The 10 Worst Mistakes Budget Travellers Make at the Airport (And How to Fix Them)

Budget airlines are cheap to fly. They're expensive to get wrong. A gate bag fee on Ryanair runs to £63. Buying euros at Gatwick costs you £236 more than buying them online. Missing your flight because security took longer than expected isn't a freak event. It's happened to 7% of UK passengers in a single summer (Which?, 2022). The mistakes aren't random. They're predictable. And most of them are avoidable with a bit of prep.

Here are the ten that cost travellers the most, along with the fix for each one.

Mistake 1: Bringing a Bag That Fails the Gate Sizer

Ryanair pays its gate staff a bonus for every oversized bag they catch, and has increased that incentive over time according to Euronews reporting (August 2025). That's not a passive policy. It's an active enforcement mechanism, and it caught around 200,000 passengers in a single year. Get caught and you're paying up to £63 on Ryanair or £50 on easyJet before you board.

The fix is simple: get a bag built to the free personal item limit (40x30x20cm for Ryanair) and stop gambling on whether your current bag scrapes through. The BRAW Explorer 2 is built to exactly those dimensions and passes the physical sizer — not just on paper, but in practice.

Mistake 2: Paying for a Cabin Bag at the Gate Instead of Pre-Booking

If you need a cabin bag, book it before you travel, not at the airport. Which? research from December 2025 found that Ryanair's advertised lowest cabin bag fee of £12 appeared on just 0.3% of 634 flights checked. The average actual price was £20.50. At the gate? Up to £63. easyJet's advertised £5.99 fee didn't appear once across 520 flights checked. The average was £30, the gate fee is £50.

The advertised price is a headline. The real price is what you pay when you haven't sorted it in advance. Pre-book if you need the bag. Better still, don't need the bag at all.

Mistake 3: Trusting a Bag Labelled "Carry-On Friendly"

A lot of bags are marketed as carry-on friendly, cabin-approved, or airline-compatible. Most of those descriptions mean nothing. There's no standard definition. A bag that fits easyJet's 45x36x20cm free underseat allowance doesn't fit Ryanair's 40x30x20cm free personal item. A bag that passes one airline's sizer may fail the next one's.

The only number that matters is 40x30x20cm, Ryanair's free limit and the tighter of the two main specs. Build your bag choice around that and everything else follows.

Mistake 4: Getting the easyJet and Ryanair Rules Mixed Up

The rules are not the same. easyJet's free underseat bag is 45x36x20cm. Ryanair's is 40x30x20cm. Both are free but different sizes. Both charge for overhead bin access. Both have gate fees for non-compliance. The mistake is assuming that passing one airline means passing the other, or that "I've done it before" is a guarantee it'll work again. Spain fined Ryanair, easyJet, and three other budget carriers a combined €179 million for abusive cabin luggage fee practices in November 2024 (CNBC, 2024). The fees are real, they're enforced, and they're not going anywhere.

Mistake 5: Arriving Late and Underestimating Security

The average UK airport security wait is 19 minutes (Which?, April 2025, based on 7,995 airport trips). 10% of passengers wait more than 15 minutes (UK Government DfT survey, 2024, 15,000+ respondents). And 7% of UK passengers missed a flight due to security queues in a single summer (Which?, August 2022). That's not an edge case. That's roughly 1 in 14 travellers.

The fix: build 90 minutes before departure into your airport arrival time, not the airline's stated minimum. The minimum is for things going smoothly. Things don't always go smoothly.

Mistake 6: Leaving Liquids in Your Bag at Security

UK airport security confiscates items estimated at £306 million in value each year, across an estimated 10 million people (Direct Line Travel Insurance research, 2017; passenger volumes have grown substantially since). The most common cause is simply forgetting to remove items before going through. 27% of those who had items confiscated said they forgot. 25% didn't realise they had a prohibited item at all.

The fix: clear out your liquids bag the night before. Keep it at the top of your pack, accessible in under 10 seconds. The Wee Braws toiletry bag sits at the top of the Explorer 2 exactly for this reason.

Mistake 7: Overpacking and Paying to Check a Bag You Didn't Need

Research suggests a significant proportion of travellers return home with clothes they never wore. For short breaks, checking a bag is almost always unnecessary and it adds cost, waiting time at the carousel, and the risk of it going missing. A return checked bag on Ryanair costs £38–120 depending on when you book. That's money spent solving a problem that didn't need to exist.

The solution is to commit to hand luggage only. It takes one or two trips of doing it properly to stop thinking about checked luggage as the default.

Mistake 8: Buying Currency at the Airport

Exchanging £1,000-worth of euros at a UK airport costs an average of £182 more than using a high-street currency exchange, according to research by eurochange in September 2025. At Gatwick, the worst-performing UK airport, the premium is £236. The same £1,000 trip budget buys noticeably less holiday at those rates.

The fix: order currency online 2–3 days before travel, or use a fee-free travel card (Starling, Wise, Monzo) for spending abroad. Don't leave it to the airport desk.

Mistake 9: Not Downloading Your Boarding Pass Offline

Airport Wi-Fi is unreliable. Roaming data doesn't always kick in immediately. The moment you need your boarding pass is the moment your phone decides to stop cooperating. Screenshot it, download it, or print it before you leave the house. It takes 30 seconds and eliminates an unnecessary point of failure.

Mistake 10: Missing the Boarding Call

This one sounds obvious, but 71% of British holidaymakers find at least one part of the airport experience stressful (YouGov, 2025). Distraction is part of the environment: food, shops, comfortable seating. Gate changes happen. Boarding calls are easy to miss if you're not paying attention. Set a phone alarm for 45 minutes before your stated departure time and get to the gate before it goes off.

The Common Thread

Most of these mistakes share the same root cause: not sorting things out in advance. The fee isn't a surprise. The security queue isn't a surprise. The airport exchange rate isn't a surprise. They're predictable costs that hit people who haven't planned for them.

The bag is the one you can fix permanently. One bag built to the right spec and the gate fee problem goes away entirely, for every trip. The BRAW Explorer 2 (£135) passes Ryanair's 40x30x20cm sizer, easyJet's underseat limit, Wizz Air, Jet2, and Vueling. Never pay a gate fee again.

Frequently Asked Questions

How much is a gate bag fee on Ryanair in 2026?

Ryanair's gate fee for a non-compliant or oversized bag is up to £63 (€75) per bag. This applies if you arrive at the gate with a cabin bag you haven't paid for, or a bag that doesn't fit the free personal item sizer (40x30x20cm). Ryanair has increased staff incentives for catching oversized bags, according to Euronews (August 2025), so enforcement is commercially motivated, not random.

What's the most common mistake at airport security?

Forgetting to remove liquids and restricted items before going through. Research found that 27% of passengers who had items confiscated simply forgot to remove them, and 25% didn't realise they had a prohibited item at all. Keep your liquids bag at the top of your pack and accessible in under 10 seconds. It makes the security tray process significantly faster.

Is it cheaper to buy currency at the airport?

No, it's significantly more expensive. Exchanging £1,000-worth of euros at a UK airport costs an average of £182 more than a high-street exchange, according to eurochange research (September 2025). At Gatwick, the gap is £236. Order currency online before you travel or use a fee-free travel card instead.