Flying throughout the U.S. brings travelers closer to national monuments like the Golden Gate Bridge of San Francisco, the Gateway Arch in St. Louis, and the Sears Tower in Chicago. Add to this the mind-blowing landscapes, found in the magnificent National Parks like Yosemite, Yellowstone and Death Valley, as well as spectacular sights like the Grand Canyon and the Rocky Mountains, and visitors will begin to discover something of what makes U.S.A. flights so unique. 
While many theories exist around booking specifically on a Tuesday to save money, the reality is there is no consistent truth to exactly which days are cheapest to fly. Most of the time it is cheaper to leave on a weekday, though this isn't always the case. Your best strategy is to get a quick visual of prices for a whole month to see what days are cheapest for your specific route. Here's how:
Again this varies a lot depending on where you are going, Los Angeles is cheapest around January due to it being the rainy season so you’ll find the cheapest flights to the USA then, Miami experience its off season from June to August as temperatures get very hot so cheap flight tickets are more readily available if you plan in advance and book them early.
You can even book your own multi-day layovers, essentially allowing you to see 2 destinations for the price of 1. Rather than spend a day sitting in the airport, you can spend multiple days exploring the city you are laying over in. AirWander is a specialized search engine for doing exactly this. Put in your origin, final destination, and number of days you want to stopover. AirWander will return a list of places you can visit on your stopover, often even cheaper than a regular flight search engine! To learn how to do this, read our guide on How to Get Free Extended Layovers & Hack One Trip Into Two.
Compare between different airlines (regular and budget) and between the different classes of seats offered! If you can enjoy business class on a budget airline for the same money you'd pay to fly economy on a more "prestigious" airline, more power to you. You end up in the same destination but get to enjoy a more comfortable, luxurious experience. Why not?
The “land of opportunity” is also a land of great diversity made up of many cultures and incredible scenery. International travelers booking flights to the United States are welcomed throughout the 50 states and domestic travelers find plenty of opportunity to hop US flights and take in the vast regions that grace the country. Scattered U.S. territories, including Puerto Rico, Guam, American Samoa, the Midway Islands and U.S. Virgin Islands, are popular destinations for US travelers seeking cheap USA flights to seemingly far-away destinations.
Typically, I start all my searches with Momondo because it searches all major AND budget airlines, non-English websites, English websites, and everything in between. I’ve been using them since 2008 and they vet all the sites they link to as they have strict criteria on who the operate with. Momondo is one of the most comprehensive booking sites out there, they have the lowest price 99% of the time, and it’s the search engine all the other travel experts I know use too.
usually don’t charge you any type of fee so it never hurts
planning if you want everything to go smoothly.

even be able to find a nice hotel/airfare package deal.
Decorating the American skies with distinct designs, the jets of Frontier Airlines, with their golden eagles, foxes and Rocky Mountain bears offer travelers oodles of short-haul connections between the cities of the central United States. Passengers with the budget carrier enjoy fares starting at just $30 round trip, not to mention reduced baggage fees to the tune of $15 and an EarlyReturns mileage program, offering rewards like hotel stays, car rental and priority boarding to name just a few.
Look into alternative routes. Slightly different than flying indirectly with layovers, if you aren’t in a time crunch consider taking alternative routes to your destination. If you can get a cheaper flight flying from Seattle to Boston, and then from Boston to London, then book two separate flights. Breaking up your travel will lengthen the amount of time you have to spend journeying to your destination, but it could be one of the best ways to manage saving money.[6]
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If you are going to fly when everyone is flying, then you’re ticket is going to cost more. Try to be flexible with your dates. If you are dead-set on visiting Paris, go to Paris in the spring or fall when fewer people visit and airfares are cheaper. But if you want to go in the middle of August? You’re out of luck. Hawaii over Christmas? Good luck!
While the above search engines are great, they do not always include small airlines, especially in less popularly booked routes and/or in remote regions. If you're flying somewhere obscure, Google search and ask around if there exists a local airline. While in South America we learnt that the LADE Air in Argentina (run by the military) has cheap flights to Patagonia, which is of course not listed in mass search engines online.
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