"excursion through" is correct and can be used in written English.
You can use it when you want to indicate a journey through a particular area. For example: "We went on an excursion through the forest."
Full-day excursion through the Scottish Highlands.
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But retro curlicues aside, Eager's excursion through the problems of wishing retains its teasing originality.
What followed was a theatrical excursion through Ukraine from one village festival to another.
Lisa and I chose a rafting excursion through the Chilkat Bald Eagle Preserve.
"Today's magazine is different in countless ways from yesterday's — as even the briefest excursion through this issue will show.
The Web site www.simpatigo.com is very helpful if you're trying to plan a walking or driving excursion through San Francisco.
WINDOW SHOPPING (Mr. Feinblatt): Often on the way back, that might end up being an excursion through what's new in the meatpacking district.
The opening act is an excursion through the northwestern heartland that's being emptied for the industrial zones of the south and east.
The best eco-tourism is found on an excursion through the mangroves to Isla Corazon, which has a large frigatebird colony.
WHAT YOU GET -- A cross-referenced, constantly updated culinary excursion through the place that Ed Norton, of "Honeymooners" fame, once called "the garden spot of the world".
