Most common way to travel to Poland from Norway will be by air, the closes airport is Szczecin http://www.airport.com.pl/en/ and is about 70km from Trzesacz
The airlines operating on this airport are:
norwegian https://www.norwegian.no/
ryanair https://www.ryanair.com/gb/en/
All those airlines having some flights from Norway to Poland, everything depending on your preferences and budget, I am sure you will find what you are looking for. (transportation from airport will be in another post)
The other relatively close polish airports are:
Bydgoszcz http://plb.pl/en
However i have never use those airports (OK, maybe Warszawa once :), so it might be more difficult for me to help you if you decided to travel there.
Another convenient airport to travel for our wedding will be Berlin, Germany. And Berlin is about 250 km from Trzesacz https://www.google.no/maps/dir/Berlin,+Germany/Trz%C4%99sacz,+Poland/@53.2731299,13.0779249,8z/data=!4m13!4m12!1m5!1m1!1s0x47a84e373f035901:0x42120465b5e3b70!2m2!1d13.404954!2d52.5200066!1m5!1m1!1s0x47aa9d8659f47b7b:0x72cb714657a8a582!2m2!1d14.9932359!2d54.0761939?hl=en
Berlin have two operating airports
Berlin TEGEL http://www.berlin-airport.de/en/travellers-txl/ and here by air you can travel with SAS http://www.sas.no/
Berlin Schönefeld http://www.berlin-airport.de/en/travellers-sxf/, here you can travel with Norwegian https://www.norwegian.no/
I am pretty sure that both of those airports cooperating with many more airlines, I just have never tried, so i can't recommend it. (transportation from airport will be in another post)
Hopefully Helpfull ;)
Katarzyna and Sindre