What documents do I need to present at the airport upon arriving in Thailand with a non O-A visa, and how can my wife apply for a non O visa as a trailing spouse?

Given that you are both Canadian.. I'm assuming that you were not married in Thailand.. and unless you have done this already I'd suggest you obtain a translated copy of your marriage certificate.. meaning from English into Thai.. before you travel to Thailand.. this is likely to be needed at some stage of your future dealings with the Thai authorities.. and will probably be less costly to acquire in your home country.. it also removes the inconvenience of trying to get it done here.. especially if you suddenly need to produce it quickly.. just a thought!

Pasport, visa, insurance doc, bording pass

When I arrived on my O-A in July they wanted to see both health insurance documents so they could figure out the expiry date for the stamp……visa expiry or insurance expiry….whatever comes first. BTW if you renew your insurance and arrive back in Th before your visa expiry you get another year (or expiry of insurance).

Pay attention to Ellie and apply for the Non-O for your wife at the same embassy you got your Non-OA from before you leave your home country. Your wife won't get a Non-O visa inside Thailand, nor in any nearby country

You have to show réservation of hôtel or else, nothing much more i think

Q. anything else?

-> You should be good with those (Printed eVisa Non-OA, related insurance policy, passport) in hand physically at the passport control.

Q. she will apply for a non O in Thailand as a trailing spouse/depentant - is the marrage certificate all thats required for the non O for her?

-> Well, sadly she cannot apply for her Non-O dependent on you inside Thailand. Immigration offices don't issue Non-O dependents to retirement visa holders. She must apply for her Non-O outside Thailand. Apply for her visa BEFORE you leave for Thailand through eVisa to the embassy/consulate in Canada using the information of your Non-OA.

They should issue Non-O dependent on Non-OA holders. Check their requirements.

When you two enter Thailand you will be stamped in until your insurance ends (or 365 days if shorter) and she will be stamped for 90 days.

Once in Thailand and when her stamp gets less than 30 days, go to the local immigration office to apply for her extension based on being a spouse to you as a Non-OA holder. Then she will get her extension matching your stamp.

Don't forget to get the latest requirements for her when you are in Thailand and in advance of her application.