Cheap flights from Missouri to Portland from $86

The cheapest month to fly to Portland from Missouri is in January. Flight prices, which tend to average around $291, are often lower during this time because this is during the off-season. If you don’t want to visit Portland in January, then you should wait until September to fly from Missouri, when ticket prices are also cheap, with an average price of $299.

The cheapest day to depart on your flight to Portland is on a Tuesday when prices can be found for as low as $278. This is often the case because there is less demand to fly during this day of the week. The most expensive day to fly to Portland is Monday, with ticket prices averaging around $594.

The cheapest time of day to fly to Portland is in the afternoon when flights can be purchased for as low as $381. At noon is when there is more demand to fly to Portland, so prices are often more expensive at around $556 per ticket.

Fly from Lambert-St Louis to Portland for the best Missouri - Portland flight prices

You are more likely to see cheaper flights to Portland from Missouri when booking weeks ahead of your departure date. In general, you can expect to find flights to Portland for around $354 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Portland from Missouri for as low as $274 on momondo.

There are 3 cabin classes available to choose from on Missouri to Portland flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Frontier, Southwest, and Allegiant Air are the most popular carriers operating from Missouri to Portland

Alaska Airlines, Southwest and United Airlines are the top three most popular airlines that fly to Portland from Missouri according to our data. Alaska Airlines is the first choice among our users, with 35% of people opting to fly with this airline when traveling to Portland. Keep in mind that there are 7 different airlines that fly to Portland on a routine basis, so you have a few additional options to choose from.

As of March 2026, there are 2 flights per day flying from Missouri to Portland. The most common time of day flights depart is 5:00PM, with 71% of flights taking off in the afternoon.

As of March 2026, there are 16 flights per week flying from Missouri to Portland. The most common day of the week flights depart is Tue, with 25% of flights taking off on this day.