From Northwestern Ontario to the far east of Newfoundland, hop aboard 4-star Porter Airlines with a sale that has slashed prices on domestic flights to the lowest fares we've seen in the market for travel into spring.

Travel is valid through June 26, including weekends, with most availability on Tuesdays, Wednesdays and Saturdays (Dec. 14 - Jan. 6 is not available at these rates).

From Ottawa, sample outbound one-way fares (including tax) include:

• Toronto ... $101 (nonstop)
• Quebec ... $150
• Moncton ... $154 (nonstop)
• Thunder Bay ... $157
• Halifax ... $161 (nonstop)

From Toronto, sample outbound one-way fares (including tax) include:

• Montreal ... $102 (nonstop)
• Sudbury ... $106 (nonstop)
• Ottawa ... $112 (nonstop)
• Thunder Bay ... $119 (nonstop)
• Mont Tremblant (service ends April 7) ... $123
• Halifax ... $189

From Halifax, sample outbound one-way fares (including tax) include:

• St. John's ... $108 (nonstop)
• Montreal ... $164 (nonstop)
• Ottawa ... $164 (nonstop)
• Toronto ... $180

From Montreal, sample outbound one-way fares (including tax) include:

• Toronto ... $109 (nonstop)
• Thunder Bay ... $166
• Sudbury ... $166
• Halifax ... $170 (nonstop)

This sale, which requires a 14-day advance purchase, ends 11:59 p.m. ET Friday, Dec. 7. We suggest booking early to secure sale fares on popular dates before limited seats sell out.

Note: Prices on Porter Airlines’ page will first appear as one way before tax. To see the tax-inclusive fare, hover over the pre-tax price. We're finding that the return flights are sometimes even less.

Porter Airlines was honored on Conde Nast Traveler's Readers' Choice Top 30 Airlines list and placed second worldwide in the Small Airlines category. The airline boasts an official 4-star rating from Skytrax, custom leather upholstery and more legroom than any cabin in its class. In-flight service includes free snacks, soft drinks, wine and beer.