Osaka's domestic airport sits in the suburbs much closer to town than Kansai, and almost everyone walking through it is flying within Japan.
Because it is a domestic operation there is no immigration queue: you are off the aircraft and out of the building almost as soon as the bags appear. If your line has been running since the airport you flew from inside Japan, it simply stays with you and needs no attention. Anyone who arrived internationally and connected here should confirm the line is still working before leaving the building, because this is a smaller place with fewer people to ask if something is wrong. The exits toward the transport pick-up points are close and plainly signposted. Give yourself a minute to check rather than discover a problem in a taxi.
Itami is Osaka's original airport, hemmed in by housing, and today it handles domestic services almost exclusively. Foreign travellers who pass through it are usually connecting in from Tokyo or another island rather than entering the country. The building is far smaller than Kansai, and the walk from gate to exit is short by any standard. Its appeal is how quickly you can be out of it, not what is inside it.
On arrival
Because it is a domestic operation there is no immigration queue: you are off the aircraft and out of the building almost as soon as the bags appear. If your line has been running since the airport you flew from inside Japan, it simply stays with you and needs no attention. Anyone who arrived internationally and connected here should confirm the line is still working before leaving the building, because this is a smaller place with fewer people to ask if something is wrong. The exits toward the transport pick-up points are close and plainly signposted. Give yourself a minute to check rather than discover a problem in a taxi.
Where on the way you need your own data
Land
Immigration
Baggage
Wi-Fi with a sign-in or limits
Leave the building
Train or bus to town
Hotel
Airport Wi-Fi only helps while you are inside, and usually behind a sign-in page. The rest of the way to your hotel needs your own data. Install an eSIM before you fly and switch it on at landing.
The Wi-Fi is adequate for a building this size and, because there are far fewer people than at Kansai, often faster than you would expect, though the same terms page stands in the way. The thing to understand is that most people are not inside long enough to get any value from it. If you are connecting with a short wait, leaning on your own line is simply less work than logging in again at every airport you touch in a single day.
Getting into town
The main way out is the monorail that runs along the suburbs and meets the lines heading into central Osaka, with buses straight to the main station district as the other common choice and a reasonable run when the road is clear. A taxi makes far more sense here than from Kansai simply because the distance is so much shorter. Almost the whole route is above ground through residential neighbourhoods, so the signal is continuous with barely a gap. The data you spend on this leg goes on the map and on checking when the next connection leaves, not much else.
What people ask about this airport
Do not confuse it with Kansai: Both get called the Osaka airport in conversation, yet they sit in different directions and a long way apart, so confirm the code on the ticket before you set off.
A domestic connection needs no new line: A line already running in Japan keeps running here on its own; changing airports inside the same country does not call for a new install.
The walk inside is shorter than you plan for: The building is small enough that people reach the pick-up points earlier than their own schedule says, so spend the spare minutes settling the onward route rather than waiting idle.
Plans that work on landing
eSIM plans for Japan
Japan 50GB 30 days
NTT docomo
Works in Japan · your IP shows as Japan
Exits in Japan · NTT docomo
Fixed
Data
50GB
Validity
30 days
Hotspot
Yes
Technology
3G / 4G / 5G
Local IP
5G ready
Hotspot
Validity starts on first connection at the destination
Itami is mainly domestic and very close to the city; Kansai is the international gateway out on an island in the bay with a crossing in between. They are not the same place and they sit on different sides of town.
Do I go through immigration when I land at Itami?+
No, these are domestic flights, so you walk out as soon as you have your bag. That speed is exactly why people connect here when their destination is in the city.
How long does it take to reach central Osaka from Itami?+
Much shorter than from Kansai, whichever of the monorail, the bus or a taxi you choose. That advantage is the main reason people accept a domestic connection instead of landing at the international gateway.
What is the signal like on the way into town?+
Continuous for nearly the whole way, because the route runs above ground through residential districts with plenty of masts. You can leave a map open without worrying it will drop halfway.