Cheap flights from Washington, D.C. Dulles Intl Airport to Boston from $116

The cheapest month to fly to Portland, Maine from Washington, D.C. Dulles Intl Airport is in November. Flight prices, which tend to average around $254, are often lower during this time because this is during the off-season. If you aren’t able to travel to Portland, Maine during the month of November, then flying in January is also cheap. Prices for this month can be found on momondo for an average of $286.

On average, the least expensive day to fly to Portland, Maine from Washington, D.C. Dulles Intl Airport is on a Saturday. momondo users have found tickets for Saturday departures for as low as $294. However, this price may fluctuate depending on the airline, the season, and holidays. On the other hand, Thursday is the most expensive day to depart from Washington, D.C. Dulles Intl Airport because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $373.

In the evening is the cheapest time of day to fly from Washington, D.C. Dulles Intl Airport to Portland, Maine when you can find flight prices for as low as $298. Flying to Portland, Maine in the evening is an ideal time because this is during off-peak travel hours. Try not to purchase tickets in the afternoon because they tend to be around $385. Of course, these prices can vary depending on the time of year and what airport you fly to.

Fly from Washington, D.C. Dulles Intl to Portland for the best Washington, D.C. Dulles Intl - Portland flight prices

You are more likely to see cheaper flights to Portland, Maine from Washington, D.C. Dulles Intl Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to Portland, Maine for around $346 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Portland, Maine from Washington, D.C. Dulles Intl Airport for as low as $269 on momondo.

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

You could potentially save up to 60% on your flight if you consider stops on a Washington, D.C. Dulles Intl Airport to Portland, Maine flight.

As of February 2026, prices for Washington, D.C. Dulles Intl Airport to Portland, Maine flights are approximately 133% more expensive when compared to flights at the same time last year.

United Airlines and Delta are the most popular carriers operating from Washington, D.C. Dulles Intl to Portland

United Airlines, Delta and JetBlue are the top three most popular airlines that fly to Portland, Maine from Washington, D.C. Dulles Intl Airport according to our data. United Airlines is the first choice among our users, with 96% of people opting to fly with this airline when traveling to Portland, Maine. Keep in mind that there are 5 different airlines that fly to Portland, Maine on a routine basis, so you have a few additional options to choose from.

The number of flights available between Washington, D.C. Dulles Intl Airport and Portland, Maine is 4 per day as of February 2026. The most frequent departure time is 5:00PM, with 100% of daily flights leaving in the afternoon.

As of February 2026, 28 flights take off from Washington, D.C. Dulles Intl Airport and land in Portland, Maine each week. The most common flight departure day for this route is Mon, with 14% of weekly flights taking off on this day.