Two issues in, we’ve run the math on gas and airfare. Both moved the wrong way. But there’s a move inside the airfare spike that most people miss: when you book two one-ways instead of a round trip, you can mix carriers, mix classes, and find the cheapest seat on each direction independently.
Airlines have known this for decades and built pricing models to discourage it. But in a year where airfare is up 20%+ and route availability is patchwork, the one-way split is worth knowing.
What the math looks like in practice
Here’s a real example of when the split beats the round trip, and when it doesn’t.
Couple · New York to London (international, peak summer)
Round trip vs. two one-ways, economy
| Round trip, United | ~$5,860 |
| Two one-ways (Delta out, British Airways return) | ~$5,520 |
| Savings | +$340 |
Family of 4 · Orlando to Denver (domestic, August)
Round trip vs. two one-ways, economy
| Round trip, Southwest | ~$1,240 |
| Two one-ways, same airline | ~$1,240 |
| Savings | $0 (wash) |
Domestic routes on the same airline: generally the same price. The split-carrier strategy is mainly for international routes and peak-date asymmetric pricing — where outbound and return fares are priced very differently.
Six rules for the one-way decision
01 · International is where the money is. Different airlines own different transatlantic and transpacific routes. Mixing carriers — Delta outbound, British Airways return, for instance — lets you buy the cheapest seat on each leg independently. On domestic routes, most airlines price one-ways the same as half a round trip, so there’s rarely any saving.
02 · Check peak-date asymmetry first. When outbound demand spikes (July 4th weekend outbound, Labor Day return), airlines raise prices on those specific legs. Booking two one-ways lets you pick the cheapest direction from any carrier. Google Flights makes this easy: search one-way for each direction and compare the sum to the round-trip price.
03 · Open-jaw itineraries unlock more savings. Fly into one city, leave from another. Drive, train, or bus between. This is only practical with two one-ways — round trips typically charge a large penalty for open-jaw bookings on a single ticket. Flying Nashville to Paris and returning from Rome to Nashville can cost significantly less as two separate one-ways.
04 · Factor in the connection risk. If one ticket is delayed and you miss your connecting one-way, the airline owes you nothing — they’re separate bookings. Add a flight protection card or travel insurance if the savings are $200 or more. Under $100, it’s usually not worth the paperwork.
05 · Use Google Flights’ “Separate tickets” toggle. Google Flights now flags when booking two separate one-ways is cheaper than the round trip it found. Look for the “Separate tickets” notice in your search results. It’s not always there, but when it is, the savings are usually real.
06 · When one-ways beat round trips on domestic: open jaw. Fly into one city, leave from another. Two one-ways let you do this without the round-trip penalty. Fly Nashville → fly home from New Orleans. Domestically, this is often the only time two one-ways are clearly cheaper than a round trip.
Run the full trip math before you book.
Airfare, cruise, Disney, and all-inclusive calculators with 2026 pricing built in. Points or cash — know the real number first.
Open a calculator →Related reading
- → Road Trip Calculator: Drive or Fly? — runs the real cost of driving vs. flying for any route
- → Vacation Budget Calculator — see what your money actually buys this summer
- → How Much to Budget for Vacation in 2026 — the full breakdown by trip type
- → Card Finder — find the right travel card to redeem on these bookings
Published June 16, 2026. Airfare examples reflect observed fares at time of writing and vary by route, date, and carrier.