The cheapest times to fly from PHX to ROB are

  • January 8th to March 25th
  • April 16th to June 10th
  • October 22nd to December 9th

based on data collected exclusively by Champion Traveler across tens of millions of flights. Among all the dates above, the very cheapest time to fly from PHX to ROB is mid May. Prices can be as high as $7111 for Saturday flights during mid December, or as low as $1606 for Sunday flights around mid May.


When to Fly to Monrovia

Flying from Phoenix, AZ (PHX) to Monrovia (ROB) will usually cost between $1755 to $5511 per person if booking more than four weeks in advance. On average the very cheapest time to fly is mid May with an average ticket price of $2227. Due to high demand the most expensive time to fly is mid December, with an average price of $4033. Planning your trip to low-cost times can easily save you $1806 on economy flights and even more on first-class flights. Generally, any price below $2181 can be considered a good price for a round-trip PHX to ROB flight.

See below for a graph of average weekly prices for the PHX to ROB route. All prices are for round-trip tickets in USD.

PHX to ROB Flight Prices

Compared to other flights, the PHX to ROB flight is more expensive than the average and costs more than the average flight leaving from Phoenix. The average price per mile (for a direct flight) is $0.2, which is below average.


Flight Prices by Day of the Week

Sunday is usually the cheapest day to depart and return on this flight. Saturdays are the most expensive days to fly to Monrovia, and Thursdays are the most expensive days to return to Phoenix. Selecting flights on the least expensive days could save you up to $6796 (50%) on this flight.

Departing prices are for round-trip flights returning on the day of departure. For example, a flight departing on Sunday and returning a week later will cost an average of $1942. Return trip prices are from the ROB to PHX flight, and often highlight the quality of our data in showing the same trend.

Departing Prices by Day

Departure Day Prices

Return Trip Prices by Day

Return Day Prices


Nonstop Flights and Layovers

Travelers looking to fly from PHX to ROB can generally find a 2-layover flight. Because there is not usually a direct flight option the real-world direct flight time of 12 hour 56 minutes may not be realistic.


Flight Hacking PHX to ROB

Flight hacking is when you book two tickets instead of a layover, sometimes with different airlines. You will need to either bring only a carry-on bag (highly recommended) or leave yourself plenty of time to go through security again. Flight hacking is completely allowed, but airlines don’t always tell you the cheapest way to get from PHX to ROB — but Champion Traveler does!

Hack #1: New York, NY (PHX > JFK > ROB)

  • Price for both tickets: $1688
  • Average savings: $493 (22.6%)

See PHX to JFK flights

Hack #2: Newark, NJ (PHX > EWR > ROB)

  • Price for both tickets: $1726
  • Average savings: $456 (20.88%)

See PHX to EWR flights

Hack #3: Boston, MA (PHX > BOS > ROB)

  • Price for both tickets: $1745
  • Average savings: $436 (19.99%)

See PHX to BOS flights


Flight Questions Answered

Still have questions about flying from PHX to ROB? We’ve got answers.

Which airlines fly this route?

You can find 14 major airlines flying this route most often: Air Canada, American, British Airways, Brussels Airlines, Delta, Ethiopian, Finnair, Iberia, JetBlue, Kenya Airways, Lufthansa, Royal Air Maroc, South African, United, and potentially more during busy seasons.

How far away is it from Monrovia Roberts International Airport to Phoenix Sky Harbor International Airport?

The distance between the two airports is roughly 6644 miles or 10692 kilometers.

How long does it take to fly from PHX to ROB?

The real-world flight time for a nonstop PHX to ROB flight is about 12 hour 56 minutes.

How many flights go between Phoenix, AZ and Monrovia?

It depends on the day of the week and the date, but a typical day might have around 6 available flights from PHX to ROB.


Airport Location Info


Departing Airport

Origination codePHX
Origination airport namePhoenix Sky Harbor International Airport
CityPhoenix, AZ
Countrythe United States

Return Airport

Destination codeROB
Destination airport nameMonrovia Roberts International Airport


Other Resources

Please note that while we’ve worked hard to analyzed tens of millions of flights to get you this data, we do not calculate current live prices or guarantee pricing. Please see our partners using the links above for current offers.