If you hold Canadian citizenship, you enter Canada on your Canadian passport. You do not need an eTA. This rule applies regardless of what other passport you carry. The question most dual citizens actually wrestle with is not which passport to use in Canada — it is which passport to use when leaving the country where you also hold citizenship.
Those two questions sound like one question. They are not, and conflating them is what causes the confusion at check-in.
The Rule: Canadian Citizens Enter on a Canadian Passport, Period
Dual Canadian citizens are required to use a Canadian passport for travel to or through Canada. That’s the whole rule. There are no exceptions based on which other citizenship you hold, how long you’ve been away, or which passport you used last time. The eTA exists for visa-exempt foreign nationals — and as a Canadian citizen, you are not a foreign national. The eTA simply does not apply to you.
This matters practically because airlines run automated checks before they let you board. The airline’s departure control system will look up your passport number against Canada’s entry requirements. If you present your British, Australian, French, or any other passport at check-in, the system will expect to find an eTA linked to it. It won’t find one, because you never needed one. What happens next depends on the agent and the airline, but the outcome is rarely smooth.
The fix is simple: present your Canadian passport at check-in for any flight to Canada. That’s the document that tells the airline and the border system everything they need to know. If you’re unsure how the eTA fits into the broader picture of Canadian entry documents, the Canada eTA vs visitor visa comparison explains the different categories clearly.
The Real Problem: Leaving Your Other Country
Here’s where it gets genuinely complicated. Some countries do not recognise dual citizenship, and a few of them require their own nationals to use their passport when departing. Germany is a well-known example: German law requires German citizens to use their German passport when leaving Germany. The UK has no such rule — a British-Canadian can depart the UK on either passport. But the rules vary sharply by country, and if you hold citizenship somewhere that restricts departure documents, you need to know your specific situation before you pack.
What this means in practice is that you may need to show two passports at the same check-in desk: your other country’s passport to satisfy the departure country’s exit requirements, and your Canadian passport to satisfy the airline’s check-in system for entry into Canada. This is not unusual, and most airline agents have seen it before. The key is being clear about what you’re doing and why.
Travel.gc.ca carries guidance specific to dual citizens, including notes on how different countries treat their own nationals — that’s the right place to look up your specific second country’s rules before you travel.
What to Tell the Airline at Check-In
When you reach the check-in desk, lead with your Canadian passport. That’s the document the airline needs to verify your eligibility to enter Canada. If the agent asks whether you have another passport, or if the departure country’s exit rules require you to show it, you can present both. The sequence matters: Canadian passport first, for the Canada entry check.
If you’re using an online check-in system, enter your Canadian passport details. Some booking platforms ask for a passport number when you buy the ticket — if you entered your non-Canadian passport number there, flag it with the airline before you fly. The discrepancy between the passport on the booking and the one you present at the gate can cause delays, though it’s usually resolvable at the desk.
For anyone who books through a travel agent or corporate booking system, it’s worth confirming that the Canadian passport is the one on record for the flight to Canada. This is the kind of administrative detail that gets missed and then becomes a problem at 5am in a departure terminal.
The Air Canada check-in process with travel documents is worth reading if you want a clearer picture of how airlines handle document verification at the gate — it explains what agents are actually looking for and when issues tend to surface.
If You Don’t Yet Have a Canadian Passport
This is the case that catches people off guard. You’re a Canadian citizen — perhaps you were born in Canada, or you naturalised years ago — but your Canadian passport has expired, or you’ve never applied for one. You’re holding only your other country’s passport and wondering whether you can just get an eTA and use that instead.
You cannot. The eTA is for foreign nationals. As a Canadian citizen, you’re not eligible to apply for one, and even if you somehow obtained one, it would not give you the right to enter as a Canadian citizen. The eTA and Canadian citizenship are separate legal categories.
What you need is a Canadian passport. If yours has expired, renewing it before you travel is the right path. If you’ve never held one and you’re a Canadian citizen by birth or descent, you’ll need to apply — and that process takes time. Passport Canada’s processing times vary, so don’t leave this until the week before your flight.
If you’re uncertain about your citizenship status itself — perhaps you acquired it through a parent and have never confirmed it formally — that’s a separate question that official channels handle. Don’t assume; confirm it before you book.
For travellers who are not Canadian citizens but are wondering about their own entry requirements — particularly those holding US permanent residence — the situation around Canada eTA for US green card holders works quite differently and is worth understanding on its own terms.
The One Mistake That Delays Boarding
The single most common error dual citizens make is applying for an eTA on their non-Canadian passport “just to be safe.” It feels logical: the other passport is the one they use for everything else, they’re comfortable with it, and the eTA application is quick. But this creates a document that you’re not supposed to use for Canada entry, linked to a passport that isn’t the right one for your situation, and it can muddy the check-in process rather than simplify it.
The airline’s system will see a passport number with an eTA attached. The border pre-clearance system will see a Canadian citizen trying to enter on a foreign passport. These two things conflict, and the conflict gets resolved by a human agent who may or may not understand dual citizenship rules quickly. Meanwhile, your boarding time is ticking.
The cleaner approach — and the legally correct one — is to travel on your Canadian passport for the Canada leg of your trip, full stop. If your non-Canadian passport is needed for departure from your other country, carry both, present them in the right order, and explain briefly if asked. That’s a thirty-second conversation, not a problem.
Anyone travelling on a non-Canadian passport who genuinely needs an eTA — perhaps a family member or travel companion who doesn’t hold Canadian citizenship — will find the eTA application straightforward once they’ve confirmed they’re in the right category.
Check that your Canadian passport is valid for your travel dates, confirm the departure rules for your other country of citizenship, and if you’re booking now, enter your Canadian passport number into the booking system as the document for your Canada flight. Those three things cover the vast majority of what goes wrong for dual citizens before they even reach the airport.