Here's a more detailed breakdown:

Domestic Flights:

Tuesdays and Wednesdays are often cheaper due to lower demand, especially during peak travel seasons. Flights on Saturdays can also be cheaper than Sundays. 

International Flights:

Wednesdays and Saturdays are often the cheapest days, again due to lower demand. 

Weekends and Holidays:

Fridays, Saturdays, and Sundays, and flights on holidays, are generally the most expensive due to higher demand. 

Other Factors:

While the above provides general trends, factors like the time of year, specific routes, and airline policies can influence pricing.