Due to multiple factors, expect to potentially pay more when booking in July. For low rates, February can be a great choice for travel to Fortaleza. Flights to Fortaleza from Baltimore in February are about $1,244 on average during February, but can be found for as low as $718.
Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Baltimore to Fortaleza as you normally would.