Cheap flights from Washington, D.C. Dulles Intl Airport to Porto from $259
This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Washington, D.C. Dulles Intl Airport to Porto departing on 8/3. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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How to get the cheapest flight ticket from Washington, D.C. Dulles Intl Airport to Porto
Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip
What is the cheapest month to fly to Porto?
The month of February is, on average, the cheapest month to fly to Porto from Washington, D.C. Dulles Intl Airport, with most prices found around $543. If you aren’t able to travel during the month of February, then book flights to Porto from Washington, D.C. Dulles Intl Airport during October instead. Flights to Porto in October, while not as cheap as those in February, still average around $551.
What is the cheapest day to depart on your flight to Porto?
The cheapest day to depart on your flight to Porto is on a Sunday when prices can be found for as low as $613. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Friday because tickets tend to average around $779. These prices are subject to change though, so be sure to set up a Price Alert for flights to Porto.
What is the cheapest time of day to depart on your flight to Porto?
In the afternoon is the cheapest time of day to fly from Washington, D.C. Dulles Intl Airport to Porto when you can find flight prices for as low as $698. Flying to Porto in the afternoon is an ideal time because this is during off-peak travel hours. If you have a flexible travel schedule, then try to avoid flying at noon when prices are $836 on average. Flights to Porto from Washington, D.C. Dulles Intl Airport at noon are generally more expensive because this time of day is more convenient for travelers’ schedules.
How far in advance should I book a flight to Porto?
You are more likely to see cheaper flights to Porto from Washington, D.C. Dulles Intl Airport when booking 17 weeks ahead of your departure date. In general, you can expect to find flights to Porto for around $718 when searching 17 weeks out.However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Porto from Washington, D.C. Dulles Intl Airport for as low as $569 on momondo.
What is the cheapest airline that flies from Washington, D.C. Dulles Intl to Porto?
TAP AIR PORTUGAL, Scandinavian Airlines, and United Airlines are the most popular carriers operating from Washington, D.C. Dulles Intl to Porto
What airlines fly to Porto?
TAP AIR PORTUGAL, United Airlines and Delta are the top three most popular airlines that fly to Porto from Washington, D.C. Dulles Intl Airport according to our data. TAP AIR PORTUGAL is the first choice among our users, with 75% of people opting to fly with this airline when traveling to Porto. Keep in mind that there are 9 different airlines that fly to Porto on a routine basis, so you have a few additional options to choose from.
When to book flights from Washington, D.C. Dulles Intl Airport to Porto
Cheap Washington, D.C. Dulles Intl Airport to Porto (IAD to OPO) flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from Washington, D.C. Dulles Intl Airport to Porto
How far is Washington, D.C. Dulles Intl to Porto by plane?
Washington, D.C. Dulles Intl and Porto are 3541.8 mi apart from one another. Typically, this will take 10h 00m by plane in normal conditions.
When did momondo last update prices for flights from Washington, D.C. Dulles Intl Airport to Porto Airport?
Prices for flights from Washington, D.C. Dulles Intl Airport to Porto Airport are refreshed on a daily basis.
How many operators does momondo search for flights from Washington, D.C. Dulles Intl Airport to Porto Airport?
As of June 2025, there are 9 operators available to choose from for flights from Washington, D.C. Dulles Intl Airport to Porto Airport.
How old do you have to be to fly from Washington, D.C. Dulles Intl Airport to Porto Airport?
Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Washington, D.C. Dulles Intl Airport to Porto Airport.
What documentation or ID do you need to fly to Porto Airport?
The travel and health documents required for your trip to Porto Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Porto Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.
What is the most popular airline from Washington, D.C. Dulles Intl Airport to Porto?
Based on momondo bookings for this flight route, the most popular airline on flight routes from Washington, D.C. Dulles Intl Airport to Porto is TAP AIR PORTUGAL (65% of total bookings). The next most popular airlines are United Airlines (8%), Delta (7%), and KLM (7%).
Best airlines flying from Washington, D.C. Dulles Intl Airport to Porto
Compare and see reviews for airlines that fly from Washington, D.C. Dulles Intl Airport to Porto with momondo
| Airline | Rating | Free Cancellation | Price | ||
|---|---|---|---|---|---|
| PriceFrom $418 | Free Cancellation | Rating 8.0 7,946 reviews | |||
| PriceFrom $422 | Free Cancellation | Rating 7.5 1,463 reviews | |||
| PriceFrom $430 | Free Cancellation | Rating 7.8 1,358 reviews | |||
| PriceFrom $459 | Free Cancellation | Rating 7.1 1,885 reviews | |||
| PriceFrom $515 | Free Cancellation | Rating 7.0 2,776 reviews | |||
| PriceFrom $543 | Free Cancellation | Rating 7.4 8,790 reviews | |||
| PriceFrom $554 | Free Cancellation | Rating 7.5 1,623 reviews | |||
| PriceFrom $573 | Free Cancellation | Rating 7.2 10,000 reviews | |||
| PriceFrom $603 | Free Cancellation | Rating 6.7 7,139 reviews |
Traveling to a place near Porto?
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Why should I use momondo to find a flight deal from Washington, D.C. to Porto?
Finding the right flight to Porto from Washington, D.C. is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to Porto quick and easy, saving you time and money.
Can I find flights from Washington, D.C. to Porto with flexible booking policies on momondo?
Yes. momondo allows you to filter the results for Washington, D.C. to Porto flights to just show those with flexible booking policies.
How can momondo help me find flights from Washington, D.C. to Porto?
Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Porto from Washington, D.C..
I’m not ready to book a flight from Washington, D.C. to Porto right now. Can momondo alert me if prices change?
Price alerts on flights to Porto from Washington, D.C. are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.