Route notes
Why this routing works
This routing starts in Seattle, enters Japan at Nagoya, and uses an overland segment to continue from Nagoya to Tokyo before the next flight south. Building Japan this way can reduce backtracking and lets the ticket cover the long-haul and regional flight structure while leaving one domestic connection on the ground.
From Tokyo, the trip steps through Southeast Asia in a clean southbound sequence: Ho Chi Minh City, Da Nang, and Siem Reap, then returns to Seattle. The stop order keeps the itinerary linear, which is useful on a multi-stop ticket because it avoids unnecessary repositioning and keeps each flight moving forward through the route.
At 3 weeks total, the timing is relatively even across the trip: 5 nights in Nagoya, 4 in Tokyo, 3 in Ho Chi Minh City, 4 in Da Nang, and 4 in Siem Reap. In economy, this fits travelers looking for a compact multi-country itinerary with a defined pace rather than a long open-ended round-the-world plan.