PKM train and SKM to SopotorPKM train to Gdynia, via Osowa?

The short answer

For one traveler the PKM train and SKM to Sopot is cheaper by PLN 4. That does not change up to 8 travelers.

Both are listed at 36 min.

PKM train and SKM to Sopot: 04:25–23:32. PKM train to Gdynia, via Osowa: 03:59–23:48.

Priced against each other

Whole-party totals · adult fares

What each costs for the whole party, in PLN. The cheaper of the two is marked on every row.
Travelers	PKM train and SKM to Sopot	PKM train to Gdynia, via Osowa	Difference
1	PLN 8.50	PLN 12.50	PLN 4
2	PLN 17	PLN 25	PLN 8
3	PLN 25.50	PLN 37.50	PLN 12
4	PLN 34	PLN 50	PLN 16
5	PLN 42.50	PLN 62.50	PLN 20
6	PLN 51	PLN 75	PLN 24
7	PLN 59.50	PLN 87.50	PLN 28
8	PLN 68	PLN 100	PLN 32

Where each one leaves you

PKMSKM · POLREGIO on the PKM line, then PKP SKMPKM train and SKM to Sopot

No bus runs direct from the airport to Sopot.

PKMPKM · POLREGIO on the PKM linePKM train to Gdynia, via Osowa

From: Gdańsk Port Lotniczy station, directly in front of the terminal, on a train towards Gdańsk Osowa
To: Gdynia Główna, after a change at Gdańsk Osowa
Luggage: Luggage rides free on a Taryfa Pomorska ticket.
Runs: 03:59–23:48
Journey: 34–38 min

Board the train towards Osowa, not towards Wrzeszcz: they leave from the same station in opposite directions.