The six people who were taken to the hospital with non-life-threatening injuries Saturday night were released early Sunday morning.
The remaining passengers left the plane via air stairs.
Southwest Airlines Flight 822 arrived at BWI from Punta Cana in the Dominican Republic at 7.47pm (local time) with a request that paramedics meet the flight, the airline said in a statement.
In a tweet, BWI said they were investigating the incident.
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Saturday's tsunami hit more than 300 kilometers (186 miles) of coastline with waves of 2 meters (about 6 1/2 feet) or higher. Radar data from satellites, converted into images, shows Anak Krakatoa shrunk dramatically following Saturday's eruption.
While medics were helping the passenger outside the plane, the jet bridge experienced a failure, Southwest Airlines said.
A jet bridge is the enclosed ramp that funnels passengers from the terminal to the aircraft.
Passengers on board the flight involved with the jet bridge incident described the situation as "traumatic".
"Our passengers' safety is the top priority and BWI Marshall Airport has moved quickly to address this issue", Rahn said. This website is not intended for users located within the European Economic Area.