Which version of KDE do you have on 11.2 (as your profile indicates is your distro)? If it is 3.5.x, then in Konsole go into the menu thus:
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settings -> font -> select
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After so doing, you'll probably want to do thus:
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settings -> save as default
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KDE4 is somewhat similar, except it shouldn't be necessary to explicitly save as default, and access is via a right click within the window.
KDE5 (Plasma) in Leap 42.2 is like KDE4, except there is no option to make any font bold, a shortcoming of QT5.