All flights departing from Swedish airports will have an added charge of between 60 to 400 krona, depending on the destination.
"To those who are considering to try to influence the election outcome in our country: stay away!" Lofven said.
The explosion occurred just after midnight in the city centre, which is home to around 100,000 people.
Theodore Tabaro, 49, has been charged with "murder, attempted murder, rapes and kidnappings".
Ygeman reportedly knew about the leak from the national transport agency.
Shocked by Friday's attack that left four dead and 15 injured -- for which a 39-year-old Uzbek man is in custody -- Stockholmers mobilised on Facebook,...
Finns and the French, Swedish full-time employees worked the least in Europe.
Pope Francis expresses deep regret over the conflict between Catholics and Protestants during Christianity's schism five centuries ago.
And ahead of his visit to Sweden, Pope Francis reiterates the importance he attaches to Christian unity.
"The soldiers were on a routine mission and were approached by an unidentified man."
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