Air Transat does not publish a weight limit for your carry-on bag, only a size limit. If it fits the box, it flies, no scale required at the gate.
That is the detail that separates the Air Transat baggage allowance from most transatlantic carriers. Peers usually pair a carry-on size limit with a weight cap near 10 to 12 kg. Air Transat skips the scale entirely, based on what its own site states.
Carry-on size: 55 x 40 x 23 cm
The carry-on limit is 55 x 40 x 23 cm. In inches, that is 21.5 x 15.5 x 9. The figure comes straight from Air Transat’s own baggage page, not copied from anywhere else.
There is no published kilogram or pound cap to go with it.
The personal item rides under the seat
You also get one personal item per passenger. It is sized at 43 x 31 x 13 cm, or 17 x 12 x 5 in. It has to fit under the seat in front of you, not in the overhead bin.
Air Transat does not list a separate weight limit for this piece either.
Checked baggage: 23 kg and 158 cm linear
Standard checked baggage tops out at 23 kg, about 51 lb, per bag. The size limit is 158 cm in linear measurement, about 62 in. That figure adds length, width, and height together.
Go past either number and Air Transat charges a fee, not a refusal.
Overweight and oversize fees hit at the same number
Overweight bags between 23 and 32 kg cost an extra CA$100. Air Transat also lists that fee as US$100. Oversized bags, up to 292 cm or about 115 in, cost the same CA$100 or US$100.
Past those ceilings, Air Transat will not carry the bag at all.
Where Air Transat baggage rules get vague: fare families
Air Transat sells fares like Eco Budget, Eco Plus, and Club Class. Each fare carries its own checked bag allowance. The airline only shows that breakdown through an interactive checker tied to your actual flight, not on a static page.
We could not confirm the standard first and second checked bag fee the same way. Treat those two numbers as open until you run your own itinerary. Check your fare with our baggage cost comparison to estimate what a second bag will run you.
How Air Transat stacks up against other carriers
The Air Transat baggage allowance tracks closely with Air France on carry-on size. Both land near 55 x 40 x 23 cm. They diverge from American Airlines, which caps carry-on weight at 40 lb and actually checks it.
Connecting through a US hub on a codeshare adds risk. Run your bag through our size checker before the two airlines disagree with each other.
What the Air Transat baggage allowance looks like at the gate
Air Transat’s own page never mentions a scale for carry-on bags. Travelers report that enforcement still depends on where you fly from. Accounts describe Toronto departures as relaxed, with staff waving through anything reasonable, while Manchester departures get dimension cages and closer checks.
The most common complaint is not a fee. Several travelers say the 55 x 40 x 23 cm box is tighter than what many suitcases sold as carry-on size are actually built to fit. Treat the published dimensions as a hard limit, not a suggestion, especially on a European departure.
Buying a bag late costs more starting June 2026
Air Transat’s own newsroom confirms a change taking effect June 1, 2026. Any checked bag purchased within 24 hours of departure, online or at the counter, moves to a higher price band. On US routes that last minute price lands around $62.50 for a first bag and $78.25 for a second.
Bookings made before May 15, 2026 keep the old pricing. Buy your bag early and that surcharge never applies to you.
The bottom line
The Air Transat baggage allowance rewards a light touch. Pack a carry-on that fits the 55 x 40 x 23 cm box. You skip the scale entirely, though a station like Manchester may check it anyway.
Checked baggage still plays by normal rules: 23 kg, 158 cm linear, and a flat CA$100 or US$100 fee if you miss either mark. Confirm your fare’s exact bag count with our bag finder before you pack for the gate, and see Air Transat’s own baggage information page for your specific flight.
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