Book United Boston to Duluth flight deals from $204

Depart: 03/05/19
Return: 03/19/19

Depart: 03/12/19
Return: 03/26/19

Depart: 03/14/19
Return: 03/28/19

Depart: 03/19/19
Return: 04/02/19

Depart: 03/21/19
Return: 04/04/19

Depart: 03/26/19
Return: 04/09/19

Depart: 04/02/19
Return: 04/16/19

Depart: 04/03/19
Return: 04/17/19

Depart: 04/10/19
Return: 04/24/19

Depart: 04/17/19
Return: 05/01/19