# What Are the Carry-On Size Limits by Airline in 2026?

Liam Crawford · October 1, 2026

> Carry-On Size Limits by Airline: The Direct Answer Carry-on size limits are set by airlines, not by one worldwide authority, and the exact allowance...

## Carry-On Size Limits by Airline: The Direct Answer

Carry-on size limits are set by airlines, not by one worldwide authority, and the exact allowance varies by airline, fare class, route, and sometimes aircraft. As of October 1, 2026, a widely used allowance for U.S. and Canadian carriers is approximately 22 × 14 × 9 inches, including wheels, handles, side pockets, and sometimes the bag’s rigid frame. That converts to about 56 × 36 × 23 centimeters. This is the familiar U.S. domestic standard used by American Airlines, Delta Air Lines, United Airlines, Southwest Airlines, Alaska Airlines, JetBlue, and Spirit, although an airline can publish exceptions or change a policy without making the 22-inch rule universal internationally.

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International and low-cost airlines frequently use smaller metric allowances. Common limits include 55 × 40 × 20 centimeters or 55 × 40 × 23 centimeters, while some budget carriers allow only 55 × 40 × 15 centimeters or even 40 × 30 × 20 centimeters. Ryanair, for example, generally offers a small cabin bag and a larger priority cabin bag under its published fare structure, while easyJet uses a weight-based cabin-bag system with a typical maximum of 15 kilograms. British Airways and many European carriers also distinguish between larger carry-on bags and smaller underseat bags. Therefore, a bag that passes the TSA-style checkpoint sizer in the United States may still be too large for the operating airline’s cabin.

The essential rule is to measure the outside of the packed bag and compare all three dimensions with the airline’s published limit. A 22 × 14 × 9-inch bag is a useful baseline, not a guarantee of acceptance. Airlines may apply stricter limits to basic Economy, Light, Low Cost, or similar fares, and codeshare flights can be operated by a carrier with different rules from the ticket’s displayed marketing airline.

| Bag type | Common U.S. domestic allowance | Common international allowance | Main risk |
| --- | --- | --- | --- |
| Standard U.S. carry-on | Up to 22 × 14 × 9 in | 56 × 36 × 23 cm is common but not universal | Airline may apply a stricter fare or aircraft rule |
| Small underseat bag | Usually 22 × 14 × 9 in or smaller | Often 40 × 30 × 20 cm or 55 × 40 × 20 cm | May be the only included cabin bag on a low-cost fare |
| Budget-airline cabin bag | Policies vary widely | Often about 55 × 40 × 20 cm | Priority purchase may be required |
| Personal item | Frequently included separately | Frequently required to fit under the seat | Overhead-bin bags may be prohibited |
| Weight-limited cabin bag | Usually no standard U.S. weight cap | Often 7–10 kg | Scale exceeds allowance even if dimensions pass |

## Why Airline Carry-On Rules Differ
Airlines set cabin-baggage limits mainly because aircraft cabins, overhead bins, and safety procedures are not physically identical. A regional jet may have fewer overhead-bin spaces and smaller bin openings than a wide-body aircraft, while a dense Airbus A320 or Boeing 737 configuration can leave limited room for larger suitcases. Budget airlines may also use smaller bins deliberately, turning a generous physical allowance into a paid priority product. The limit therefore reflects both operational reality and commercial policy rather than a single aviation standard.

Weight is another reason the rules differ. Most U.S. carriers rely primarily on dimensions and do not impose a universal carry-on weight maximum, though individual routes, premium products, or operating partners can differ. Many international and European airlines do publish weight limits, commonly 7 kilograms or 10 kilograms. An empty underseat bag can pass the airport security sizer and still be rejected at boarding if it weighs more than the airline’s allowance. This distinction matters most on flights departing airports where airline staff actively enforce the cabin allowance.

TSA screening policy is separate from airline baggage policy. TSA generally permits a carry-on that fits within its checkpoint screening area, while the airline decides whether that bag is accepted into the cabin. Reports about new TSA scanners have caused confusion because scanner technology can change how passengers are screened without changing every airline’s size allowance. TSA’s security mission and an airline’s obligation to manage limited cabin storage are different functions. Passing through TSA does not mean the bag is free to board, and failing to fit at TSA does not necessarily determine the airline’s final allowance if airport staff permit an alternate screening procedure.

The consequences are also asymmetric. Airlines can require passengers to check an oversized bag, remove items to another bag, or pay a gate-checking charge. The fee may be a standard checked-bag price, a higher cabin-bag fee, or an international or regional charge. Checking a compliant-looking bag at the gate is not merely a convenience; it can cost substantially more than checking it online in advance and may reduce the amount of time available to repack.

## Major Airline Limits and Useful Benchmarks

The 22 × 14 × 9-inch benchmark remains useful for many major U.S. airlines, but it should be treated as a starting point. American Airlines generally permits a carry-on within that size under its standard allowance, while business and first-class passengers may receive additional allowances on eligible flights. Delta similarly uses the familiar U.S. domestic dimensions for its standard cabin allowance, but its published rules can vary by fare and route. United uses 22 × 14 × 9 inches for many main-cabin itineraries, while United Express and some regional or international products can have different rules. Southwest is known for allowing relatively generous cabin luggage, but the operating carrier and fare still matter.

Alaska Airlines, JetBlue, Hawaiian Airlines, and Air Canada commonly use the broad U.S. and Canadian benchmark for standard carry-ons, yet each publishes separate conditions for basic fares, codeshare flights, and selected routes. Air Canada may also distinguish between a carry-on bag that fits under the seat and an overhead-bin bag, which makes a single measurement misleading. Spirit and Frontier, as low-cost carriers, may separate a small personal item from a larger cabin bag and may charge for the latter on some fares. Frontier’s published allowance and Spirit’s fare structures have changed over time, so travelers should not rely on an old chart without checking the booking.

International airlines add more variation. Lufthansa, Air France, KLM, British Airways, Emirates, Qatar Airways, Singapore Airlines, and Japan Airlines may use allowances ranging from a single underseat item to a larger overhead-bin bag, often measured in centimeters and kilograms. Some premium cabins receive two pieces, while economy travelers may receive one. Connecting flights can create a “worst case” problem: a bag accepted in the airline’s primary hub may be too large for a smaller aircraft or a different operating carrier on the next segment. Measuring against the strictest allowance in the itinerary is safer than assuming the first airline’s rule governs the entire trip.

A practical benchmark is 22 × 14 × 9 inches for a likely domestic bag, 55 × 40 × 20 centimeters for a likely international small cabin bag, and 55 × 40 × 23 centimeters for a more generous international allowance. These are not promises of acceptance. They are planning ranges that make it easier to recognize whether a bag is oversized before arrival at the airport.

## How to Check the Correct Limit Before You Fly

Begin with the operating airline and the exact booking, not merely the airline shown in a search result. Open the itinerary, identify every flight number, and check whether any segment is operated by a partner. Search the airline’s official “baggage,” “carry-on,” or “cabin baggage” page using the departure airport, destination, fare name, and travel date. A codeshare itinerary can list one airline for the ticket but use another airline’s aircraft and baggage policy, especially on regional flights.

Next, separate the allowance into categories. Confirm whether the fare includes an overhead-bin carry-on, only an underseat personal item, or a combination of both. Look for weight, number-of-pieces, and fare restrictions. If the airline provides a bag sizer, note its internal dimensions rather than adding space around the bag; the bag must fit without forcing, compression, or removing an essential part. Measure packed bags at their largest point, including wheels and handles, because soft-sided luggage can appear compliant when empty but expand when full.

For a typical itinerary, travelers should check the airline website at booking, then recheck approximately 48–72 hours before departure and again 24 hours before leaving for the airport. This interval is long enough to identify a codeshare or fare-specific condition but short enough to react to a temporary policy change. Checking only weeks earlier is risky because airlines can adjust allowances for aircraft swaps, seasonal schedules, and fare products. The final check should be done on the airline’s site or app rather than through an outdated third-party chart.

If the bag is only slightly over the limit, repacking it at home is usually more predictable than relying on airport discretion. Remove shoes, liquids, and nonessential layers, use compression packing carefully, and measure again. Do not assume that a soft bag can be compressed at the gate or that an attendant will accept it because another passenger had the same bag. The best preparation is a bag that passes every applicable airline limit without negotiation.

## Cost, Alternatives, and When to Check a Bag

Carry-on bags are not universally free. U.S. full-service airlines commonly include one standard carry-on and one personal item for many economy fares, while basic economy, ultra-low-cost, and some regional products may charge for either item or exclude one entirely. International carriers may include an underseat bag but charge for a larger cabin bag, or may provide two pieces only to business and first-class customers. Fees can range from free to roughly $10–$75 for a cabin bag, while gate-checked baggage charges may be higher than advance online fees and can also expose the traveler to delay or loss.

Checking in advance is usually cheaper than deciding at the gate. Airlines often price checked bags online at a lower amount than the airport rate, and some carriers count a gate-checked carry-on as the first checked bag. For a trip involving several airlines, the cost of two checked bags can become $100–$300 or more, depending on international segments and carrier-specific charges. A second bag, a box for purchases, or sports equipment may require a separate fee or special handling. Travelers should calculate the total itinerary cost rather than comparing only the first flight.

A personal item can be a useful alternative when the itinerary includes a small regional aircraft or a basic fare. An underseat bag is usually easier to control because its dimensions and weight are more predictable, but it must also fit beneath the seat in front of the traveler and must not obstruct the aisle or safety area. Buying a new bag solely to meet one airline’s rule is rarely economical unless it replaces several noncompliant bags. In many cases, transferring items into an existing backpack, measuring it, or checking one bag online is the less expensive solution.

When the itinerary is short, the bag is comfortably under the published limit, and no aircraft swap is likely, carrying on can preserve time and avoid checked-bag fees. When the trip includes a basic fare, a codeshare, a low-cost segment, or an uncertain connection, checking the bag at home or in advance is the more reliable choice. The cost difference should be weighed against the risk of paying a gate fee, missing a connection, or losing access to an item during the flight.

## Common Mistakes That Cause Unexpected Fees

The most common mistake is treating TSA’s screening dimensions as the airline’s baggage allowance. TSA is responsible for security screening, while the airline controls cabin-bag acceptance and storage. A bag can pass TSA and still be too large for the airline’s overhead bin, especially on a low-cost or international flight. The reverse is also possible: a bag may be slightly larger than the security sizer but be handled through an alternate screening process, although that does not guarantee airline acceptance.

Another mistake is measuring only the main compartment. Wheels, handles, feet, side pockets, and protruding frames can add inches or centimeters. The bag should be measured when fully packed, not loosely flattened. Travelers also forget that a personal item and an overhead carry-on may be counted separately, or that a fare may permit only a small underseat bag. Checking the fare name is therefore as important as checking the airline name.

Many problems come from assumptions about codeshares. A booking may display a major airline’s name while the flight is operated by a regional carrier with a smaller allowance. A traveler may also assume that the most generous allowance on a multi-city itinerary applies everywhere. The correct approach is to identify the operating carrier for every segment and use the strictest relevant limit. Finally, travelers underestimate how quickly an apparently small bag becomes oversized after adding a laptop, camera, or duty-free purchases.

The safest habit is to leave a margin rather than aim for the exact threshold. A bag that measures exactly 22 inches can be affected by measurement methods, bulging pockets, or a different sizer at the destination. A few centimeters of unused space is not “wasted” if it removes the possibility of a gate check. It is also wise to photograph the airline’s current policy and save the confirmation, especially when traveling on an international route where fees and currency are harder to dispute.

## The Best Planning Rule for 2026 Travel

The most useful answer is conditional: use 22 × 14 × 9 inches as the default for many U.S. domestic flights, but verify the specific airline, fare, route, and operating carrier. For international travel, compare the bag with common 55 × 40 × 20-centimeter and 55 × 40 × 23-centimeter limits, and check whether weight is capped at 7 or 10 kilograms. If the bag fails any one allowance, it is not a reliably compliant cabin bag for that itinerary.

The distinction between a carry-on and a personal item should be made before packing. A backpack may qualify as a personal item even when a roller bag is oversized, or it may be too large if it cannot fit under the seat. Two-piece allowances, premium-cabin benefits, and route-specific rules should be confirmed rather than inferred from a general airline chart. Tables and rankings are helpful starting points, but official booking and baggage pages control the practical decision.

For a future trip, the best sequence is to check the itinerary, read the fare-specific baggage policy, measure the packed bag, repack if necessary, and purchase any needed baggage service online before arriving at the airport. This process takes perhaps 10–15 minutes and can avoid a surprise charge of $50–$100 or more on a single segment. It also protects the traveler from the operational consequences of an aircraft change, especially during a busy travel period.

Carry-on baggage is often presented as a simple right, but it is actually a set of route- and ticket-dependent permissions. The 22-inch rule remains a valuable U.S. benchmark, while international and budget-airline policies can be substantially different. Treating the airline’s current policy as controlling evidence—not a scanner rule, a cabin-bag anecdote, or an old travel article—is the most reliable way to keep the bag with you in 2026.

## Quick answers

### Is 22 × 14 × 9 inches allowed on every airline?

No. It is a common allowance for major U.S. carriers, but international, low-cost, regional, and codeshare flights may use smaller dimensions or impose weight limits. Check the fare-specific policy for every operating airline in the itinerary.

### Can TSA make me check my carry-on bag?

TSA generally controls security screening, while the airline decides whether a bag is accepted into the cabin. A bag may pass TSA and still be gate-checked for being too large, too heavy, or incompatible with that flight’s overhead-bin space.

### What is the usual international carry-on size?

A common international allowance is 55 × 40 × 20 centimeters or 55 × 40 × 23 centimeters. Some airlines instead allow only a smaller underseat bag, and many publish weight limits such as 7 or 10 kilograms.

### Is it cheaper to check a bag at the airport or online?

Checking online is usually cheaper because airlines often apply a lower advance fee than the airport rate. Gate-checking can also be more expensive because it may be charged as a checked-bag fee and can leave less time to repack.

### How far ahead should I check airline baggage rules?

Review the policy when booking, again about 48–72 hours before departure, and once more shortly before leaving for the airport. This helps identify fare restrictions, codeshare operations, aircraft changes, or temporary policy updates.

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