The £90 Packing Error - 5kg Over Could Now Cost More Than Your Flight Ticket

New research compiled by luggage shipping experts Send My Bag has revealed the extraordinary complexity and cost variation facing global travelers who exceed their airline’s baggage allowance.

The study, which analysed over 30 international and regional airlines, found that the cost of being “just a few kilograms over” can vary by as much as 1,000% depending on the carrier’s pricing model. From flat-fee jumps to per-kilogram drips, the data suggests that for many travellers, the baggage check-in desk has become a financial lottery.

Darren Johnston from Send My Bag explains the hidden costs of excess baggage and how confusing it can be for passengers.

Jump vs. Drip Excess Fees

The research highlights two distinct industry approaches to excess weight:

• The “Jump” Model: Major carriers like British Airways, Delta, and Virgin Atlantic typically favour a fixed-fee approach. A passenger might pay a flat fee (eg. £65 or $100) regardless of whether they are 1kg or 9kg over the limit. While this offers a ceiling for heavy packers, it can represent a massive overpayment for those only slightly over.

• The “Drip” Model: Budget and regional carriers like Ryanair, easyJet, and Jet2 often charge per kilogram. With rates reaching up to £12–£18 per kg, a 5kg error can cost nearly £90, sometimes exceeding the price of the flight itself!

Hidden Traps for the Unwary

The data further identifies specific airline policies that can catch passengers off guard:

• The 1.5% Rule: For carriers like Air China and China Southern, penalties are often tied to the ticket price. On a last-minute £1,000 long-haul flight, a single extra kilogram could cost the passenger £15.

• The Regional Trap: Smaller airlines like Australia’s Skytrans or Airnorth may have lower per-kg rates, but their standard allowances are often much smaller (as low as 13kg), meaning passengers enter the “penalty phase” much sooner than on a major carrier.

• The Pre-Book Gap: Airlines such as Jetstar require weight to be booked in 5kg increments. Travellers who fail to pre-book and show up with “un-booked” weight face significantly higher at-the-airport rates.

The Complexity Crisis

Many airlines, including Turkish Airlines and British Airways, now provide excess baggage calculators on their websites. While these tools aim to help, Send My Bag suggests their very existence highlights how difficult it has become for the average consumer to calculate travel costs in advance.

Darren Johnston at Send My Bag commented:

"The sheer volume of variables, from 'Weight Concepts' versus 'Piece Concepts' to route-specific surcharges, means that even the most seasoned travellers might struggle to avoid surprise fees at the airport. Calculators are a helpful sticking plaster, but they underscore a deeper issue: baggage policies have become a labyrinth! 

“Our advice to travellers is to always weigh bags at home using a digital scale before leaving for the airport. If you find yourself in the 'penalty zone,' consider whether shipping your luggage ahead of time is a more predictable, stress-free alternative to the check-in desk lottery."

Global Baggage Penalty Comparison (Selected Data)

Data Insights

The Most Expensive (The Luxury & Long-Haul Giants)

• Emirates (£37.50 / $50 per kg): On certain routes, Emirates takes the top spot for the highest potential penalty. Because they use a "Weight Concept" (where every kilo is charged individually), being 10kg over can cost a staggering £375 ($500).

• Fiji Airways (£26.30 / $35 per kg): Surprisingly high for a leisure-heavy airline, making it one of the most expensive carriers in the world for over-packers on long-haul routes.

• TUI (£18 / $24 per kg): TUI holds the title for the most expensive "standard" budget penalty. While the flight might be a bargain, their £18/kg long-haul rate is a heavy hit for holidaymakers bringing back souvenirs.

The Cheapest (The Consumer Champions)

• Southwest (£3.30 / $2.00 per lb): Despite shifting some policies in 2026, Southwest remains the global leader for baggage-friendly travel. Their excess fees are roughly 5-10 times cheaper than some international counterparts.

• Skytrans (£2.50 / $1.50 per kg): While they have a small initial allowance, their per kg penalty is remarkably low, showing that some regional carriers prioritize affordability for locals over high-margin penalties.

Alliance Airlines (£2.60 / $1.60 per kg): Another budget-friendly outlier in the Pacific region, offering some of the lowest weight-based penalties in the study.