One datapoint me: I never see any difference in flight prices, but I haven't tried VPN-ing into the site from another country. For hotels, prices I find through aggregators can be as much as 50% lower than the hotel's own website price, even when their website claims it's showing me the lowest price.

Then you my friend have been overpaying for flights and hotels. Next time you want a holiday, try the classic techniques - Incognito windows, multiple sites, and then compare it with your Google Flights searching

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This is an easily debunked myth, for first-party direct bookings. Third party aggregators and package deals are shady as hell and do all kinds of tricks. But I challenge you to record a screen cast proving that you're seeing different prices for a direct booking for the same ticket (including fare class) just based on different browsers or profiles.

This used to be fairly widespread a long time ago. There used to be fares that are restricted for sale only in a certain country's POS (I believe these are still alive in ATPCO) but not really used anymore.

I remember examples of round-trip ticket A-B-A costing $x in A, $x/2 in B (plus another fare for country C) for some city pairs, but I don't think this has really been a thing in a decade at least.

Are you only just finding out about dynamic pricing? It's still in full swing everywhere. If you want to witness it, the Chinese websites Temu & AliExpress experiment with this on nearly every item. Flights are exactly the same, and because you haven't experienced it shows you haven't caught it

For changing browsers, IPs, user agents, etc., it probably rounds to 0%. There are some edge cases booking flights directly from national carriers from within/outside the country. For using third party OTAs for hotels, I'd guess maybe 5% or so on average depending on your usage, but the financial tradeoff isn't directly comparable. You can probably save a bit by booking third party, especially if you haven't bothered signing up for hotel loyalty programs [1]. There are...let's say "discontinuous" long tail issues with booking hotels third party, where probably 95-99% of the time you'll have no problems, but when there is one, you'll have a much better chance of having a very bad time. The price gap on flights is probably considerably smaller (commissions on flights are much lower than commissions on hotels), but if you have any sort of problem (e.g. a flight being delayed when you have a layover), you have a much better chance of getting screwed.

Personally I mostly use Google Flights for flight search (or seats.aero for award travel search) and booking.com for hotel search, and then book directly. I've booked probably 100+ hotels through booking.com and then quit entirely after hitting that long tail bad experience.

[1]: I'm a few years out of date on this and don't know the current legalities, but major OTAs (Booking.com and Expedia, who control probably 80-90% of third party hotel bookings) used to have a "most favored nation" clause that prevented hotels from advertising lower prices through other channels without a previous commercial relationship. Signing up for a loyalty program qualifies, so being logged in for direct hotel bookings can sometimes get you cheaper room rates. (In the US, things like AARP and AAA memberships also work.) I know the EU was pushing back on these clauses but I'm not clear on what the current state of things is.

There are a few more modern OTAs that rebate a portion of the OTA commission back to you (see Rove, often rebating 15+%) and more that rebate a flat rate (Chase at 8%, Amex at 5%, Cap1 at 10%, etc). The "member pricing" is often 1-2% lower at most, so going through an OTA should get you around 10% off rack rate at minimum, more if commissions are particularly high (hotels pay about 20-30+%, so it's not uncommon to see 20% returns on Rove. Highest I've seen is 50%!).

OTAs can play "member" pricing games too I think so there's even better deals to be had.

So you definitely need to comparison shop, I make my agent take the pricing from all the OTAs and calculate a post-rebate price, then pick the lowest one.

> There are a few more modern OTAs that rebate a portion of the OTA commission back to you (see Rove, often rebating 15+%) and more that rebate a flat rate (Chase at 8%, Amex at 5%, Cap1 at 10%, etc).

Amex/Chase/Cap1 portals are still not worth it.

Even after the 5-10% cash back on hotels booked on their portal, you are still overpaying by 1-3% of the “book direct with hotel” rate.

Then once you take into account a 2-3% straight cash back card, the credit card travel portals tend to overcharge you by 5-8%. This is after taking into account all the points game nonsense. Do the math yourself.

> $100 book direct Hilton/marriott/IHG rate

This hasn't been my experience. I usually search through Booking.com and when I contacted the hotel directly, found that the direct rate is higher than the booking.com rate.

Anywhere from 45% to 5% IMO. So you can almost always save $5, but sometimes you can save like $50+.

Just by signalling interest by lingering and searching for the same flight multiple times a day I have bumped the price for the ticket that I was interested in.

Just a thought but I guess if the airline web services were overwhelmed with noise, they wouldn't be able to do such price adjustments reliably. The only risk is that this might bump the prices for everyone and it will turn out that consumers are not price sensitive enough to force airlines to not do this.

The most I've seen is about 25%, around £500. The difference was due to deal only offered on a one way ticket when bought through the site of a code-sharing airline.