Why $100 Oil Could Make Flights More Expensive in 2027

Oil above $100 a barrel would not automatically make every ticket more expensive tomorrow. But if elevated oil and, crucially, jet-fuel prices persist, airlines are likely to respond with higher fares, fewer marginal flights and tighter capacity. That is the risk behind Ryanair chief executive Michael O’Leary’s warning that fares could see a “significant uplift” next year. 1

The distinction between a brief spike and a prolonged fuel shock is decisive. Airlines that locked in fuel prices through hedging may be protected temporarily; carriers with more fuel exposed to the spot market face the pressure sooner. Once hedges expire, even well-protected airlines must decide how much cost to pass through to passengers.

Why jet fuel is the real airline cost shock

Crude oil is only part of the airline fuel bill. Airlines buy refined jet fuel, and its price can rise faster than crude when refinery capacity and supply routes are constrained. The difference between crude and jet-fuel prices—the crack spread—is therefore central to airline economics.

IATA said jet-fuel prices had essentially doubled from late February and that the jet-fuel crack spread reached a record $80 a barrel in April. Its 2026 outlook assumed average jet fuel at $152 per barrel, nearly 70% above 2025. 17 In the U.S., reported jet-fuel prices reached $4.04 per gallon on September 8, 62% above the start of the conflict and above many carriers’ third-quarter planning assumptions. 18

That means a move in Brent above $100 can understate the cost problem. Brent rose above $100 on September 9 amid supply concerns tied to the escalating conflict, though it remained below its April peak of $126. 34

Where passengers are most likely to see higher fares

Airlines rarely increase all prices by the same amount. They use revenue management to raise fares first where seats are scarce and demand is least flexible.

Expect the strongest pressure on:

• Holiday and peak-travel dates, when aircraft are already likely to fill.
• Late bookings, when airlines have less need to offer discounts to fill remaining seats.
• Capacity-constrained routes, where there are few competitors or limited available seats.
• Longer routes, where fuel use per trip is greater and alternatives are fewer.

Recent U.S. pricing illustrates how a fuel shock can disrupt the usual seasonal pattern. Hopper data cited by Forbes put the average fall domestic airfare at $326, 39% above the prior year, rather than the typical post-Labor Day decline. 23 That is not a forecast that every fare will rise by 39%; it signals that broadly available low fares can disappear while peak and close-in tickets rise fastest.

Ryanair itself expected July–September average fares to be down by a very low-single-digit percentage year on year, while saying winter pricing depended heavily on oil prices. 1 In other words, weak or uncertain demand can restrain fares in the short term even as fuel costs rise—but that restraint may not last if expensive fuel persists.

Hedging delays the impact; it does not erase it

Fuel hedging lets an airline set prices for part of its future fuel needs. It can soften an immediate shock and create a meaningful competitive advantage over airlines that must buy more fuel at current market prices.

Ryanair cut its fiscal-2027 traffic target to reduce exposure to expensive unhedged winter fuel. It warned that if high oil prices continued through summer 2027, European short-haul fares would increase materially because less-hedged competitors could struggle to maintain capacity or even survive the winter. 2

For travelers, that creates a staggered effect:

1. Initially: better-hedged airlines may hold fares steadier than rivals or use pricing selectively to preserve demand.
2. As contracts roll off: the higher market price increasingly flows into airline costs and ticket prices.
3. If capacity is cut: fewer available seats can reinforce fare increases even if demand is not exceptionally strong.

Airlines are likely to cut low-yield capacity before absorbing all the cost

A sustained fuel shock makes low-margin flights harder to justify. Rather than fly every planned frequency, airlines can remove less profitable routes, reduce off-peak service, consolidate frequencies and direct aircraft toward stronger markets.

Ryanair’s lower traffic target is an example of this defensive approach. 2 The strategy can protect cash and margins, but it also reduces seat supply. In markets where several airlines make similar choices, fewer seats can keep prices elevated.

The impact is likely to be uneven across the industry. Large carriers with liquidity, hedging programs and diversified networks have more options. Smaller, highly indebted or lightly hedged operators may have less room to absorb the shock, particularly during loss-making winter schedules.

Higher fares cannot solve a demand problem forever

Airlines can pass through only part of a cost increase if travelers decide that flying has become too expensive. Leisure demand is especially vulnerable: people can postpone trips, shorten journeys, pick closer destinations or switch transport modes. A weaker economy would eventually affect business travel and air cargo as well.

This is the central tension for the industry. Higher fares can offset some fuel cost, but excessive increases can weaken bookings and load factors. Airlines then face a choice between discounting to fill seats—which hurts yields—or cutting capacity—which constrains growth.

McKinsey notes that research on U.S. airlines has found a typical fuel-cost pass-through of about 70%, though actual pass-through varies by market conditions and competition. 25 That is why fuel inflation is likely to produce a combination of higher ticket prices, slimmer schedules and lower profits, rather than a simple one-for-one increase in fares.

The wider aviation and economic consequences

IATA cut its 2026 global airline net-profit forecast to $23 billion, roughly half its estimate for 2025 and down from a previous forecast of about $41 billion. It cited higher fuel costs and disruption to Middle East air corridors. 30 Its forecast put airline fuel costs at $350 billion in 2026, up from $252 billion in 2025. 30

The broader economic backdrop can compound the damage. Sustained energy inflation raises costs for households and businesses, potentially weakening disposable income and travel demand. A $120-per-barrel oil scenario is not the base case, but Reuters reported that Goldman Sachs saw that level as possible if attacks on shipping intensified. 36 In a separate adverse scenario, Citi estimated that Brent holding at $120 through year-end could reduce global growth to roughly 1.5%–2% while lifting headline inflation toward 5%. 38

What to watch next

The most useful signals are not crude oil alone. Watch:

• Jet-fuel prices and crack spreads: These show what airlines are actually paying for refined fuel.
• How long prices remain high: A short spike is more manageable than a months-long reset.
• Airline hedging disclosures: They indicate which carriers are insulated now and when exposure increases.
• Winter capacity plans: Schedule cuts are an early sign that airlines see the cost shock as durable.
• Booking trends: If travelers pull back, airlines may be unable to fully pass fuel costs on.

The likely outcome of a persistent $100-plus oil environment is not uniform fare inflation. It is a more selective and durable change: fewer cheap seats on high-demand dates, higher close-in prices, trimmed marginal capacity and much greater financial strain on airlines that lack fuel hedges. Ryanair’s warning is therefore less about an immediate universal price jump than about what could happen in 2027 if costly jet fuel becomes the industry’s new baseline. 12