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Be sure to compare rental car prices between the airports you are considering.

The lower areas of Yellowstone are about the same as, or a little lower than, the South Rim (give ot take 7000 feet) . . . but on average, Yellowstone is 8000 and it goes up from there.

Some folks...

Just a note from one who lives at sea level (NJ) . . . elevations at YNP start high and go higher. Expect to feel more tired, plan to drink a lot of water, wear sunblock (i was there in the fall and...