Flight sales are generally pretty straightforward. The airline offers low-cost tickets. You figure out how much it'll cost to bring some bags. That's about it. However, that's not the case with this week-long sale from Scandinavian Airlines.
Starting Monday, kids fly free on flights to all European destinations. There aren't many perks of traveling with kids, so this is one to savor. Normally, you get stares as you go to your seat, and other passengers pray you aren't setting a toddler next to them. You can't sleep until the kid's sleeping. You have to buy a full-price ticket for your infant. (Yeah, babies have to have a seat on an international flight, even if they aren't physically capable of sitting up.)
The airline has flights out of Boston, New York, Miami, Washington D.C., Chicago, San Francisco, and Los Angeles, and it flies to locations in Sweden, Norway, Finland, and Denmark.
The base fares are sometimes cheap but aren't entirely remarkable. A quick scan of flights leaving New York shows $548 roundtrip tickets to Copenhagen and $597 roundtrip flights to Stockholm and Oslo. But start adding in some free tickets and the per-person cost drops quickly. (Though, you do still have to pay applicable taxes on the free tickets.)