Is a round trip cheaper than two one-way tickets? It depends where you fly
On some routes a round trip is two one-ways added up; on others a one-way costs nearly as much as both. Here's how to tell, and what to watch for.
It feels like a round trip should be cheaper than two separate one-way tickets — a bulk discount for buying both directions at once. Sometimes it is. Often it makes no difference. And occasionally two one-ways, even on different airlines, beat the round trip. Which one you're looking at depends mostly on the route.
Why the answer changes from route to route
Airlines don't all price a return journey the same way.
- Priced per direction. On many routes — a lot of domestic flying in the US, and most low-cost carriers anywhere — each direction is priced on its own. A round trip costs roughly the outbound plus the return, so two one-ways come out about the same.
- Priced as a return. On many international routes, fares are built around the round trip. There, a one-way can cost close to the round-trip price, and occasionally more, so booking two one-ways can be much more expensive.
There's no reliable rule of thumb for which kind of route you're on. The only way to know is to price both.
How to check in two minutes
- Price the round trip for your dates.
- Price each direction as a one-way, including on airlines that only fly one of the two legs — mixing carriers is where two one-ways most often win.
- Compare like with like: the same bags and seat choices on both sides, since fees are charged per ticket (see whether basic economy is actually cheaper).
What you give up with two separate tickets
Two one-ways are two separate bookings, and the airline treats them that way:
- Changes and cancellations happen per ticket, each under its own fare rules.
- A disruption on one doesn't move the other. If your outbound is cancelled and you decide not to travel, the return is still a separate ticket you hold.
- Two airlines means two sets of policies, for bags, seats and changes.
For a simple trip with fixed dates those trade-offs are usually small. For a trip that might move, one booking is simpler to change.
How we handle round trips and one-ways
Because the two are priced so differently, PriceHash never compares one against the other. When you watch a round trip, you give us a trip length — say, seven nights — and we record the round-trip fare for each departure date we check, with the return that many nights later. Those fares are only ever compared against round-trip fares we've recorded for the same route, departure month and booking window; a one-way watch is compared only against one-ways.
Mixing them would make most round trips look expensive and most one-ways look like bargains, which is exactly the kind of confident, meaningless comparison the score is built to avoid. If you have a trip in mind, watch the route the way you plan to book it.
More field notes
Is basic economy actually cheaper? When the lowest fare isn't the lowest price
The cheapest fare on the screen is often basic economy, and it can cost more than the fare above it. Here's how to compare what you'll actually pay.
Are flight price alerts worth it? What separates a useful alert from noise
Most price alerts tell you a fare changed. That's not the same as telling you it's good. Here's what to look for in an alert before it trains you to ignore it.
Do flight prices drop closer to departure? Why last-minute deals are the exception
Last-minute fare drops are real, which is why waiting for one feels reasonable. Here's why they're the exception on most routes, and what to do instead.