$981 Cheap Flights from Monrovia (ROB) to Philadelphia (PHL)

View $981 flight on Fri, Oct 17, 2025Opens in a new window

Popular airlines from Monrovia (ROB-Roberts Intl.) to Philadelphia Intl. Airport (PHL)

Cheap Flights from Monrovia to Philadelphia (ROB-PHL)

Prices were available within the past 7 days and start at $981 for one-way flights and $1,593 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Brussels Airlines
Sun, Nov 2 - Tue, Nov 18
ROB
Monrovia
PHL
Philadelphia
$1,593 Roundtrip, found 5 days ago
$1,593
Roundtrip
found 5 days ago
Select Brussels Airlines flight, departing Sun, Nov 2 from Monrovia to Philadelphia, returning Tue, Nov 18, priced at $1,593 found 5 days ago
United
Tue, Oct 21 - Thu, Nov 6
ROB
Monrovia
PHL
Philadelphia
$1,603 Roundtrip, found 5 days ago
$1,603
Roundtrip
found 5 days ago
Select United flight, departing Tue, Oct 21 from Monrovia to Philadelphia, returning Thu, Nov 6, priced at $1,603 found 5 days ago
United
Sun, Nov 2 - Mon, Nov 17
ROB
Monrovia
PHL
Philadelphia
$1,607 Roundtrip, found 5 days ago
$1,607
Roundtrip
found 5 days ago
Select United flight, departing Sun, Nov 2 from Monrovia to Philadelphia, returning Mon, Nov 17, priced at $1,607 found 5 days ago
United
Sun, Nov 2 - Sun, Nov 16
ROB
Monrovia
PHL
Philadelphia
$1,623 Roundtrip, found 5 days ago
$1,623
Roundtrip
found 5 days ago
Select United flight, departing Sun, Nov 2 from Monrovia to Philadelphia, returning Sun, Nov 16, priced at $1,623 found 5 days ago
Brussels Airlines
Wed, Mar 11 - Mon, Mar 30
ROB
Monrovia
PHL
Philadelphia
$1,627 Roundtrip, found 5 days ago
$1,627
Roundtrip
found 5 days ago
Select Brussels Airlines flight, departing Wed, Mar 11 from Monrovia to Philadelphia, returning Mon, Mar 30, priced at $1,627 found 5 days ago
Brussels Airlines
Wed, Mar 11 - Sat, Mar 28
ROB
Monrovia
PHL
Philadelphia
$1,632 Roundtrip, found 5 days ago
$1,632
Roundtrip
found 5 days ago
Select Brussels Airlines flight, departing Wed, Mar 11 from Monrovia to Philadelphia, returning Sat, Mar 28, priced at $1,632 found 5 days ago
Brussels Airlines
Wed, Mar 11 - Sun, Mar 29
ROB
Monrovia
PHL
Philadelphia
$1,645 Roundtrip, found 5 days ago
$1,645
Roundtrip
found 5 days ago
Select Brussels Airlines flight, departing Wed, Mar 11 from Monrovia to Philadelphia, returning Sun, Mar 29, priced at $1,645 found 5 days ago
American Airlines
Fri, Nov 14 - Wed, Dec 3
ROB
Monrovia
PHL
Philadelphia
$1,665 Roundtrip, found 5 days ago
$1,665
Roundtrip
found 5 days ago
Select American Airlines flight, departing Fri, Nov 14 from Monrovia to Philadelphia, returning Wed, Dec 3, priced at $1,665 found 5 days ago
Air Canada
Fri, Dec 12 - Sun, Jan 4
ROB
Monrovia
PHL
Philadelphia
$1,719 Roundtrip, found 6 days ago
$1,719
Roundtrip
found 6 days ago
Select Air Canada flight, departing Fri, Dec 12 from Monrovia to Philadelphia, returning Sun, Jan 4, priced at $1,719 found 6 days ago
Royal Air Maroc
Fri, Dec 12 - Sun, Jan 4
ROB
Monrovia
PHL
Philadelphia
$1,752 Roundtrip, found 6 days ago
$1,752
Roundtrip
found 6 days ago
Select Royal Air Maroc flight, departing Fri, Dec 12 from Monrovia to Philadelphia, returning Sun, Jan 4, priced at $1,752 found 6 days ago

Alternative airports near Philadelphia

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

Select flight to Philadelphia Intl. PHL. Cheapest and Closest option available. Average driving time to city center is 17 minutes. Flights from $1,603
PHL
Philadelphia Intl.
CheapestClosest
Average driving time to city center17 min
Flights from $1,603

Frequently asked questions

How much does a flight from Roberts Intl. Airport (ROB) to Philadelphia Intl. Airport (PHL) cost?
Get a cheap one-way flight from $981 or cheap return flight from $1,593 from Roberts Intl. Airport (ROB) to Philadelphia Intl. Airport (PHL) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight deals on this route.
What is the cheapest month to fly from Roberts Intl. Airport (ROB) to Philadelphia Intl. Airport (PHL)?
The cheapest month to fly from ROB to PHL is November, when demand is low. Off-peak season is typically when you'll find cheap fares for travel between these airports.
What is the cheapest airline that flies from Roberts Intl. Airport (ROB) to Philadelphia Intl. Airport (PHL)?
To find the cheapest airline that'll fly you from ROB to PHL, use Expedia's filter tool. Customize your search based on what's important to you, such as preferred carriers and seat class. You can then sort your results by "Price (lowest to highest)" to discover the cheapest flight right away.
How many flights per day from Roberts Intl. Airport (ROB) to Philadelphia Intl. Airport (PHL)?
You'll have to catch a flight with a layover when traveling from Roberts Intl. Airport (ROB) to Philadelphia Intl. Airport (PHL). Direct flights don't operate daily on this route. However, just filter your search to include one or two stops to find an option that works for you.
What day of the week has the most flights from ROB to PHL?
You'll typically find Tuesday the quietest day for flights, while Fridays tend to be the busiest.* However this can change from season to season and during peak travel times or public holidays.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Roberts Intl. Airport (ROB) to Philadelphia Intl. Airport (PHL)?
Opt for a flight from Roberts Intl. Airport (ROB) to Philadelphia Intl. Airport (PHL) 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 Roberts Intl. Airport (ROB) to Philadelphia Intl. Airport (PHL) last-minute?
Last-minute bookings from ROB to PHL are usually more expensive. To lock in the lowest prices, start looking for flights well in advance. That being said, if you're flexible with your travel dates, it's possible to score a cheap fare right before your journey.
Is it cheaper to book a ROB to PHL flight and hotel package?
Securing a ROB to PHL flight and hotel package is generally cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your trip all in one place. Choose from our extensive range of hotels and then add flights, activities and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Roberts Intl. Airport (ROB) to Philadelphia Intl. Airport (PHL)?
It's usually possible to cancel or reschedule your ROB to PHL flight. However, if the booking was made more than 24 hours ago, additional fees may apply. Refer to your airline's policies in your itinerary to see what changes are possible and whether any costs are involved. You'll also find further details on our Customer Service portal.

Travel information

Origin airport
Roberts Intl.
Destination airport
Philadelphia Intl.
Airlines serving
Brussels Airlines, United
Roundtrip price
$1,592
Distance
4617 mi

Book with confidence

Monrovia to Philadelphia Flights

The cheapest times to fly from Monrovia to Philadelphia

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 Monrovia to Philadelphia are during the month of November. You can find some of the cheapest flights from Monrovia to Philadelphia with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Monrovia to Philadelphia

Sunday is one of the best days to book for cheap flights from Monrovia to Philadelphia: 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 Monrovia to Philadelphia

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 Monrovia to Philadelphia in 2025. You can also book with separate airlines for your outbound and return journeys, from $981 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 Monrovia to Philadelphia 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 Monrovia to Philadelphia 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.

 

Monrovia to Philadelphia Flights

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*Available to One Key members.