Local train to Trondheim SorAtB regional bus 70?

The short answer

For one traveler they cost the same. That does not change up to 8 travelers.

The Local train to Trondheim S is quicker: 38 min against 55 min. The AtB regional bus 70 varies between 52 and 56 minutes.

Local train to Trondheim S: 05:54–23:03. AtB regional bus 70: 05:32–23:02.

Priced against each other

Whole-party totals · adult fares

What each costs for the whole party, in NOK. The cheaper of the two is marked on every row.
Travelers	Local train to Trondheim S	AtB regional bus 70	Difference
1	NOK 50	NOK 50	same
2	NOK 100	NOK 100	same
3	NOK 150	NOK 150	same
4	NOK 200	NOK 200	same
5	NOK 250	NOK 250	same
6	NOK 300	NOK 300	same
7	NOK 350	NOK 350	same
8	NOK 400	NOK 400	same

Where each one leaves you

regional · SJ NORD, on AtB's zone A fareLocal train to Trondheim S

From: Trondheim lufthavn station, platform 1, at the airport
To: Trondheim S, the central station, a short walk from Midtbyen across the canal
Runs: 05:54–23:03
Journey: 25–43 min

On Saturday and Sunday nothing leaves for Trondheim before 09:03; on Sunday the next trains are 11:03 and 13:03.

Buy before you board, in the AtB or Entur app. The conductor sells the same ticket with a surcharge, and takes bank cards only.

The ticket is valid 90 minutes from purchase, which covers the 38-minute ride and an onward bus or tram in the city.

Saturday has gaps: after 17:03 the trains are 19:03, 21:04, 21:48 and 23:03.

70 · AtB, the Trøndelag county authority; run by VyAtB regional bus 70

From: The regional bus stop by the airport's entrance road, a four-minute walk from the terminal
To: Prinsens gate, in Midtbyen by Torvet; about half the trips also call at Trondheim S
Runs: 05:32–23:02
Journey: 52–56 min

Take only buses towards Trondheim (Marienborg): half of the line 70 departures from this stop go the other way, to Stjørdal.

It is the only public transport on a Saturday morning before 09:03, from 05:50; on Sunday it starts at 08:59.

About 55 minutes against the train's 38, for the same fare; it goes to Midtbyen itself rather than the station.

Buy in the AtB app before boarding: the driver charges NOK 20 more.