How much does changing your dates really save?

Everyone says to move your dates around. So we tested it properly. Same trip, same length, same airline options, we only changed the departure day, across a week on Google Flights with the nonstop filter on. We ran it on three very different routes, and the answer ranged from "a bit" to "over a thousand pounds" to "almost nothing."

🔎 ToolGoogle Flights, nonstop only

📅 MethodSame trip, one price per departure day

🛫 Routes3 · economy + business

🗓 Searched8 Jul 2026

🏆 What the test showed

It depends entirely on the route. On a short leisure hop (New York → Las Vegas, economy) the same nonstop swung from $217 to $273 across one week, and the cheap days repeated all month. In business class (London → New York) it swung from £3,280 to £5,005, a £1,725 gap for the same seat. But on a long-haul with one daily nonstop (Amsterdam → Bangkok) the day barely registered, KLM held €761 almost every day. Flexibility is worth real money where a route is competitive or in demand, and next to nothing where it isn't. Either way, the date grid tells you which you're on in about ten seconds.

Route 1 · economy · a short leisure hop

🇺🇸 New York → Las Vegas 🇺🇸

The same 4-night nonstop trip, priced in US dollars, departing each day of one week (14-20 Sep 2026). One price per day, cheapest nonstop round trip.

Departure day	Cheapest nonstop	vs the cheapest day
Mon Mon 14 Sep	$238 Delta · JFK-LAS	+$21
Tue Tue 15 Sep	$217 Delta · JFK-LAS	✓ Cheapest day
Wed Wed 16 Sep	$273 Delta · JFK-LAS	✕ +$56 · most expensive
Thu Thu 17 Sep	$217 Delta · JFK-LAS	✓ Cheapest day
Fri Fri 18 Sep	$238 Delta · JFK-LAS	+$21
Sat Sat 19 Sep	$217 Delta · JFK-LAS	✓ Cheapest day
Sun Sun 20 Sep	$252 Delta · JFK-LAS	+$35

The pattern was real, not a fluke: Tuesday, Thursday and Saturday hit the same $217 floor, and that same price kept showing up on almost every Tuesday and Saturday across the month. Delta's nonstops out of JFK set the cheapest fare every day, so the price moved with the calendar, not the airline. (New York here means all three airports, JFK, LaGuardia and Newark; the cheapest fares all flew from JFK.) Look beyond one week and the gap grows, the same trip was up in the $400s in peak early August.

Every figure is the cheapest nonstop round trip for a 4-night stay departing that date, in USD from the US site, on 8 Jul 2026. One snapshot; fares move, so read the shape, not the cents.

Route 2 · economy · a long-haul

🇳🇱 Amsterdam → Bangkok 🇹🇭

Same test, opposite kind of route: the same 14-night nonstop trip, priced in euros, departing each day of one week (11-17 Sep 2026).

Departure day	Cheapest nonstop	vs the cheapest day
Fri Fri 11 Sep	€761 KLM · nonstop	✓ Cheapest day
Sat Sat 12 Sep	€818 KLM · nonstop	✕ +€57 · most expensive
Sun Sun 13 Sep	€761 KLM · nonstop	✓ Cheapest day
Mon Mon 14 Sep	€761 KLM · nonstop	✓ Cheapest day
Tue Tue 15 Sep	€761 KLM · nonstop	✓ Cheapest day
Wed Wed 16 Sep	€761 KLM · nonstop	✓ Cheapest day
Thu Thu 17 Sep	€761 KLM · nonstop	✓ Cheapest day

Six days out of seven cost exactly the same: €761. Thai Airways also flies the route nonstop, but at a higher fare (€818 that day), so KLM set the floor every day. The only mover was the Saturday, and the date grid made clear that's a Saturday-return premium, not the day you set off. Widen to whole months and it stays flat: the nonstop held in a €760-830 band through to November.

Every figure is the cheapest nonstop round trip for a 14-night stay departing that date, in EUR from the Netherlands site, on 8 Jul 2026. Same snapshot caveat applies.

Route 3 · business · a premium long-haul

🇬🇧 London → New York 🇺🇸

The same test in business class: the same 5-night nonstop trip, priced in pounds, departing each day of one week (11-17 Sep 2026).

Departure day	Cheapest nonstop business	vs the cheapest day
Fri Fri 11 Sep	£3,355 JetBlue Mint · LHR-JFK	+£75
Sat Sat 12 Sep	£3,755 JetBlue Mint · LHR-JFK	+£475
Sun Sun 13 Sep	£5,005 JetBlue Mint · LHR-JFK	✕ +£1,725 · most expensive
Mon Mon 14 Sep	£4,405 JetBlue Mint · LHR-JFK	+£1,125
Tue Tue 15 Sep	£3,905 JetBlue Mint · LHR-JFK	+£625
Wed Wed 16 Sep	£3,280 JetBlue Mint · LHR-JFK	✓ Cheapest day
Thu Thu 17 Sep	£3,830 JetBlue Mint · LHR-JFK	+£550

Same idea, far bigger numbers. The same business seat swung £1,725 across the week, cheapest on Wednesday, worst on Sunday. JetBlue's Mint cabin (Heathrow to JFK) set the floor every day, well under British Airways, Virgin and United, whose nonstop business ran £6,700 and up. Worth knowing: a one-stop business fare came in around £2,250, under any nonstop here, but that's about taking a connection, not moving your dates.

Every figure is the cheapest nonstop business round trip for a 5-night stay departing that date, in GBP from the UK site, on 8 Jul 2026. Same snapshot caveat applies.

On the short hop, the day you leave was worth about a quarter of the fare.

Same nonstop New York to Las Vegas trip, just started on a different day: $217 leaving Tuesday, Thursday or Saturday, $273 on Wednesday. That's $56, about a quarter of the fare, for identical flights. And it wasn't a one-day fluke, that same $217 kept showing up on almost every Tuesday and Saturday across the month. On a busy, competitive leisure route, the calendar is one of the biggest levers on the final price.

In business class, the swing was worth over £1,700.

London to New York in business, nonstop, moved from £3,280 to £5,005 across one week, a £1,725 gap for the same seat up front. The percentage is similar to the Vegas hop, but the money is on another scale: in premium cabins, shifting your dates a few days is worth more than most people's entire economy ticket. (A one-stop business fare, for what it's worth, was around £2,250, far under any nonstop, but that's a story about connections, not dates.)

And on the long-haul, the day barely mattered at all.

Amsterdam to Bangkok was the exception: KLM's nonstop held at €761 every day, the only bump a Saturday return at €818, and it stayed flat across weeks too. One airline flying it once a day at a steady price leaves no cheap day to chase. So the honest version of "be flexible" isn't "move your dates and always save." It's "the more competitive or in-demand the route, the more the day matters," and the date grid tells you which one you're on in about ten seconds.

How we'd actually use this

1
Search your trip normally, then set the stops filter to Nonstop and open the date grid or price graph. Google shows one price per day, so the cheap days jump out.
2
If the prices bounce around by the day, you're on a route where the day of the week matters, aim for the cheap days and check nearby airports on both ends too.
3
If they're flat (a long-haul on one daily nonstop), stop hunting for a magic day. Compare different weeks or months instead, that's where the money is.

How we tested. One trip per route, its length held fixed, priced on the afternoon of 8 Jul 2026 on Google Flights with the nonstop filter on: New York → Las Vegas as a 4-night economy round trip in USD; Amsterdam → Bangkok as a 14-night economy round trip in EUR; London → New York as a 5-night business round trip in GBP, each from its own country's point of sale. For each route we read the cheapest nonstop departing every day of one week off the date grid, then checked the wider trend on the price graph. Prices change constantly, so don't fixate on the exact numbers, the point is the overall pattern.

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