30-Second Summary
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Bloating while travelling is incredibly common, even in people who don't normally experience digestive problems.
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Flying itself can contribute: as cabin pressure changes, gas in the digestive tract expands, which can leave you feeling noticeably more bloated.
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Changes in food, meal times, sleep, hydration, activity and bathroom habits can also affect digestion and contribute to constipation and bloating while you're away.
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Fibre can help support digestive health — but not all fibres behave in the same way, and some highly fermentable fibres can produce more gas in sensitive people.
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That's one reason we selected Sunfiber® PHGG (Partially Hydrolysed Guar Gum) for The Belly Solution's Probiotic + Prebiotic + Electrolyte Rehydration Formula: it's a soluble prebiotic fibre with a particularly gentle digestive profile.
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PHGG has also been clinically studied for bloating, gas and digestive symptoms.
Quick Answer
Why do I get so bloated when I travel?
Travel can disrupt many of the things your digestive system is accustomed to — your diet, hydration, sleep, movement, meal times and even when you go to the bathroom.
Add a long flight into the mix and there's another factor: lower cabin pressure causes gas already inside your digestive tract to expand.
So if you've ever stepped off a plane feeling as though your waistband has mysteriously shrunk...
It's not necessarily your imagination.
Why This Matters
We talk a lot about travellers' diarrhoea.
But there's another travel gut complaint that comes up surprisingly often:
Bloating.
You leave home feeling perfectly normal.
Then comes the airport breakfast.
Hours sitting on a plane.
Not enough water.
Different food.
Later meals.
Perhaps a few more drinks than usual.
And suddenly your stomach feels decidedly unhappy.
The interesting thing is that travel bloating isn't necessarily caused by one thing.
Usually, several small changes are happening at once.
1. Yes — Flying Really Can Make You Bloated
This one has a surprisingly simple explanation.
As an aircraft climbs, cabin pressure decreases.
When atmospheric pressure drops, gas inside your stomach and intestines expands.
That extra expansion can leave you feeling fuller, gassier and more bloated during a flight.
💡 Did You Know?
The bloated feeling you experience on an aircraft can therefore be partly physical, rather than simply something you ate at the airport.
2. Then Travel Changes Your Normal Routine
Your digestive system rather likes routine.
Travel tends to throw routine out the window.
You may:
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Eat at completely different times
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Eat richer or unfamiliar foods
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Drink more alcohol
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Drink less water
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Sit for hours
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Sleep badly
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Cross time zones
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Ignore the urge to go to the bathroom because you'd rather not use that toilet
Changes in hydration, diet, activity and daily routine can all contribute to travel constipation — and constipation itself can leave you feeling uncomfortable and bloated.
In other words:
Your gut has travelled too.
3. What Does Fibre Have to Do With Bloating?
This is where things become interesting.
Fibre is an important part of digestive health, and certain fibres also act as prebiotics, providing nourishment for beneficial bacteria in the gut.
But different fibres behave differently.
Some are fermented rapidly by gut bacteria, which can produce gas — something people with sensitive digestive systems may notice as bloating or discomfort.
That doesn't make those fibres "bad".
It simply means one fibre won't necessarily suit everybody equally.
And that's something worth considering when you're choosing a product specifically for travel.
4. Why We Chose Sunfiber® PHGG
When developing The Belly Solution's Probiotic + Prebiotic + Electrolyte Rehydration Formula, we didn't simply want to add a prebiotic because "prebiotic" looked good on the ingredient list.
We wanted to understand which one made sense for travellers.
And one consideration stood out:
We didn't want to choose a fibre that could unnecessarily add to the bloating and gas some travellers were already experiencing.
That's one of the reasons we selected Sunfiber® PHGG — Partially Hydrolysed Guar Gum.
Sunfiber® PHGG is a soluble prebiotic fibre derived from guar beans. It's designed to nourish beneficial gut bacteria while having a particularly gentle digestive profile.
PHGG has also been investigated in clinical research, including a randomised placebo-controlled study in which it significantly improved bloating and combined bloating-and-gas scores in people with IBS.
5. What About Inulin and Other Prebiotic Fibres?
Inulin is another widely used prebiotic fibre, and it has an established place in digestive-health products.
But different prebiotic fibres ferment differently, and tolerance varies from person to person.
Inulin and some other short-chain fermentable fibres can be more likely to contribute to gas and bloating in people who are sensitive to FODMAPs.
Sunfiber® PHGG, by comparison, has achieved Monash University Low FODMAP certification, which was another reason its digestive profile appealed to us when selecting a prebiotic for The Belly Solution's Probiotic + Prebiotic + Electrolyte Rehydration Formula.
It's not about saying:
"This fibre is good and that fibre is bad."
It's about asking a better question:
Which fibre makes the most sense for the person — and the situation — you're designing the product for?
For us, that situation was travel.
6. What Can You Do About Travel Bloating?
You can't change cabin pressure.
And we're certainly not going to suggest avoiding every interesting food on holiday.
But a few simple habits may help your digestive system cope with the disruption:
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Keep your fluids up, particularly on long flights
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Get up and move when you safely can
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Avoid suddenly eating enormous amounts of unfamiliar food
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Don't ignore constipation
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Be aware of foods you already know trigger bloating for you
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Maintain some fibre in your diet while travelling
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Consider how well you personally tolerate different types of fibre
Most importantly, don't wait until your gut is completely out of sorts before thinking about it.
Looking after your digestive health can start before you leave home.
Frequently Asked Questions
Why do I feel more bloated after flying?
Lower aircraft cabin pressure causes gas inside your digestive tract to expand. Sitting for long periods, changes in hydration and altered eating patterns may add to the discomfort.
Can constipation cause travel bloating?
Yes. Travel commonly disrupts hydration, diet, activity and bathroom routines, which can contribute to constipation — and bloating can accompany it.
Can prebiotic fibre cause bloating?
Some can, particularly when they're fermented rapidly or consumed in larger amounts. Individual tolerance also varies considerably.
That's why the type of prebiotic fibre matters, not simply whether a product contains one.
Is Sunfiber® PHGG the same as inulin?
No.
They're both prebiotic fibres, but they're different types of fibre with different characteristics.
Sunfiber® PHGG is partially hydrolysed guar gum and has a particularly gentle digestive profile. It is also Low FODMAP certified by Monash University.
Why is Sunfiber® PHGG in The Belly Solution's Probiotic + Prebiotic + Electrolyte Rehydration Formula?
We wanted a prebiotic fibre that would nourish beneficial gut bacteria while being well suited to people who may already experience digestive sensitivity, gas or bloating.
Sunfiber® PHGG's gentle digestive profile was an important part of that decision.
Evidence Snapshot
Last reviewed: August 2026
Prepared using:
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Peer-reviewed research on PHGG, bloating and gastrointestinal symptoms
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Published information on air travel, cabin pressure and digestive changes
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Research relating to travel constipation and changes in digestive routine
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Published information relating to Sunfiber® PHGG and Low FODMAP certification
This article is intended for educational purposes and will be reviewed periodically as new research becomes available.
The Bottom Line
If you feel more bloated when you travel, you're certainly not imagining it.
Flying can physically expand gas within the digestive tract, while changes in food, hydration, movement, sleep and bathroom habits can all add to the problem.
And if you're considering adding fibre or a prebiotic to your travel routine, remember:
Not all fibres behave in exactly the same way.
That's one of the reasons we chose Sunfiber® PHGG for The Belly Solution's Probiotic + Prebiotic + Electrolyte Rehydration Formula — a clinically researched prebiotic fibre selected not just for what it does, but also for how gently it does it.
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