Every Swellow card we price, most valuable first. Prices are what copies actually sold for, updated daily.
What a Swellow card is worth
The most valuable Swellow on this list is Swellow (Delta Species) from EX Dragon Frontiers at $33.15£24.95€29.19, and the 16 priced copies across 15 sets are worth $139£105€122 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.
Swellow is printed in Japanese as well: 12 cards across 11 sets, the most valuable of them Swellow from Emerald Break at $5.22£3.93€4.60. 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 Swellow sold for $575£432.77€506.38. 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 Swellow 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: EX Dragon Frontiers, EX Emerald, EX Deoxys.