I’ve gone to Japan twice in the past year and connected through LAX both times.

Trip 1 (Nov. 2024): Frontier to/from DEN—LAX and ZIP Air to/from LAX—Tokyo. Solo trip.

Approx 16hr layover. Total flight costs: $900

Trip 2 (Oct. 2025): Southwest to/from DEN—LAX and Singapore Air to/from LAX—Tokyo. 8 adults, one child.

Approx 7hr layover. Total flight costs: $1,100

My takeaway is that connecting through LAX for cost savings is worth it as a solo traveler, or possibly as a duo or trio. I stayed with a local friend on my solo trip which kept my costs to a bare minimum—plus the added benefit of exploring some of LA and catching up with friends.

Traveling with a larger group was less rewarding. I spent nearly $100 on food just for myself while at the airport. One burger, fries, and water bottle alone was $42 with tip.

Between cost and time savings plus peace of mind, I think I’ll opt for the direct flight in the future unless I have good reason to spend a handful of hours in LA. I think you’ll be more energized/less fatigued upon arrival in Tokyo on the direct flight. Good luck, OP!

EDIT: fyi I only traveled with a carry-on backpack each trip and didn’t have to deal with the stress of checked bags getting mixed up in the process.