What discount do I get by using my Eurail pass going to the Jungfrau and will it cost me a days travel
You will get a 25% discount between Interlaken and Jungfraujoch. You don't need to use a travel day for such discounts. More information is available through myswissalps.com/ eurailselectpass/ validity.
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Swiss Travel Pass promotion 25% discountOnly if purchased in July 2021. Free cancellation.Buy via the SBB travel centre at https://shop.switzerlandtravelcentre.com or HappyRail at https://www.happyrail.com/swiss-travel-pass.