Bus 43 to VejleorAirport bus 912X to Aarhus?

The short answer

For one traveler the Bus 43 to Vejle is cheaper by DKK 102. That does not change up to 8 travelers.

The Bus 43 to Vejle is quicker: 28 min against 1 h 27. The Airport bus 912X to Aarhus varies between 73 and 96 minutes.

Bus 43 to Vejle: 06:10–23:55. Airport bus 912X to Aarhus: 08:00–02:30.

Priced against each other

Whole-party totals · adult fares

What each costs for the whole party, in DKK. The cheaper of the two is marked on every row.
Travelers	Bus 43 to Vejle	Airport bus 912X to Aarhus	Difference
1	DKK 64	DKK 166	DKK 102
2	DKK 128	DKK 332	DKK 204
3	DKK 192	DKK 498	DKK 306
4	DKK 256	DKK 664	DKK 408
5	DKK 320	DKK 830	DKK 510
6	DKK 384	DKK 996	DKK 612
7	DKK 448	DKK 1,162	DKK 714
8	DKK 512	DKK 1,328	DKK 816

Where each one leaves you

43 · SydtrafikBus 43 to Vejle

Make sure the bus is going to Vejle: the 43 calls at the airport in both directions.

After the last 43, the 912X calls at Vejle Trafikcenter at 01:30 every night and 03:00 on weekdays, for DKK 86.

912X · MidttrafikAirport bus 912X to Aarhus

From: The bus stop at the entrance to the terminal
To: Aarhus Banegårdspladsen, in front of Aarhus H, then Aarhus bus station
Luggage: A coach with a hold; four seats at the front have Isofix fittings, and you bring your own child seat.
Runs: 08:00–02:30
Journey: 73–96 min

Some runs stop at Skanderborg and Østerlund and take up to 1 hour 35; the direct ones take about 1 hour 15.

Nothing leaves the airport for Aarhus between 02:30 and 07:00 at the earliest.