Every Staryu card we price, most valuable first. Prices are what copies actually sold for, updated daily.
The same Pokemon is also printed as Misty's Staryu, priced separately because the game treats them as different cards.
What a Staryu card is worth
The most valuable Staryu on this list is Staryu (104) from Skyridge at $95.99£72.25€84.54, and the 29 priced copies across 27 sets are worth $328£247€289 together. Most of that sits in a handful of printings: the older the set and the scarcer the print run, the wider the gap to the rest.
Staryu is printed in Japanese as well: 31 cards across 25 sets, the most valuable of them Staryu from Vending Machine cards Series 3 (Green) at $20.77£15.63€18.29. Switch the list above to Japanese to read those, or to Both to rank the two catalogues against each other.
The highest PSA 10 on record for Staryu sold for $902.36£679.16€794.68. 1st Edition and reverse holo printings are priced separately from the standard card, because they do not trade at the same money.
If you are trying to identify which Staryu you have, the set name is printed on the card and the collector number sits in the bottom corner. Open the card here and the page carries every printing of it, the graded prices, and whether grading the copy is worth the fee. Sets to start with: Skyridge, EX Deoxys, EX Delta Species.