Four of the families I am planning for right now are doing both countries on one set of flights. It has gone from something people asked about occasionally to something I am building most months.
The reason is simple. Once you have paid for a flight to that side of the world, adding the second country costs a two hour flight and a few hundred dollars, and the two are different enough that it feels like two trips rather than one long one.
The question is never “should we”. It is “how many days does Korea get”, and that is where people get it wrong in both directions.
Two hours apart, and that changes everything
Tokyo to Seoul is around two and a half hours in the air. Osaka to Seoul is under two. There are dozens of flights a day across half a dozen airlines and the fares are usually modest.
Busan is closer still, and there is a ferry from Fukuoka if you want the slow version.
So the second country is not a big expensive detour bolted onto the end. It is roughly the same effort as an internal flight inside Japan, which is the thing to hold onto when you are deciding how much of the trip it deserves.
Fly into one and out of the other
This is the piece that saves the most and almost nobody sets up on their own.
If you fly into Tokyo and home out of Seoul, you never backtrack. No return leg to the city you started in, no wasted travel day, no second night in an airport hotel you already stayed in.
Airlines call it an open jaw and it usually costs about the same as a return. Sometimes less. The version I see people book instead is Tokyo in, Tokyo out, with a round trip to Seoul stuck in the middle, and that throws away two days and a fare for nothing.
Same logic works the other way. Into Seoul, down through Japan, home out of Osaka.
How many days Korea really needs
This is where I push back on people.
Two nights in Seoul is the number families land on, usually at the end of a long Japan trip, and I understand why. It looks like enough for a palace, a market and a nice dinner.
It is not really enough, and worse, it comes at the point in the trip where everyone is tired and slightly done. Korea ends up being the bit nobody remembers.
If Korea is getting two nights, be honest that it is a stopover rather than a country, put it at the start of the trip when everybody is fresh, and treat it as one great day in Seoul plus travel.
If you want Korea to be a real part of the trip, it needs four to five nights minimum, and that buys Seoul properly with a day trip out of it. Seven to ten gets you Seoul plus Busan or Gyeongju, which is when people fall in love with it.
They are not the same country and the trip should not treat them the same
The mistake underneath the two night stopover is thinking of Korea as Japan with a different alphabet.
Japan rewards moving. The trains are so good that a two week trip through four cities is easy, and the country is set up for it.
Korea rewards staying. Seoul is enormous and layered and you can spend a week in it without repeating yourself, and the country is small enough that most of what you would want to see is a day trip rather than a relocation.
So the two halves of the trip want different shapes. If you plan Korea like Japan, moving every two nights, you will spend the second half of your holiday packing.
Where the food and the kids land
Both countries are easy with children and both have the same essential virtue, which is that you can eat well without booking anything.
The practical differences worth planning around. Korean food is spicier as a default and a child who will happily eat their way across Japan may hit a wall in Korea, so it is worth knowing which of your kids that applies to before you build the days. Korean portions are bigger and shared, so a family of four often orders three things rather than four. And Korea is more stroller friendly than Japan in the modern districts and much less so in the old ones.
None of it is a reason to skip either country. It is a reason to put them in the right order for your particular family.
The order that usually works
Japan first, then Korea, and here is why.
Japan is the harder country to arrive into cold. More etiquette to get wrong, more moving between cities, longer days. Doing it while everyone still has energy is worth a lot.
Korea second gives you the slower half at the end, in one city, when the kids are tired and the adults want dinner and a walk rather than a fourth temple.
The exception is the one above. If Korea is only getting two or three nights, flip it, put it first, and let Japan be the main event it was always going to be.
The part I would think about
The pieces that decide if this works are all booked before you leave. The open jaw, the internal flight, which country gets which half of your energy, and how many nights each one really gets.
Get those four right and it is one of the best trips a family can take. Get them wrong and it is a great trip to Japan with a tired weekend stuck on the end.
If you are looking at both countries and are not sure how to divide it, tell me your dates and who is coming and we can work through it.
Keep reading
The long versions of both countries are here, my Japan family travel guide and my South Korea family travel guide.
Two dates worth checking before you book anything. Japan over New Year, where January 1st is the quiet day, and Seollal in Korea, which moves every year and closes far more than New Year does.
And if you would rather see a good chunk of Japan without packing more than once, I am hosting a 12 night sailing round trip from Tokyo in July 2027, timed to Kyoto’s Gion Matsuri. All five of us are going.
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