Flight
This is just a link for google flight research, it does not have to find the cheapest, but it's a good starting point.
Flight
Vayama has sometimes a lot cheaper prices than others. It shouldn't be a problem to find a ticket under $600. There is a signing bonus of $10 too. You can just click on the view button and start your research
Flight
Kiwi.com is a great web page for researching any kind of flight ticket from anywhere to anywhere. Last time when I flew from San Francisco to Vienna, I used this page for research and when I saw which ticket is the cheapest, I bought it directly through the webpage of the airline. My price for roundtrip was around $600. If you decide to use kiwi, let us know, I can send you a link for 20 Euros credit.
Flight
Fareboom.com is a webpage that I have never used but I saw a lot of recommendations for it.
Flight
Skyscanner is another webpage for researching tickets, I would again recommend to research here and then to check prices directly through the webpage of the airline that will seem the best for you.
Flight
I am mentioning Norwegian because they have often really good deals from the USA.
Hotel
This place is reserved on Friday and Saturday night for everybody who has to travel for us, it's located approx. 15 minutes car ride from the wedding, cute accommodation in a tiny village in the forest.