Andrey Gyurov and Georgi Kandev will address voters first, followed by Iliyana Yotova and Kiril Valchev. The Central Election Commission (CIK) drew the order by lot at the National Assembly.
The commission had said on Tuesday that the public draw would be held on Wednesday at 10:30am.
More on this story: Election commission draws lots on order of Yotova and Gyurov addresses
The addresses will air on 30 October, the last day of campaigning between the two rounds, on Bulgarian National Television (BNT) and Bulgarian National Radio (BNR). Each pair gets 10 minutes and does not pay for the airtime.
Article 193, paragraph 3 of the Electoral Code gives candidates this right when a new election for president and vice president is held.
Yotova and Gyurov will face each other in the runoff on Sunday, 1 November. In the first round, Yotova and Valchev got 528,951 valid votes and Gyurov and Kandev got 486,232.