We paid about $27.50 per adult. It was worth it. As someone else suggested, the Seattle city pass for $90 is a good deal if you are planning to visit the space Needle or the zoo too. Only caveat is that the Seattle city pass is valid for nine days, so you'll have to plan everything in 9 days. Makes sense for tourists, not so much if you are local. Parking costs around $12-18 near the aquarium
If you have a Seattle Public Library card, you can get a free pass for up to 4 people.
The rates are on the website, they vary depending on whether you live in state or not. Approximately 30 for adult with WA ID 35 without. Children under 3 are free and I believe children were 20 with WA ID and 25 without. I can't quite recall, but that seems right.
It's definitely worth the ticket price even if bought individually but it's a better idea to buy a city pass if you are a tourist because with that you can visit five places. Space Needle and Chihuly Garden and Glass can be visited together. Get the harbor cruise upgraded by paying a little extra as that would bring you a unique experience which is not included in the city pass prices. Parking is expensive in Seattle - approx 4 per hour so plan accordingly.
The best thing to do is buy a city pass online for 80 and you can get in for free with it and see other attractions like the apace needle and get a harbor cruise and go to other attractions orherwise its 30 per adult and 20 per kid. The city paas was worth it
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