Update: Some offers mentioned below are no longer available. View the current offers here.Want to see the latest flight deals as soon as they’re published? Follow The Points Guy on Facebook and Twitter, and subscribe to text message alerts from our deals feed, @tpg_alerts.Airfare deals are typically only available on limited dates. We recommend you use Google Flights to find dates to fly, then book through an online travel agency such as Orbitz or Expedia, which allows you to cancel flights without penalty by 11 p.m. Eastern Time within one day of booking. However, if you’re using The Platinum Card® from American Express, you’ll need to book directly with the airline or through the Amex Travel portal to get 5x MR points. Remember: Fares may disappear quickly, so book right away and take advantage of Orbitz or Expedia’s courtesy cancellation if you’re unable to get the time away from work or family.If you haven’t planned your fall travels yet, it might be time to book a trip to historic Mexico City. Flights have dropped as low as $215 round-trip and some deals start as soon as September and last well into March 2020.All of these low fares are in each carrier’s basic economy, so you’ll have to pay additional fees to check a bag and select seats ahead of time, and may not be eligible for upgrades.As mentioned, many of these low fares are available as soon as September, but you’ll have to play around with the dates and routes on Google Flights to see what fits your travel plans.To search, head to Google Flights and enter your origin and destination cities. Scroll through the calendar function to find dates and prices that work for you. Finally, click through to book directly with the airline or through an OTA like Priceline or Expedia.Airline: American, Delta, Aeromexico, JetBlue, Volaris, Viva AerobusRoutes: DFW/CLT/RIC/FLL/MSY/MCO/RDU/ORD/CLE/LAX/JFK/STL/MCI/ATL/BOS/CHA/JAX/PHL/DEN/LAS/SEA to MEXCost: $215+ round-trip in basic economy Travel Dates: September 2019-March 2020Pay With: The Platinum Card® from American Express (5x on airfare booked directly with the airline), Citi Prestige Card (5x on airfare), Citi Premier® Card, Chase Sapphire Reserve, American Express® Gold Card (3x on airfare when booked directly with the airline) or Chase Sapphire Preferred Card (2x on travel)Here are a few examples of what you can book:Sign up for our daily newsletterEmail addressSign upI would like to subscribe to The Points Guy newsletters and special email promotions. The Points Guy will not share or sell your email. See privacy policy.Ft. Lauderdale (FLL) to Mexico City (MEX) for $215 round-trip on JetBlue:Orlando (MCO) to Mexico City (MEX) for $225 round-trip on JetBlue:Dallas (DFW) to Mexico City (MEX) for $233 round-trip on Aeromexico:New York (JFK) to Mexico City (MEX) for $240 round-trip on Viva Aerobus:Las Vegas (LAS) to Mexico City (MEX) for $273 round-trip on Volaris:Jacksonville (JAX) to Mexico City (MEX) for $278 round-trip on JetBlue:Los Angeles (LAX) to Mexico City (MEX) for $279 round-trip on Aeromexico:Chicago (ORD) to Mexico City (MEX) for $290 round-trip when booked separately on JetBlue and Volaris:New York (JFK) to Mexico City (MEX) for $289 round-trip on JetBlue:Boston (BOS) to Mexico City (MEX) for $290 round-trip on Delta:Denver (DEN) to Mexico City (MEX) for $298 round-trip on Volaris:Atlanta (ATL) to Mexico City (MEX) for $321 round-trip on JetBlue:Charlotte (CLT) to Mexico City (MEX) for $334 round-trip on Volaris:Philadelphia (PHL) to Mexico City (MEX) for $335 round-trip on American:Seattle (SEA) to Mexico City (MEX) for $335 round-trip on Volaris:Cleveland (CLE) to Mexico City (MEX) for $338 round-trip on JetBlue:Raleigh (RDU) to Mexico City (MEX) for $352 round-trip on Delta:Kansas City (MCI) to Mexico City (MEX) for $365 round-trip on American:Richmond (RIC) to Mexico City (MEX) for $369 round-trip on American:St. Louis (STL) to Mexico City (MEX) for $369 round-trip on American:Charleston (CHS) to Mexico City (MEX) for $369 round-trip on American:Maximize Your PurchaseDon’t forget to use a credit card that earns additional points on airfare purchases, such as The Platinum Card® from American Express (5x on flights booked directly with airlines or American Express Travel), Citi Prestige Card (5x on airfare), Chase Sapphire Reserve, American Express® Gold Card, Citi Premier® Card (3x on airfare) or the Chase Sapphire Preferred Card (2x on all travel purchases). Check out this post for more on maximizing airfare purchases.