Private transfer to InterlakenorIC8 to Thun?

The short answer

For one traveler the IC8 to Thun is cheaper by CHF 226. But at 5 travelers the Private transfer to Interlaken takes over, and at 8 travelers the IC8 to Thun takes over.

The IC8 to Thun is quicker: 1 h 37 against 2 h 30.

Private transfer to Interlaken: hours not recorded. IC8 to Thun: 06:46–18:46.

Priced against each other

Whole-party totals · adult fares

What each costs for the whole party, in CHF. The cheaper of the two is marked on every row. The Private transfer to Interlaken is charged in euros; its column is converted at the reference rate in its fare note.
Travelers	Private transfer to Interlaken	IC8 to Thun	Difference
1	about CHF 294	CHF 68	CHF 226
2	about CHF 294	CHF 136	CHF 158
3	about CHF 294	CHF 204	CHF 90
4	about CHF 294	CHF 272	CHF 22
5	about CHF 294	CHF 340	CHF 46
6	about CHF 294	CHF 408	CHF 114
7	about CHF 294	CHF 476	CHF 182
8	about CHF 588	CHF 544	CHF 44

The cheaper option changes at 5 travelers, from the IC8 to Thun to the Private transfer to Interlaken. The cheaper option changes at 8 travelers, from the Private transfer to Interlaken to the IC8 to Thun. That is the whole reason this comparison is not a single number.

Side by side

Where each one leaves you

transfer · KiwitaxiPrivate transfer to Interlaken

From: Driver meets you in arrivals with a name board
To: Any address in Interlaken
Journey: 150 min

Book at least 16 hours ahead; nearer the day a car is offered only when one is free.

Private transfer to Interlaken: price for every party size

Book transfer through Kiwitaxi

Partner link

IC8 · SBB, on a point-to-point ticketIC8 to Thun

From: Zürich Flughafen railway station, platforms 1 to 4
To: Thun station, by the lake, in 97 to 100 minutes; via Zürich HB and Bern
Luggage: Mainline Swiss trains: racks and standing space by the doors.
Runs: 06:46–18:46
Journey: 97–100 min

The ticket is SBB's, not ZVV's: Zürich Flughafen to Thun, CHF 68.00 an adult, CHF 34.00 for a child of 6 to 15 or with a Half-Fare card, under-6s free. It is cheaper than the CHF 77.00 to Interlaken Ost, which the same train goes on to.

One an hour, at :46, from 06:46 to 18:46. Earlier or later, change at Bern on the same ticket.

The full fare is fixed; the "Supersaver" for one named train is cheaper, demand-priced and refused on any other train, so it is not priced here.

IC8 to Thun: price for every party size

See the fare on sbb.ch

This compares two of 19 options. See all of them ranked for your party size

Private transfer to InterlakenorIC8 to Thun?

Priced against each other

Side by side

The other comparisons at Zurich Airport