Flights from Minneapolis-St. Paul (MSP) to Portland (PDX) are significantly cheaper on most Tuesdays and Wednesdays. Saturday departures are often a bit cheaper than other days, too. Compared to some other days
aim to purchase tickets 30–90 days before departure. If you want to book an international flight, you should start looking an average of five months in advance. This is what we call the “Goldilocks Window”: the ideal timeframe for booking flights—neither too early nor too late—to...