General note: These deals existed at the time of publishing, on Monday, Sept. 19. They go away quickly, so it's not a guarantee that they will still be there when you read this.
1. Newark (New York area) to London for $292 round-trip on Wow Air.
2. New York or San Francisco to Singapore for $647 or $648, respectively, round-trip on Singapore Airlines.
3. Seattle, Dallas, or Pheonix to Bali, Indonesia, for $731 round-trip, OR Boston, Chicago, or Washington, DC, to Bali for $746 round-trip — both on Delta.
4. Fort Lauderdale to Barbados for $164 round-trip on JetBlue.
5. Flights to Copenhagen starting at $308 round-trip, on various airlines.
6. Los Angeles to Tokyo for $446 round-trip on Singapore Airlines.
If none of these deals appeal to you but you're still in the mood to book a trip, here's how to find the cheapest airfare possible.