The short answer: a passport from an eTA country means an eTA for any trip that connects through a Canadian airport, yet where you meet the border depends on where the next flight goes. Flying on to another Canadian city means you enter Canada at the first airport you land in, and the domestic flight after that needs no eTA; flying on to the United States means U.S. officers inspect you inside the Canadian airport before you board, at the airports that have that arrangement. If you still need the document, you can apply for a Canada eTA via a paid private service that is separate from the Government of Canada, and then read on for your route.
Applying on canada.ca costs only the government fee.
A few travellers skip the eTA entirely: Americans, green card holders (who show the card and their passport) and people with a valid Canadian visa.
Changing planes between two long-haul flights is covered in what happens when both flights are international. Here the focus is narrower: how the destination of the second flight moves the border.
Which connections through Canada need an eTA?
An eTA is required to fly to Canada or to pass through a Canadian airport on the way somewhere else. The length of the stop does not matter, and a short change of planes is treated like a long one.
One more case sits outside the rule: a plane that touches down in Canada purely to refuel on a flight that is heading for the United States or has left it, when the passenger meets the U.S. status conditions. Transit programs that let certain visa-required nationals pass without a visa are for those passports, so they are not a substitute for an eTA.
Coming in by road, rail or sea never calls for an eTA, because it applies to air travel only.
Where in the trip is your eTA checked?
Before you fly. The airline checks it when you check in for the flight that takes you to Canada. Airlines send passenger data to the border agency no later than check-in, and the agency replies with a “board” or “no-board” message before you get on the plane.
So a traveller flying from Madrid to Mexico City through Montreal is checked in Madrid, long before reaching Canadian soil. The eTA is tied to the passport used for the application, which is why the desk asks for the same passport you applied with. If the desk cannot find your authorisation, what to do if the check-in desk can’t find your eTA goes through the usual causes.
Is the next flight within Canada? You enter at the first airport
This is the case most people ask about, and the official pages for travellers say little about it. The border agency does say that on arrival in Canada all travellers present themselves to an officer, with one exception: people moving between two international flights under the transit program at participating airports. A flight to another Canadian city is not that exception.
In plain terms, the entry decision is made at the first Canadian airport where you land. Take London to Toronto to Calgary: the officer you meet in Toronto is the one who lets you into the country, and the Toronto to Calgary flight has no border at all.
An eTA is never needed for a trip inside the country, as Canada’s eTA fact page states. Holding an eTA is not a promise of entry, and the officer still checks your passport and papers.
Luggage is a separate matter. The border agency describes a process for passengers who fly on within Canada after their first point of arrival, and it operates where an airport has agreed to it with the agency. Whether your bags travel through to the final Canadian city depends on the airport and the airline, so ask when you check in.
If you miss the domestic flight after you have already entered, that is a ticket problem for the airline, not an eTA problem. Your authorisation is linked to your passport, so a rebooking does not change it.
One more point for travellers who need a visa rather than an eTA, such as holders of refugee travel documents. The transit visa is written for connections between two international flights, at one or more Canadian airports. If a Canadian city is where your trip ends, or you plan to spend time in the country, that is a visit, and visits call for a visitor visa, however brief. Ask IRCC before booking if this is your situation.
Flying on to the United States: where does U.S. preclearance happen?
U.S. CBP lists preclearance at Canadian airports including Calgary, Toronto Pearson, Billy Bishop Toronto, Edmonton, Halifax, Montréal-Trudeau, Ottawa, Vancouver and Winnipeg. Passengers are inspected before boarding a U.S.-bound flight, so on landing in the United States they skip CBP and TSA.
The Canadian eTA still matters here. It belongs to the part of the trip that goes through Canada, and a plane to the United States that connects in a Canadian airport is exactly that. At Free Flow airports a passenger heading to the U.S. goes straight to the area reserved for U.S. connections, where people and bags are screened a second time and handled by CBP (the layover guide has the conditions). For other airports, whether you clear Canadian border officers before preclearance is not spelled out in the official guidance, so ask your airline.
What the United States demands from you, a visa or an electronic authorisation, is for U.S. officials to say, so check with the U.S. authorities before you book. For a plain-language rundown of who needs a Canadian eTA in transit, this answer on connecting through Canada is a useful read.
Starting in the United States: does time there change the eTA rule?
A U.S. start does not change the eTA rule. If you hold a passport from an eTA country and you are visiting the United States, then connecting through Canada on the way to Europe or Asia still takes an eTA. Time spent in the U.S. does not substitute for it.
The same exemptions apply here: citizens of the United States, green card holders with proof of status, and holders of a valid Canadian visa.
If the onward flight goes to another Canadian city, you are in the same situation as the domestic case above: the first Canadian airport is where you enter. If it goes overseas, the eTA applies as it would for any connection, and your route either follows the Free Flow path or goes through border officers, then back to departures.
There is one narrow exception. If a plane that took off in the United States stops in Canada only to refuel, and you were lawfully admitted to the U.S., no eTA is needed. That is not an ordinary connection, so do not stretch it to a normal change of planes.
Coming back through Canada: does the same eTA cover the return?
A return flight that passes through a Canadian airport is another trip through Canada, so an eTA must be valid on the date of that flight. You do not apply again as long as the authorisation is still alive, because it covers repeated trips.
Its life is five years at most, and it ends earlier if the passport does. If you replaced the passport between leaving home and flying back, you need a new eTA, since the old one is tied to the old passport. How long one eTA lasts is the place to read more. If you are unsure it is still valid, check your eTA status; the page asks for the passport and also the application number or UCI.
The domestic stretch toward your international departure, say Calgary to Toronto before a flight home, needs no eTA. Whether the eTA is needed to leave Canada by air after entering by land is not answered on the government pages, which say only that it is for flying to or through Canada. If you are departing only, ask your airline.
One booking or separate tickets: what changes?
With two separate tickets, each one is judged on its own. If a late first flight makes you miss the second, your eTA is untouched, because it follows the passport and not the flight. A new ticket is something the airline decides, not the immigration system.
When an airline will not move your bags from one ticket to the next, you go through the Canadian border and then on to the departure area, as the layover guide describes. Canada’s transit visa page does not say what separate tickets change, so a visa-required traveller should ask IRCC; an eTA holder does not need a transit visa at all.
Which border do you meet on your route?
| Your connection | Where you meet a border in Canada | eTA needed? |
|---|---|---|
| Overseas → Canadian airport → overseas | Free Flow at YVR, YUL, Toronto T1 when its conditions are met (see the layover guide); otherwise CBSA, then departures | Yes |
| Overseas → Canadian airport → another Canadian city | CBSA at the first Canadian airport; the domestic flight has no border | Yes for the flight in; none for the domestic flight |
| U.S. → Canadian airport → another Canadian city | CBSA at the first Canadian airport | Yes (exemptions as above) |
| Overseas → Canadian airport → U.S. | U.S. preclearance (CBP) before boarding, at Canadian airports that have it | Yes, and the U.S. sets its own rules |
| U.S. → Canadian airport → overseas | As in the first row | Yes (exemptions as above) |
| Return flight through a Canadian airport | Same as the outbound row it mirrors | Yes, valid on the return date |
| Fuel stop only, on a flight to or from the U.S. | No stop at the border | No, if the U.S. visa or admission condition is met |
| Domestic flight to a Canadian hub, then home overseas | No border on the domestic leg | Not for the domestic leg; departure: ask the airline |
If your route has two of these legs, each one applies.
The short version
- A passport from an eTA country means an eTA for every flight that connects in Canada.
- The eTA is checked at check-in for the flight to Canada, before you reach the country.
- Next flight within Canada: you enter at the first Canadian airport, and the domestic flight has no eTA requirement.
- Next flight to the U.S.: CBP preclearance where the airport offers it, and the U.S. authorities answer for U.S. documents.
- A return flight through Canada needs an eTA that is valid on that date and matches your current passport.
- Separate tickets do not change the eTA, which follows the passport.
FAQ
Do I need to go through immigration for a connecting flight in Canada? It depends on where the next flight goes. For a domestic flight you enter Canada at the first airport you land in. If it is bound for the United States, U.S. preclearance applies at Canadian airports that have it. For a flight overseas you either follow Free Flow, where it applies and its conditions are met, or pass the border officers first.
Do I need an eTA for connecting flights? Yes, with a passport from an eTA country, every time you connect in Canada, the way home included. Exempt are citizens of the United States, green card holders who show proof of status, holders of a valid Canadian visa, and passengers on a refuel-only stop under the U.S. conditions.
Do you need an eTA to transit the USA? The eTA is a Canadian document and concerns flying to or through Canada only. Transit rules for the United States come from U.S. officials, so check with the U.S. authorities before you travel.
Is a transit visa required for self transfer? A transit visa exists for people from visa-required countries who cannot get an eTA, which means an eTA holder has no use for it. Canada does not say separately how a self transfer affects the transit visa, so ask IRCC if that is your case.
Do I need an eTA for the domestic flight after I land in Canada? No. An eTA is not needed for travel within Canada. It is needed for the flight that brings you into Canada, and you enter at the first airport where you land.