I'm asking because there is a thing called Click&Rail:
https://www.sbb.ch/imgmyticket/help_faq_e.htm
Geneva-Basel airport and back is CHF 140, a one-way ticket is CHF 76. If you can use Click&Rail, it's CHF 24 one way. Click&Rail trains are usually early in the morning, around noon or in the late afternoon.
On Thursday 26 for example it will be:
Basel SBB 11h24
Genève-Aéroport 14h21
You can book two days beforehand, read the FAQ.
Even if you can use Click&Rail for one way only, it's still much cheaper than a return ticket. This is where you can book tickets:
https://www.sbb.ch/myticket/index.js...sp&language=en
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