Southwest is currently having a great sale on flights as they do each year for the fall time frame. Airfare is good from August 20th to December 18th. Airfare is as cheap as $49 one way! You have to book before Thursday, June 6th. https://www.southwest.com/html/offers/nationwide_sale_NonstopConnect_190604.html?clk=3313063

There is a Southwest Airlines sale going on at the moment until February 28th that includes multiple destinations. It is good on flights from March 19th to May 22 for Domestic and April 23rd to May 16th for International. The lowest fare is $59 to Corpus Christi, TX. https://www.southwest.com/html/promotions/nationwide_sale_nonstop_190225_offers.html?clk=2710062&originMarket=HOU&originAirport=HOU

Southwest is running a sale where out of Houston you can get fares as low as $93 one way (a moderate sale). You have to book by 1/31 and fly between 2/19 and 5/22. Check it out if you are looking to travel. https://www.southwest.com/html/promotions/nationwide_sale_190108_offers.html?clk=2635065&originMarket=HOU&originAirport=HOU

It looks like Frontier is running another sale. You have to book by November 30th. There are deals for $20-$34 to Denver out of Houston depending on the day of the week you go on. Pretty good deal to a great city to visit!   https://www.flyfrontier.com/deals/flight-sales/

There is a very good SouthWest Airlines sale going on at this moment. You must purchase by October 4th for travel during the following dates: 11/28/18 – 12/19/18 and 1/3/19 – 2/13/19. It is not valid for airfare on Fridays and Sundays. You can get airfare as low as $49 one way. Check it out if you want to take a winter trip. https://www.southwest.com/html/promotions/nationwide_sale_181002_offers.html?clk=2153092

Wow Airlines from Iceland is offering some great deals to for the fall. They are offering airfare to cities like London and Brussels for $99 one way and $69 one way to Reykjavik (September, October and November). One thing to note that Wow Airlines is a low cost carrier so there will be extra fees for bags and seat reservations but the low starting price is a steal. Check it out if you want to travel to Europe. https://wowair.us/offer/special-offer/?selected_airport=DFW

There is a sale going until September 5th for flight from October 31st to March 31st 2019. Norwegian is a low cost carrier so there will be extra fees for bags and seat assignments. They do not fly into Houston but you could fly them from another airport. There are fares to Europe as low as $169 one way. Check it out!   https://www.norwegian.com/us/flights/to-europe?utm_source=NL_Oracle_Responsys_US&utm_medium=email&utm_content=ORG&utm_campaign=2018_W35_USA_FALL-SALE_US

Emirates is having a Labor Day Sale on Fares from September 5th to December 6th. You can go round trip to places like Mumbai or Delhi India for $819 round trip from Houston. Check it out if you want to travel internationally this fall. https://www.emirates.com/us/english/book/featured-fares/?cid=PHG-tradetracker&utm_source=tradetracker&utm_medium=affiliate&utm_campaign=0&utm_content=digidip+GB&refurl=

Frontier Airlines is running a deal that gives a good discount. If you buy by October 29th and its good Monday-Thursday and Saturday for September 5th to October 4th. I checked for Denver for example and you can fly as low as $25 one way. This of course does not include bags or seat selection costs. Check it out, it looks to be a good deal. https://www.flyfrontier.com/ways-to-save/sales/promo-codes/save90

If you are going to be in Europe in September Aer Lingus of Ireland is offering 20% off some of their sunnier locations they fly to. https://www.aerlingus.com/plan-and-book/latest-offers/flights-from-ireland/september-sun/