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The Korean Linguistics Olympiad, held annually around November, serves as the preliminary competition for national team selection. The number of awards (1st Place, Gold, Silver, Bronze, and Honorable Mention) is determined based on the number of participants. which is up to 100–200. Awardees gain eligibility to participate in the final round (APLO). The competition is conducted virtually with video proctoring and features 6–8 problems to be solved within a 2-hour time limit. The problems are provided in Korean.

The Asia-Pacific Linguistics Olympiad, held annually around April, is the final round for Korea’s national team selection. While it is an international competition involving multiple countries in the Asia-Pacific region, participants take the test simultaneously at their respective national venues. Awards are given to up to 8 participants per country, and awardees are offered the chance to represent Korea at the IOL. Participants can select the working language from the officially provided options, including Korean and English.

The International Linguistics Olympiad is held annually around July–August, bringing together about 200 participants from approximately 40 countries. The competition consists of individual contest and team contest. The individual contest includes 5 problems with a 6-hour time limit, while the team contest features 1 problem to be solved collaboratively by a team of 4 members within a 4-hour time limit.  Each country can send up to two teams. Korea has consistently sent two teams every year since 2008.