Cheap flights from Portland to Washington, D.C. from $142

The month of February is, on average, the cheapest month to fly to Washington, D.C. from Portland, with most prices found around $376. If you’re not able to fly to Washington, D.C. in February, then January is your next best option. Flight prices from Portland to Washington, D.C. during January average around $417.

On average, the least expensive day to fly to Washington, D.C. from Portland is on a Thursday. momondo users have found tickets for Thursday departures for as low as $514. However, this price may fluctuate depending on the airline, the season, and holidays. When flying out on a Monday, the most expensive travel day of the week, you can expect to see flight prices from Portland to Washington, D.C. for around $673.

In the evening is the cheapest time of day to fly from Portland to Washington, D.C. when you can find flight prices for as low as $542. Flying to Washington, D.C. in the evening is an ideal time because this is during off-peak travel hours. Try not to purchase tickets in the morning because they tend to be around $564. Of course, these prices can vary depending on the time of year and what airport you fly to.

Fly from Portland to Baltimore/Washington for the best Portland - Washington, D.C. flight prices

You are more likely to see cheaper flights to Washington, D.C. from Portland when booking weeks ahead of your departure date. In general, you can expect to find flights to Washington, D.C. for around $443 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Washington, D.C. from Portland for as low as $328 on momondo.

There are 4 cabin classes available to choose from on Portland to Washington, D.C. 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 23% on your flight if you consider stops on a Portland to Washington, D.C. flight.

As of September 2026, prices for Portland to Washington, D.C. flights are approximately 98% more expensive when compared to flights at the same time last year.

Southwest, Frontier, and Delta are the most popular carriers operating from Portland to Washington, D.C.

United Airlines, Alaska Airlines and Delta are the top three most popular airlines that fly to Washington, D.C. from Portland according to our data. United Airlines is the first choice among our users, with 38% of people opting to fly with this airline when traveling to Washington, D.C.. Keep in mind that there are 6 different airlines that fly to Washington, D.C. on a routine basis, so you have a few additional options to choose from.

Chicago (ORD) was the most common stop: 67% of momondo users choosing 1-stop flights on this route connected there.

Flights via Chicago (ORD) offer the lowest average round-trip price of $302.

Flights connecting via Minneapolis (MSP) have the shortest average one-way travel time: 6h 45m.

Minneapolis (MSP) has the shortest average layover time for this route: 0h 57m.

5 flights are operational daily from Portland to Washington, D.C. as of September 2026. The most popular departure time for this route is 8:00AM, with 77% of flights per day taking off at noon.

The number of flights available between Portland and Washington, D.C. is 38 per week as of September 2026. The most frequent departure day is Thu, with 18% of weekly flights leaving on this day.