Lol--well, our drive home for Christmas is 16. (Done in two days) 10? Cake.
We first flew with DS at 6 months. For about two years, the flight attendants would fawn over him, and welcome him to his first flight. While that is, of course, sweet to do, I was thinking: "no, miss---he's a silver elite flyer." We have flown from the Midwest to Alaska, Maui, and Europe, and tons of times to Florida and elsewhere to visit family.
Our Christmas drive used to be 10 hours in the Midwest. Now that we're in Texas, we did our first big road trip for a month the first summer we were back from Ireland. And the next summer we spent a month driving around Ireland, getting to say a proper goodbye after the end of their pandemic quarantine.
Great tips so far; it brings back a lot of memories. Apologies if some are repeated without citation. I wholeheartedly agree with
@Laura33 's point that vacation with kids is for kids. Just like days spent at home, time together is working time for parents. You won't get to everything you plan; everything is optional, if the kids are in a mindset to enjoy them. Any item on the itinerary can be jettisoned--travel like you are going to come back.
Flying:
Saving money in a number of ways is good, but you can spend some smart money here, too.
Kicking the seat in front of you? Get bulkhead seats. Voila!
While we regulate screen time strictly at home, air travel gets opened up. It's almost inescapable on long haul flights now, anyway. We bring a tablet so that it is available right away, is not interrupted by super load announcements, and has curated content. If they have no screen, they may shoulder surf the row in front of you or across the aisle, and lord knows the rated R movies people in an aisle seat think they can watch!
Bring your own snacks, of course. Not just saving money, but familiar tastes if you have a picky eater. While I firmly believe eating as locals do is part od travel, and DS is an adventurous eater, familiar food is also a way to touch base with home while you're away.
We firmly believe in "pack light," but it was a struggle when DS was a toddler. DW had to ease back from planning for every contingency, to knowing us and trusting there are solutions available in other societies, if needed. But even pound you can shed, you will be thankful for. Know that will mean some cash spent at a pharmacy or supermarket on the road.
On the road:
Quick meals: if you get fast food, take it to a park or playground nearby instead of eating in their dining area. Of course, this expands to other takeout options, too. Play places can also fit, if the weather doesn't allow for that, but DW swears she can see the germs crawling there. Not only is play time a reward and an energy sink, but if you're lucky there are also members of their own kind there, who will interact with your kids. (for free!) And new friendships are a great result of travel, even if those friendships only last for the day.
Add a down day to your trip. You could slog through a 10 hour drive in a day, but giving it two days lowers the tension for everyone, and maybe gives you a surprise to see. We do our 16 hour drive Up North in 2 days, but take a 3rd day in the middle. Wichita is a great overnight stop for aviation enthusiasts! There is something unexpected out there for every interest.
When we are eating out a lot, we rotate turns to "call" the restaurant. Mom and Dad make sure some stops, at least, are nutritious. And kids like to have some control over their circumstances.
Flying is fastest, of course. But driving gives you control. Particularly important in the winter, where leaving a day early or late could save you significant delay and difficulty, due to weather.