Be a little flexible with your flight itinerary and you could save some cash; that's because some days are cheaper for flying than others. There are two specific days that are cheapest for air passengers. Those days are likely to yield the best rates for departures and arrivals. But remember: This isn't an exact science.
The universal consensus seems to be that airfares tend to be lowest for flights that depart on Tuesdays and Wednesdays. That's what George Hobica of Airfarewatchdog says, along with CheapAir. Some sources, including Fodor's, add Thursday, and others, including Smarter Travel's Josh Roberts and FareCompare, add Saturday.
Expedia's 2015 Travel Trends White Paper posts the most comprehensive analysis of the "when to fly" question. Expedia concludes that, for long-haul flights, leaving on Thursday and returning on Monday costs around 20 percent less than leaving on Friday and returning on Saturday. The lowest in-and-out combinations tend to include outbound flights on Sunday, Tuesday, Wednesday, or Thursday with return flights on Sunday, Monday, Wednesday, or Thursday. For short-haul trips, Expedia's lowest-fare groupings are Monday, Tuesday, and Wednesday both ways.
Related: When Should I Buy My Flight?
Does time of day matter? Oddly enough, you find very little data on this question. Overall, afternoons are the "rush hour" for flying, so you find fewer good airfares on afternoon flights. On some short-haul routes, early mornings are also rush hour, as business travelers start their quick in-and-out single-day trips. Still, others say the dinner hour is a good time to fly.
On domestic routes, fares for overnight red-eye flights are often lower than for daytime flights—but you have to put up with the miseries of sitting up all night in a tiny economy seat.
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