A one-way is rarely half a round trip
One-way pricing follows different rules from return pricing, and knowing which rules apply on your route decides whether one ticket or two is the cheaper way to fly.
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What you pay, broken into its parts
Most travel sites show one number and explain it afterwards. Here is the whole of it, before you are anywhere near a payment page.
Why the maths does not halve
On most US domestic routes, carriers price each direction independently, so two one-ways and a return often land within a few dollars of each other. That is the market you are probably flying in, and it means mixing carriers — out on one, back on another — is a genuine option rather than a penalty.
On many international routes the opposite holds. Return fares are filed with their own rules and a minimum-stay requirement, and a one-way can cost sixty to eighty per cent of the return or occasionally more than it. Where that is true, buying a return you do not intend to complete is a rule breach that carriers do act on, and we will not book it that way.
When one-way is the right call
Buy one-way
- Domestic US routes where directions price independently
- You genuinely do not know the return date
- Out and back suit different carriers
- Return is on points, or by another mode entirely
- A relocation with no return
Buy a return, or ask
- Long-haul international where the one-way premium is steep
- A fare requiring a minimum stay to unlock
- Open-jaw — into one city, out of another — which often prices as a return
- Anywhere the one-way quote is more than 70% of the return
Open-jaw, and why a search box struggles
Flying into one city and out of another is an open-jaw, and it is usually filed as a return fare rather than two one-ways. Consumer booking engines either refuse it or price it as two separate tickets, which is frequently the expensive answer.
It is one of the few cases where a fare-construction desk reliably beats a search box, and it is worth a call before you buy two one-ways for a trip that is really one journey with a gap in the middle.
Questions worth asking
Is a one-way always more expensive per mile?
No. On US domestic routes it is frequently half the return almost exactly. The premium shows up mainly on long-haul international fares with minimum-stay rules.
Can I buy a return and skip the second leg?
That is throwaway ticketing, it breaches most contracts of carriage, and airlines do enforce it — by cancelling the remaining coupons, billing the difference or closing a frequent flyer account. We will not construct a booking that way.
Can I fly out on one airline and back on another?
On routes that price directions independently, yes, and sometimes it is the cheapest combination. You hold two tickets rather than one, which matters if the first is delayed — the second carrier has no obligation to you.
Do you charge more for a one-way?
The same published service fee applies per ticket. It is stated before you authorise payment.
Have it priced by a person
You hear the total, the rules and the fee before anything is charged — and if booking direct with the airline is better for your trip, we will tell you that instead.