Ultra Low Cost Airlines:
While the fares may be the cheapest with an Ultra Low Cost Airline, the schedule may not match your desired travel dates and/or times. Most Ultra Low Cost Airlines offer a flight only once per day and in some cases only once or twice per week. Make sure to keep a contingency plan in case your flight ends up extremely delayed or canceled.
Legacy carriers offer the best schedules and can usually accommodate your travel needs for any day or time. Keep in mind that based on volume and demand, traveling at certain days and times can cost more.