Probably everyone on here knows this and checks it everytime. I didn't so I reckon I'll share.
I was boking a couple of flights from Bangkok to Singapore and checked out Adioso. Airasia was about $20 cheaper than Jetstar on Adioso. Skyscanner showed Jetstar as being about $25 cheaper than airasia. I clicked through to the listed provider - expedia.com.au. I tried to book but it kept telling me the price had changed and I'd have to click that I accepted the new price. The price did change a couple of times and always to the more expensive side. It was going to be about $30 more overall. I liked the departure time on jetstar better so was willing to pay a little less than I would have with my preferred carrier - airasia. I just couldn't get it to go through however.
So I went to starthere and clicked through to expedia. I ended up being able to buy the Jetstar tix on the expedia website at the original lowest cost. Even though expedia slugged me with a $16 cc fee, I am still about $50 - 60 ahead with a preferred time. Thanks to the fact that I am staying at the Bangkok King Power Pullman on the club level, I am able to access the King Power lounge at BKK. I think it will be crap, but probably better than hanging around the regular departure hall.
So my lower price on Jetstar was accessed via expedia independent of skyscanner. I was able to access that price through starthere and presumably from just entering the url.
I hope adioso can come up with a way to show these lower fares available on expedia.
That $50 or so savings is on a total paid of $239, so a great percentage savings.
One downside is I do not think I would have been able to pay for checked luggage on the expedia site. I didn't see it. If you need checked luggage, jetstar will charge you more if you add it on later.
Be very careful with Expedia. I used them for a motel booking for 3 people, Adults, one child. Said on booking for 3 and it was supposed to be a family room according to their site, but confirmation email was for 2 with additional price for the child of $15 making it more expensive than Wotif. So I cancelled- what a load of trouble. In the end, I contacted the motel directly to make sure it was cancelled and they told me that Expedia had only booked a twin room with an additional person. So I hope you get what you've paid for. I did see a recent episode of the airways show where someone had trouble with their booking through a third party and the Airline said, "Not our fault. You'll have to take it up with them."