The flight on
Singapore Airlines from Los Angeles either goes
non-stop (more expensive) or (if they are still running it) one stop
via Tokyo (cheaper).
No Moscow
No matter which flight you take, you end up connecting with the same Silk Air (subsidiary of Singapore Air) flight to Manado. There are also flights to Manado via Kuala Lumpur on Air Asia.
I prefer the one stop, it gives me a chance to get off the plane for an hour in Tokyo, plus if you are lucky, more people get off at Tokyo then get on, and you may gain a few extra seats to stretch out on and it is cheaper.
One advantage from LA of the Singapore Silkair flight is that the Piece concept ( PC) for baggage (it used to be two bags each up to 50 lbs per bag,
always get current info on baggage allowance as t changes, used to be 70 lbs per bag a few years back) is applied because it is considered a flight from or to North America. The stop in Singapore does NOT matter as it is considered required part of a continuous flight on one ticket (even though you change carriers, Singapore air owns Silk air)
From Singapore Airlines web site
Flights to USA operated by SQ's Codeshare Partners
For flights to/from USA/Canada, the Checked Baggage allowance is for two pieces of Baggage, the weight of each piece of which shall not exceed 23 kilograms (50 pounds)
Silk Air web site explains the weight and piece concepts
SilkAir : where the world unwinds
Singapore Airport is amazing. Free Wifi hot spots, free Xbox games (upstairs from the area near the Orchid Garden in Terminal 2 maybe elsewhere too), free use of internet connected computers in the main areas and even in the departure lounges. Free local calls to Singapore (look for phone on the walls).
Don't miss the Orchid Garden with Koi pond. Each terminal has a few nice indoor gardens. Terminal Two has a rooftop Sunflower Garden which is where the smoking area is located. Also nice to go out to at night for a nap but be aware, all night long security does check passport and boarding passes, so have your papers handy.
But if you were to fly on Malaysian air to Kuala Lumpur and then change to a different airlines say, Air Asia, then the weight concept would apply from KL to Manado which is two bags with total of 20 Kg (or 44 lbs) for economy. This is because it is considered a break in the journey, so once in KL you are no longer considered flying from or to US/Canada.
I don't know the fares now, but a few years ago I got a fare from the Singapore airlines web site that was $45 cheaper than what my friend who works for a major ticket agency in the US could get wholesale. So keep checking.
When you fly LAX to Manado via Singapore Air and Silk Air, you just check your luggage straight thru so you do not have to handle it in Singapore, so bring in your carry on anything you may need in Singapore airport,
There is an
Ambassador Transit Hotel Ambassador Transit Hotel in each terminal on the thrid level that rent small rooms (minimum is 6 hours, and then you can add one hour blocks) as well as a new fancy five star hotel attached to the new Terminal three. To go to the transit hotels you don't leave the airport, you just go upstairs.