I am a US citizen living and working in Mongolia. I have current valid Mongolian visas in my passport. My passport will expire soon. I may get a new one in the US or I may get a new one through the US embassy in Mongolia.
Can I travel with my old expired passport with the valid visas along with my new passport that have no visa stamps in them yet?
Would this 2 passport travel (old and new) be acceptable?
This is usually accepted by a lot of countries, however it is best to check with immigration in the country in question (i.e. Mongolia) to make sure.
Usually you would not get a visa which would last longer than your passport so I am surprised that you have this problem. But the answer is YES. So long as you have a passport and a visa (wether they are in the same book or not) they are still valid.
I would probably try right there and then in Mongolia, while they won't care much when they are stamping you out, someone might see it as a way to make some quick cash and hold you up.
Try the embassy and see if you can get an emergency passport, its usually issued in 24 hours and might help you out. Though think of something good as they will ask you why you did not get a new passport.
Plain didn't realise it was due would do. Act stupid. Get passport.
If your a full national of the USA getting back should be ok so long as no criminal records etc. Otherwise they might ask questions too.
We had a similar problem in that we ran out of pages in our UK passports a few months ago whilst travelling. We got a new passport but the visa for the country we were in at that time was in our old passport. The embassy we got the new passport at just said we should keep our old passport with us and present it with the new one when exiting/entering a country where a visa was still valid.
The embassy said this is a common occurence and no immigration officer would have a problem with this situation. The embassy was right and we had no problems. Maybe you should check with the US' Mongolian embassy to see if would be a problem for you to do this. The embassy folks are very helpful indeed and will be able to give you all the info you need.