Southwest Airlines is having a massive 72-hour sale with round-trip fares below $100

If you haven't planned a summer vacation yet, you may be in luck. Southwest Airlines' massive bi-annual fare sale is back -- and get this, some round-trip flights are below $100.

According to CNBC, "Flights begin at $49 each way on Southwest's shortest routes and increase to $79, $99 or $129 each way for longer flights." The reduced prices are valid on domestic travel between August 22 through December 13, 2017 (okay, so it'd be more like an end-of-summer or fall vacay) and only apply to nonstop flights.

RELATED: TripAdvisor names the top hotels in the world

53 PHOTOS
TripAdvisor names the top 25 hotels in the world - 2017
See Gallery
TripAdvisor names the top 25 hotels in the world - 2017

23. The Alpina GstaadGstaad, Switzerland

Photo: TripAdvisor

23. The Alpina GstaadGstaad, Switzerland

Photo: TripAdvisor

22. Hotel Estalagem St HubertusGramado, Brazil

Photo: TripAdvisor

22. Hotel Estalagem St HubertusGramado, Brazil

Photo: TripAdvisor

21. Umaid Bhawan Palace JodhpurJodhpur, India

Photo: TripAdvisor

21. Umaid Bhawan Palace JodhpurJodhpur, India

Photo: TripAdvisor

20. Hotel 41London, United Kingdom

Photo: TripAdvisor

20. Hotel 41London, United Kingdom

Photo: TripAdvisor

19. The Leela Palace UdaipurUdaipur, India

Photo: TripAdvisor

19. The Leela Palace UdaipurUdaipur, India

Photo: TripAdvisor

18. Lindos BluLindos, Greece

Photo: TripAdvisor

18. Lindos BluLindos, Greece

Photo: TripAdvisor

15. Belmond Palacio NazarenasCusco, Peru

Photo: TripAdvisor

15. Belmond Palacio NazarenasCusco, Peru

Photo: TripAdvisor

12. Hotel Eclat BeijingBeijing, China

Photo: TripAdvisor

12. Hotel Eclat BeijingBeijing, China

Photo: TripAdvisor

11. Kandolhu Maldives North Ari Atoll, Maldives

Photo: TripAdvisor

11. Kandolhu Maldives North Ari Atoll, Maldives

Photo: TripAdvisor

10.  JA Manafaru – Haa Alif Atoll, Maldives

  • Bookable on TripAdvisor for an average rate of $811 per night. Most affordable month to visit: June ($677 per night). Lowest weekly rate during peak season: $844 during February 29 – March 6.

 Photo: TripAdvisor

10.  JA Manafaru – Haa Alif Atoll, Maldives

  • Bookable on TripAdvisor for an average rate of $811 per night. Most affordable month to visit: June ($677 per night). Lowest weekly rate during peak season: $844 during February 29 – March 6.

Photo: TripAdvisor 

9.      Tulemar Bungalows & Villas – Province of Puntarenas, Costa Rica

  • Bookable on TripAdvisor for an average rate of $323 per night. Most affordable month to visit: October ($198 per night). Lowest weekly rate during peak season: $423 during December 12 – 18.

Photo: TripAdvisor 

9.      Tulemar Bungalows & Villas – Province of Puntarenas, Costa Rica

  • Bookable on TripAdvisor for an average rate of $323 per night. Most affordable month to visit: October ($198 per night). Lowest weekly rate during peak season: $423 during December 12 – 18.

Photo: TripAdvisor 

8.      Hanoi La Siesta Hotel & Spa – Hanoi, Vietnam

  • Bookable on TripAdvisor for an average rate of $102 per night. Most affordable month to visit: June ($91 per night). Lowest weekly rate during peak season: $111 during March 21 – 27.

Photo: TripAdvisor 

8.      Hanoi La Siesta Hotel & Spa – Hanoi, Vietnam

  • Bookable on TripAdvisor for an average rate of $102 per night. Most affordable month to visit: June ($91 per night). Lowest weekly rate during peak season: $111 during March 21 – 27.

Photo: TripAdvisor 

7.      Shinta Mani Resort – Siem Reap Province, Cambodia

  • Bookable on TripAdvisor for an average rate of $151 per night. Most affordable month to visit: June ($132 per night). Lowest weekly rate during peak season: $162 during September 19 – 25.

Photo: TripAdvisor 

7.      Shinta Mani Resort – Siem Reap Province, Cambodia

  • Bookable on TripAdvisor for an average rate of $151 per night. Most affordable month to visit: June ($132 per night). Lowest weekly rate during peak season: $162 during September 19 – 25.

Photo: TripAdvisor 

6.      Portrait Firenze – Florence, Italy

  • Bookable on TripAdvisor for an average rate of $676 per night. Most affordable month to visit: February ($410 per night). Lowest weekly rate during peak season: $718 during October 24 – 30.

Photo: TripAdvisor 

6.      Portrait Firenze – Florence, Italy

  • Bookable on TripAdvisor for an average rate of $676 per night. Most affordable month to visit: February ($410 per night). Lowest weekly rate during peak season: $718 during October 24 – 30.

Photo: TripAdvisor 

5.      BoHo Prague Hotel – Prague, Czech Republic

  • Bookable on TripAdvisor for an average rate of $209 per night. Most affordable month to visit: February ($139 per night). Lowest weekly rate during peak season: $219 during June 6 – June 12.

Photo: TripAdvisor 

5.      BoHo Prague Hotel – Prague, Czech Republic

  • Bookable on TripAdvisor for an average rate of $209 per night. Most affordable month to visit: February ($139 per night). Lowest weekly rate during peak season: $219 during June 6 – June 12.

Photo: TripAdvisor 

4.      Hotel The Serras – Barcelona, Spain

  • Bookable on TripAdvisor for an average rate of $420 per night. Most affordable month to visit: January ($247 per night). Lowest weekly rate during peak season: $444 during May 9 – 15.

Photo: TripAdvisor 

4.      Hotel The Serras – Barcelona, Spain

  • Bookable on TripAdvisor for an average rate of $420 per night. Most affordable month to visit: January ($247 per night). Lowest weekly rate during peak season: $444 during May 9 – 15.

Photo: TripAdvisor 

3.      Turin Palace Hotel – Turin, Italy

  • Bookable on TripAdvisor for an average rate of $180 per night. Most affordable month to visit: August ($149 per night). Lowest weekly rate during peak season: $189 during October 17 – 23.

Photo: TripAdvisor 

3.      Turin Palace Hotel – Turin, Italy

  • Bookable on TripAdvisor for an average rate of $180 per night. Most affordable month to visit: August ($149 per night). Lowest weekly rate during peak season: $189 during October 17 – 23.

Photo: TripAdvisor 

2.      Mandapa, A Ritz-Carlton Reserve – Ubud, Indonesia

  • Bookable on TripAdvisor for an average rate of $502 per night. Most affordable month to visit: May ($449 per night). Lowest weekly rate during peak season: $478 during June 20 – 27.

Photo: TripAdvisor 

2.      Mandapa, A Ritz-Carlton Reserve – Ubud, Indonesia

  • Bookable on TripAdvisor for an average rate of $502 per night. Most affordable month to visit: May ($449 per night). Lowest weekly rate during peak season: $478 during June 20 – 27.

Photo: TripAdvisor 

1.      Aria Hotel Budapest by Library Hotel Collection – Budapest, Hungary

  • Bookable on TripAdvisor for an average rate of $288 per night. Most affordable month to visit: March ($252 per night). Lowest weekly rate during peak season: $307 during September 5 – 11.

Photo: TripAdvisor 

1.      Aria Hotel Budapest by Library Hotel Collection – Budapest, Hungary

  • Bookable on TripAdvisor for an average rate of $288 per night. Most affordable month to visit: March ($252 per night). Lowest weekly rate during peak season: $307 during September 5 – 11.

Photo: TripAdvisor 

1.      Aria Hotel Budapest by Library Hotel Collection – Budapest, Hungary

  • Bookable on TripAdvisor for an average rate of $288 per night. Most affordable month to visit: March ($252 per night). Lowest weekly rate during peak season: $307 during September 5 – 11.

Photo: TripAdvisor 

1.      Aria Hotel Budapest by Library Hotel Collection – Budapest, Hungary

  • Bookable on TripAdvisor for an average rate of $288 per night. Most affordable month to visit: March ($252 per night). Lowest weekly rate during peak season: $307 during September 5 – 11.

Photo: TripAdvisor 

HIDE CAPTION
SHOW CAPTION
of
SEE ALL
BACK TO SLIDE

The major announcement, however, is seemingly not without its fair share of catches. "Those used to Southwest's previous sale fares should be warned that the availability of Southwest's cheapest fares appears to be somewhat more limited than in past sales," USA Today claims. You don't know until you try though, right?

The sale ends on Thursday, June 8 at 11:59 p.m. in the respective time zone of the originating city. For all exclusions and exceptions, see the full details here.

RELATED: A ranking of America's top 10 airlines

13 PHOTOS
A ranking of America's top airlines
See Gallery
A ranking of America's top airlines

No. 12: Frontier Airlines

Photo credit: Reuters 

No. 11: Spirit Airlines 

Photo credit: Reuters 

No. 10: ExpressJet 

Photo credit: Getty

No. 9: American Airlines 

Photo credit: Reuters 

No. 8: United Airlines 

Photo credit: Getty

No. 7: SkyWest Airlines 

Photo credit: Getty 

No. 6: Southwest Airlines 

Photo credit: Reuters 

No. 5: Hawaiian Airlines 

Photo credit: Getty

No. 4: JetBlue 

Photo credit: Reuters 

No. 3: Virgin America

Photo credit: Reuters 

No. 2: Delta Air Lines 

Photo credit: Reuters 

No. 1: Alaska Airlines 

Photo credit: Getty

HIDE CAPTION
SHOW CAPTION
of
SEE ALL
BACK TO SLIDE

Read Full Story

Sign up for the Travel Report by AOL newsletter to get exclusive deals and wanderlust inspiration delivered straight to your inbox every day.

Subscribe to our other newsletters

Emails may offer personalized content or ads. Learn more. You may unsubscribe any time.