The 62-Linear-Inch Checked-Bag Limit, Read From the Airlines' Own Pages

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The verdict

1. Sixty-two linear inches is a sum of the bag's three exterior sides, wheels and handle included — and Southwest says so in one sentence: "Wheels and handles should be included when measuring." If the total you measure is over, your two real options are a smaller case or shipping the bag, and a door-to-door luggage shipping quote is worth pricing against the oversize charge, because American's own table lists $30 and $200 as the two oversize fees on its U.S., Puerto Rico, U.S. Virgin Islands and Canada routes.
2. Three carriers publish the same ceiling in different words. Southwest: "62 inches in size (length + width + height)." American: "Oversized items (more than 62 in / 158 cm length + width + height)." Frontier: "62 Linear Inches." Read September 2026.
3. Buy under the line, not at it. A maker's own linear-inch total can exceed the cap while the same page tells you the bag complies — Travelpro's large check-in spinner is the worked example below.

What sixty-two linear inches actually is

Linear inches is not a dimension you can eyeball. It is height plus width plus depth, added into a single figure, and because it is a sum, no individual measurement tells you whether you pass. A case can look entirely reasonable on all three axes and still be over.

What makes the rule bite is which version of each side gets added. Not the packing shell. The exterior, as the bag stands on the floor — over the spinner wheels at the bottom, over the retracted handle housing at the top, and at the widest point of any pocket or lock. Southwest is the clearest US carrier on this point; its checked-baggage article prints the size limit and then, on the next line, "Wheels and handles should be included when measuring."

Which number the carriers count, in their own words

Read in September 2026, three US carriers state the same ceiling and attach it to slightly different apparatus.

Southwest publishes it as a plain pair: a standard size limit of "62 inches in size (length + width + height)" and a standard weight limit of "Up to 50 pounds each," with the wheels-and-handles clause in between. It also states that "Checked baggage fees apply."

American puts the figure in its bag-limitations page as a definition of what it will not carry to certain destinations: "Oversized items (more than 62 in / 158 cm length + width + height)." It is the only one of the three that publishes a metric equivalent next to the inch figure.

Frontier lists it on the bag-options page that also carries its bag-price checker, as "62 Linear Inches" alongside "< 40 LBS" for the same bag. Frontier states the wheels clause for its carry-on — "24in by 16in by 10in and up to 35lb including handles, wheels and straps" — and leaves its checked line as a bare linear-inch figure with no such clause. That asymmetry is worth noticing rather than assuming away: the carrier that is most explicit about wheels on one bag is silent about them on the other.

What happens above the line

The useful thing about American's published oversize table is that sixty-two is not a wall, it is the first of several steps. Its bands are labelled "Over 62 in / 158 cm" and then "Over 65 in / 165 cm," and above that it states flatly: "Checked bags over 115 in / 292 cm in total dimensions (length + width + height) are not accepted."

The fees on those bands, for travel between the U.S., Puerto Rico, the U.S. Virgin Islands and Canada, are listed as $30 and $200, described as "Fees (non-refundable, per person, each way)." And they do not replace the other charges. American's wording: "When a single item exceeds standard dimensions for both weight and size, the higher fee between oversize and overweight applies" — in addition to the checked bag fee itself. A bag that is both too big and too heavy is not one penalty.

A worked example, in the maker's own arithmetic

We are not going to add up your bag for you, because a total we computed would be a number no source printed. Travelpro, unusually, prints its own, which makes its two checked spinners the clearest available demonstration.

On the 25-inch Maxlite 5 medium check-in spinner, the page publishes both measurements — "The case dimensions (the packing body only) are 25 x 18 x 11 in." and "The overall dimensions, which include wheels and carry handles, are 27 x 18.5 x 11.5 in." — and then does the sum: "This bag measures 54 linear inches by case dimensions and 57 including wheels and handles." Wheels and handle raise both the height figure and the total, and the bag stays comfortably inside sixty-two on either number.

On the 29-inch large check-in in the same line, the same page structure produces a different answer. Case dimensions "are 29 x 20.5 x 12.5 in." and overall dimensions "are 31 x 21 x 13 in." Travelpro's own total: "This bag measures 62 linear inches by case dimensions and 65 including wheels and handles."

Then the same page says this: "The standard checked-bag limit on most airlines is 62 linear inches (158 cm). This bag sits within that limit."

Sixty-five is not within sixty-two. And the contradiction is not a matter of interpretation, because the other FAQ on the very same page tells you which number to use: "When airlines publish size limits they mean the overall size, so compare the overall number to your airline's limit." A single product page publishes the right rule, publishes the number that breaks it, and then certifies the bag as compliant. This is the strongest argument available for measuring the case in front of you rather than trusting any published compliance claim — including a maker's own, and including one from the maker that discloses more than its competitors do.

The metric equivalent is consistent, for once

Airline pages often disagree on the centimetre conversion of an inch limit, so it is worth stating the null result plainly: every page we read that printed a metric equivalent gave 158 cm. American's bag-limitations page and its oversize table both do, and Travelpro's product FAQ repeats it. Southwest and Frontier publish the inch figure with no conversion at all. There is no discrepancy here to navigate, which is itself worth knowing.

Measuring it — the part this page will not re-explain

The mechanics of standing a bag on the floor and measuring it the way a sizer would are worked through properly in listed against overall dimensions, which covers the cabin version of exactly this problem, and the enforcement side is in what gate agents actually measure. The short version for a checked bag: stand it upright, measure to the highest fixed point, take width and depth at their fattest, and measure it expanded if it expands, because Travelpro's own guidance is that "Expansion adds packing depth, which also adds to the bag's linear inches and invites heavier packing."

For a quick check against a specific carrier's published box, use our airline sizer tool. Wheel configuration is the variable that moves the height axis most — that trade is worked through in two wheels against four, and the shell and expansion-zipper side of the depth axis is in hard-side against soft-side. For the carriers' cabin numbers rather than their checked ones, see the verified carry-on limits table.

When the total is over

There are exactly three moves, and only one of them is free.

Buy under the line. The size decision is worked through in twenty-five inches against the bigger class, and why the number on the tag is not the number that counts is in listed against exterior on a checked case.

Pay deliberately. Sometimes $30 is simply the cost of the trip, and the only failure is discovering it at the counter. Weight is the parallel trap and the fees stack — see how the overweight bands actually work.

Ship the bag. For an oversize case this is the option most travellers never price. LugLess publishes that "Shipping starts at $25 per bag for domestic U.S. routes" with "no overweight fees up to 100 lbs," while noting that "Final price depends on bag size, weight, distance, and delivery speed" — so a budget shipping quote for your actual route is the only number worth comparing. Luggage Forward, the premium version, states "Our pricing starts at $99/bag." Against a $200 oversize band, per person, each way, that comparison is not close.

What we could not verify

united.com, delta.com, jetblue.com and alaskaair.com returned no readable baggage content to our requests in September 2026 — a protocol error and then a hundred-second timeout with zero bytes at united.com, a closed connection with no document at delta.com, a not-found response on every baggage path we requested at jetblue.com, and navigation-only markup at alaskaair.com. Their checked-bag size limits are therefore not stated here, and the widely repeated claim that "most US airlines" use sixty-two linear inches rests, in this article, on the three carriers whose pages we actually read. Frontier's figures come from a bag-options page with a live price checker attached, so they describe what that page states rather than a flat carrier-wide rule.

FAQ

What does 62 linear inches mean?

It is the sum of a bag's height, width and depth added into one figure, and it is measured on the exterior with wheels and handle included. Southwest states that wheels and handles should be included when measuring. Because it is a total, no single side tells you whether you comply.

How do I measure my suitcase for linear inches?

Stand the packed, closed case upright on a hard floor, measure to the highest fixed point over the wheels and the retracted handle, take width and depth at their widest, then add the three. Measure it expanded if it has an expansion zipper, because that is the size that will actually fly.

What happens if my bag is over 62 linear inches?

You pay an oversize fee on top of the checked-bag fee. American's published table for its U.S., Puerto Rico, U.S. Virgin Islands and Canada routes lists thirty and two hundred dollars across two oversize bands, per person and each way, and it refuses bags above one hundred and fifteen inches in total dimensions entirely.

Do all airlines use the 62-linear-inch limit?

Southwest, American and Frontier all published sixty-two as the ceiling in September 2026, but they attach different weight caps to it and several major carriers would not serve their baggage pages to us at all. International carriers, premium cabins and basic-economy fares can differ, so confirm the limit for the route and fare you booked.