I flew (to MN!) with my little guy when he was five weeks, and I'm so glad we did. Only 3.5 hours of travel time, and I was able to hold him as he happily slept and nursed for the whole flight.
Our friends recently did a west coast road trip with their 11 week old, and they report that the travel was horrible. Their little guy would only tolerate about 45 minutes in the car at a time, and they ended up waiting to drive overnight (rough on them, easier on little guy).
If you can fly, I'd recommend it. Or, does the train run near you? Would take as long as driving but you can interact with the baby the whole trip.
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