Do you have a trip in mind? So if you see a wildly inexpensive fare on one of the deal sites, book it ASAP—they usually only last a few hours, max—and hold off on reserving any additional activities or accommodation until you have a ticket number or booking reference from the airline.

When you’re shopping for airline flights, a nonstop flight is always preferable to one that gets you to your destination via an out-of-the-way pit stop that adds hours to your trip and also uncertainty by raising the odds of delays or missed connections.

Scott Keyes, founder and CEO of the flight deals site Scott’s Cheap Flights, said travelers should book between one to three months ahead for domestic flights at off-peak times and two to eight months for international flights to have the best chance at low prices.

If you deviate by traveling from a different city, wish to travel in an upgraded class of service, or wish to travel outside the program start and end dates, then we will apply a credit towards the total cost of the airfare and you will pay only the additional costs.

These Terms & Conditions cover Deposit & Final Payment information, Air-Inclusive Deposits & Final Payment, Revisions & Revision Fees, Air Arrangements, Participation, Travellers Who Need Special Assistance, Young Travellers, Smoking, Price Policy, Visas and Passports, Hotels & Accommodations, Baggage Allowance, Travel Documents, Not Included in the Land Price, Refunds, Service Inquires After the Vacation, Holidays, Safety, Photos & Pictures, Optional Excursions, and Responsibility.