Perhaps.

If you visit the airline's site multiple times, you are not penalized (price-wise) for that.

However, given well-known yield management techniques, you are likely to see the price rise over time.

Variations such as the modulation on the time of day make generalizable comparisons harder.

If you browse the site in a fresh browser, you may see a different offer but the resulting price is substantially similar. This kind of makes sense as a marketing ploy — try harder to attract the comparison shopper, but sell them the same ticket in the end.

http://skeptics.stackexchange.com/questions/9597/do-ryanair-...