[2] He competed for Finland in the 1912 Summer Olympics held in Stockholm, Sweden, in both the regular and two-handed javelin throw,[3] a one-time Olympic event in which the total was counted as a sum of best throws with the right hand and with the left hand.

Peltonen won a bronze medal in the latter event behind fellow Finns Julius Saaristo and Väinö Siikaniemi and one place ahead of Swede Eric Lemming, who had won the one hand competition.

[4] Eight years later after World War I he again competed for Finland in the 1920 Summer Olympics held in Antwerp, Belgium, where he won the silver medal in the regular javelin as Finland swept the first four places with Jonni Myyrä winning, Paavo Johansson in third and Saaristo in fourth.

[5] After retiring from competitions Peltonen became an official with the International Association of Athletics Federations.

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