$919 Cheap Flights from Portland (PDX) to Monrovia (ROB)

View $919 flight on Tue, Mar 31, 2026Opens in a new window

Popular airlines from Portland International Airport (PDX) to Monrovia (ROB-Roberts Intl.)

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Cheap Flights from Portland to Monrovia (PDX-ROB)

Prices were available within the past 7 days and start at $919 for one-way flights and $1,484 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Mon, Nov 17 - Sun, Nov 23
PDX
Portland
ROB
Monrovia
$1,484 Roundtrip, found 3 days ago
$1,484
Roundtrip
found 3 days ago
Select United flight, departing Mon, Nov 17 from Portland to Monrovia, returning Sun, Nov 23, priced at $1,484 found 3 days ago
United
Mon, Nov 10 - Mon, Nov 17
PDX
Portland
ROB
Monrovia
$1,548 Roundtrip, found 7 hours ago
$1,548
Roundtrip
found 7 hours ago
Select United flight, departing Mon, Nov 10 from Portland to Monrovia, returning Mon, Nov 17, priced at $1,548 found 7 hours ago
United
Mon, Nov 10 - Mon, Nov 17
PDX
Portland
ROB
Monrovia
$1,560 Roundtrip, found 7 hours ago
$1,560
Roundtrip
found 7 hours ago
Select United flight, departing Mon, Nov 10 from Portland to Monrovia, returning Mon, Nov 17, priced at $1,560 found 7 hours ago
United
Mon, Nov 10 - Mon, Nov 17
PDX
Portland
ROB
Monrovia
$1,564 Roundtrip, found 7 hours ago
$1,564
Roundtrip
found 7 hours ago
Select United flight, departing Mon, Nov 10 from Portland to Monrovia, returning Mon, Nov 17, priced at $1,564 found 7 hours ago
United
Mon, Nov 10 - Mon, Nov 17
PDX
Portland
ROB
Monrovia
$1,576 Roundtrip, found 7 hours ago
$1,576
Roundtrip
found 7 hours ago
Select United flight, departing Mon, Nov 10 from Portland to Monrovia, returning Mon, Nov 17, priced at $1,576 found 7 hours ago
Hawaiian Airlines
Fri, Dec 5 - Fri, Jan 23
PDX
Portland
ROB
Monrovia
$1,582 Roundtrip, found 15 hours ago
$1,582
Roundtrip
found 15 hours ago
Select Hawaiian Airlines flight, departing Fri, Dec 5 from Portland to Monrovia, returning Fri, Jan 23, priced at $1,582 found 15 hours ago
United
Mon, Nov 17 - Thu, Nov 27
PDX
Portland
ROB
Monrovia
$1,600 Roundtrip, found 3 days ago
$1,600
Roundtrip
found 3 days ago
Select United flight, departing Mon, Nov 17 from Portland to Monrovia, returning Thu, Nov 27, priced at $1,600 found 3 days ago
Alaska Airlines
Fri, Dec 5 - Wed, Jan 21
PDX
Portland
ROB
Monrovia
$1,602 Roundtrip, found 15 hours ago
$1,602
Roundtrip
found 15 hours ago
Select Alaska Airlines flight, departing Fri, Dec 5 from Portland to Monrovia, returning Wed, Jan 21, priced at $1,602 found 15 hours ago
British Airways
Wed, Dec 24 - Sat, Jan 17
PDX
Portland
ROB
Monrovia
$2,080 Roundtrip, found 14 hours ago
$2,080
Roundtrip
found 14 hours ago
Select British Airways flight, departing Wed, Dec 24 from Portland to Monrovia, returning Sat, Jan 17, priced at $2,080 found 14 hours ago
Brussels Airlines
Tue, Dec 2 - Sat, Jan 24
PDX
Portland
ROB
Monrovia
$2,109 Roundtrip, found 15 hours ago
$2,109
Roundtrip
found 15 hours ago
Select Brussels Airlines flight, departing Tue, Dec 2 from Portland to Monrovia, returning Sat, Jan 24, priced at $2,109 found 15 hours ago

Alternative airports near Monrovia

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Roberts Intl. ROB. Cheapest option available. Average driving time to city center is 49 minutes. Flights from $1,826
ROB
Roberts Intl.
Cheapest
Average driving time to city center49 min
Flights from $1,826

Frequently asked questions

How much does a flight from Portland Intl. Airport (PDX) to Roberts Intl. Airport (ROB) cost?
Secure a cheap one-way flight from $919 or cheap return flight from $1,484 from Portland Intl. Airport (PDX) to Roberts Intl. Airport (ROB) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight deals on this route.
What is the cheapest month to fly from Portland Intl. Airport (PDX) to Roberts Intl. Airport (ROB)?
Planning your getaway for November is a good way to save, as it's the cheapest month for flights between PDX and ROB. You'll usually find the lowest prices during off-peak months.
What is the cheapest airline that flies from Portland Intl. Airport (PDX) to Roberts Intl. Airport (ROB)?
Expedia's filter tool lets you easily compare airlines, flight times and baggage options all in one place. Tailor the search to your trip, then sort by "Price (lowest to highest)" to find out which carrier offers the cheapest PDX to ROB flight.
How many flights per day from Portland Intl. Airport (PDX) to Roberts Intl. Airport (ROB)?
There aren't any daily nonstop flights available from Portland Intl. Airport (PDX) to Roberts Intl. Airport (ROB). But you can opt for flights with layovers. Filter your search on Expedia to include one or two stops, and you'll be cruising above the clouds in no time.
What day of the week has the most flights from PDX to ROB?
Typically you'll find the greatest selection of flight options on a Friday. Tuesdays tend to be the quietest.* However, this can vary based on the season, airline and other factors.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Portland Intl. Airport (PDX) to Roberts Intl. Airport (ROB)?
Choose a flight from Portland Intl. Airport (PDX) to Roberts Intl. Airport (ROB) that leaves before 3 PM to reduce the likelihood of delays and cancellations. Later departures have a 22% higher chance of being canceled, on average.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Portland Intl. Airport (PDX) to Roberts Intl. Airport (ROB) last-minute?
Booking your flight from PDX to ROB shortly before your getaway is typically more expensive. But if you're flexible with your travel dates and times, you could score a cheap last-minute fare.
Is it cheaper to book a PDX to ROB flight and hotel package?
You'll generally save money by booking a PDX to ROB flight and hotel package compared to booking separately. In fact, you could save hundreds of dollars by bundling with Expedia. And it's easy to manage everything in one convenient place. After selecting your ideal accommodations and flights, consider adding extras like car rentals, activities and tours.
Can I cancel or change the date of my flight from Portland Intl. Airport (PDX) to Roberts Intl. Airport (ROB)?
In most instances, you can modify or cancel your PDX to ROB flight. However, there may be additional fees, especially if you booked more than 24 hours ago. Double-check your itinerary for the airline's fees and guidelines on flight changes, or if you need more information, go to our Customer Service portal.

Travel information

Origin airport
Portland Intl.
Destination airport
Roberts Intl.
Airlines serving
British Airways, Brussels Airlines, United
Roundtrip price
$1,484
Distance
6957 mi

Book with confidence

Portland to Monrovia Flights

The cheapest times to fly from Portland to Monrovia

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Portland to Monrovia are during the month of November. You can find some of the cheapest flights from Portland to Monrovia with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Portland to Monrovia

Sunday is one of the best days to book for cheap flights from Portland to Monrovia: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Portland to Monrovia

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Portland to Monrovia in 2025. You can also book with separate airlines for your outbound and return journeys, from $919 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Portland to Monrovia flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Portland to Monrovia airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Portland to Monrovia Flights
*Available to One Key members.