Delta personal item size: what fits under the seat

Short answer: a Delta personal item must fit within 18 × 14 × 8 in. The Jelkin 25 is 25 × 17 × 14 cm (about 9.8 × 6.7 × 5.5 in); its longest side is well under Delta's longest allowed dimension of 18 in, and at 14 cm deep it clears any under-seat test, so it qualifies as a free under-seat item.

Delta gives you a carry-on and a personal item on every fare, Basic Economy included, and it publishes one size — 22 × 14 × 9 inches (56 × 35.6 × 22.9 cm) for the carry-on — but no dimensions at all for the personal item. The rule is functional: it has to fit under the seat in front of you.

Delta's carry-on number, and the one it does not publish

The carry-on limit of 22 × 14 × 9 inches is close to the US standard, and the bag must fit in the sizer at the gate, wheels and handles included. There is no published carry-on weight limit across most of the network. On a small number of long-haul international routes Delta does apply a weight cap — the figure most often quoted for mainland China is around 10 kg (22 lb), with a lower one for Singapore — but these are exceptions rather than the rule. If you want to check the figures in both units, the centimetre and inch conversion covers it.

Because the personal item is undefined in numbers, the practical comparison is physical: does it fit under the seat without being forced, alongside the seat rail and, on widebodies, the entertainment box — the same test used in the measuring guide.

25 × 17 × 14 cm under a Delta seat: the edge-by-edge check

With no published figure, measure against the carry-on box instead, since the under-seat space is always smaller than that but not dramatically so on mainline aircraft. The bag's edges are 5.5, 6.7 and 9.8 in; Delta's carry-on is 9, 14 and 22 in. Paired smallest to largest: 5.5 against 9 leaves 3.5 in (8.9 cm); 6.7 against 14 leaves 7.3 in (18.5 cm); 9.8 against 22 leaves 12.2 in (31 cm). In metric terms, 25 × 17 × 14 cm is under half the linear size of Delta's 56 × 35.6 × 22.9 cm box.

The bag is less than half the linear size of what Delta allows in the bin, and comfortably under a fifth of its volume. Window and middle seats have an entertainment or seat-rail box under part of the space on A321neo and A330 aircraft; a 25 cm bag slides past it into the outer half with room to spare.

Basic Economy on Delta still includes a carry-on

Delta is the exception among the big three here. Basic Economy includes a carry-on and a personal item — what you give up is seat selection, changes and boarding position, not your cabin bag. That makes the overhead piece available to you on any fare, which changes how you divide what you carry.

Where Delta does apply a weight limit

Most flights have none. The exceptions are a handful of long-haul international routes, mostly in Asia, where a carry-on weight cap is published and enforced at check-in; the numbers most often quoted are around 10 kg (22 lb) to and from mainland China and lower for Singapore. If you are on one of those routes, weigh your cabin pieces together at home.

A 600 g bag is a small part of either figure. A full 500 ml bottle at roughly 550 g is the item that costs the most weight per litre of usefulness.

Boarding last means the overhead bin fills first

Delta boards Basic Economy in the final zone, which is the practical reason to keep everything you need in the under-seat piece: by the time you board, the bins near your row are usually gone and the remaining space is several rows away. When bins are full, agents offer a free gate-check on most domestic flights, but it means waiting at the jet bridge on arrival. It is the same pattern the airline personal item comparison describes across carriers.

That is the argument for a structured bag. A soft padded bag can be pushed into an odd-shaped gap in a bin; a rigid one usually cannot.

The check to run before you leave for the airport

Pack it, weigh it on kitchen scales, and measure the front panel where the turn-lock sits. Then do the ten-second test: put the bag on the floor and slide your foot under it to where the seat rail would be. If it slides, it will go under the seat. If it catches, take the book out. For a sense of how the 25 cm outer measurement translates to what you can actually get inside, the honest capacity test is the more detailed version. The Jelkin 25 Cloud Bag is 25 × 17 × 14 cm (9.8 × 6.7 × 5.5 in) and about 600 g empty, which is the figure that matters on the routes with a cap.

Allowances change with route, fare type, season and aircraft. The figures below were checked against the airline’s public baggage pages in October 2026 and are given as a guide only — always confirm on the airline’s own site before you fly, and measure your bag packed rather than empty. CloudFlirty is not affiliated with any airline mentioned here.

Frequently asked questions

What is Delta's personal item size?

Delta does not publish one. The bag must fit under the seat in front of you; a 25 × 17 × 14 cm bag does so on every mainline aircraft.

Does Delta Basic Economy include a carry-on?

Yes. Basic Economy includes a carry-on and a personal item; the restrictions are on seat selection, changes and boarding order.

Is there a carry-on weight limit on Delta?

Not on most routes. A few long-haul international routes publish a cap, most often quoted around 10 kg (22 lb) for mainland China.

Will my bag be gate-checked?

If bins are full, agents offer a free gate-check on most domestic flights. Keep documents, medication and electronics in the under-seat bag.

Can I carry a water bottle through security?

Empty it first. A full bottle is about half a kilogram of your weight allowance and it will be confiscated at the checkpoint.

Check it against the others: the airline personal item size checker puts this allowance next to 18 other carriers and tells you whether a 25 × 17 × 14 cm bag passes.

Questions people ask

What is Delta's personal item size?

18 × 14 × 8 in. It must fit under the seat in front of you and is free in addition to your carry-on on qualifying fares.

Does a 25 × 17 × 14 cm (9.8 × 6.7 × 5.5 in) bag fit Delta?

Yes. The bag's longest side is about 9.8 in, shorter than Delta's longest allowed dimension, and at 14 cm deep it sits well under any under-seat test, so it drops in with room to spare.

Does the limit include handles and wheels?

Yes. Delta's personal-item figure is the outside of the bag including handles and wheels.