Round-trip transit through Canada: does it double transit visa costs?

I am a Romanian passport holder and will be transiting through Canada both ways during a round trip travel between US <-> China. (This is necessary if want to take an affordable Air Canada flight.) To be able to transit, I need to get a Canadian visa.

Question: will I need two transit visas, which effectively double the cost? Is it possible to get a multiple entry transit visa?

There will be 31 days between the two trips.

After a lot of searching, I am unable to find this information on the official website. There are multiple entry visas, but it's not clear if there are multiple entry transit visas, and it's also not clear how much time can pass between the two entries. I am unable to find any contact information (email or phone number) where I can inquire about this. I need to know how much the visas cost to be able to make a decision about which flight to take.

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How much does a transit visa cost for Canada?

There is no fee for a transit visa and you can apply for a transit visa by filling out the application for a visitor visa (Temporary Resident Visa) and selecting transit visa from the list of options on the form.

Do you need a visa for a connecting flight in Canada?

You need a transit visa if you're from a visa-required country and: your international flight stops at a Canadian airport on its way to another country. you'll be connecting between 2 international flights at a Canadian airport. you'll transit through Canada in 48 hours or less.

Do you need a visa when taking a connecting flight?

Re: Do I Need A Visa For A Connecting Flight Through The US? Yes. There is no transit at US airports and you will need to clear both Immigration and Customs at your first point of entry into the US regardless. You will need either an ESTA or a Visa.

What is single and double transit visa?

Transit Visa Single/Double entry visas, valid for a maximum of 15 days, are issued to applicants who would be transiting through India.

Do I Need A Transit Visa If My Plane Has A Stop In The US?

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