migration the nighthawks are seen most commonly in the late afternoon, into the evening, with a burst of sunset feeding activities.
Additionally, it has been noted that during migration the birds may fly closer to the ground than normal; possibly foraging for insects. There is speculation that feeding also occurs at higher altitudes.
The common nighthawk winters in southern South America, but distribution in this range is poorly known due to difficulties in distinguishing the bird from the lesser nighthawk and in differentiating between migrants and overwintering birds. In some South and Central American countries, a lack of study has led to restricted and incomplete records of the bird. Records do support wintering in Ecuador, Peru, Bolivia, Brazil, Paraguay, Uruguay and Argentina.
Common nighthawk