What online and in-person study each assume
Neither is reliably cheaper once everything is counted, and the costs that differ are not the ones in the prospectus.
Published tuition sometimes differs between delivery modes and sometimes does not. What reliably differs is everything around it: travel, housing, equipment, connectivity, and whether the programme expects you to be available at fixed times.
That last point is the one that decides most outcomes. Asynchronous study can be fitted around shift work; synchronous study with fixed class times cannot, and a programme described as online can be either. Ask explicitly.
Enrolment status interacts with both. Studying less than full-time changes cost, timeline and in many cases aid, since some programmes require a minimum enrolment — so the choice of mode and the choice of pace need to be made together.
Work out what a normal week would look like under each option, including the parts nobody publishes: commuting, childcare hours, and where you would actually study.
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Describe what you are trying to work out and a member of the team will answer, or direct you to the office that makes the decision.