How far ahead should I book a flight from Phnom Penh to Siem Reap with Cambodia Angkor Air?

Booking with Cambodia Angkor Air 77 days in advance of your planned departure date is, on average, the best time to get cheap flights from Phnom Penh to Siem Reap. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

What is the cheapest month to book a flight from Phnom Penh to Siem Reap with Cambodia Angkor Air?

Currently, the most affordable month to book a Cambodia Angkor Air flight from Phnom Penh to Siem Reap in August, with an average price of HK$698. Conversely, traveling with Cambodia Angkor Air from Phnom Penh to Siem Reap in April will be the most expensive, with an average cost of HK$1,646. Various factors influence flight prices, so comparing airlines, departure airports, and times can help reduce costs.

In terms of precipitation, rainfall in Siem Reap ranges from 0.0 - 260.0 inches per month. September is typically the wettest month, when rainfall can reach 260.0 mm. January is typically the driest time to visit Siem Reap when rainfall is around 0.0 mm.

If weather is an important factor for your trip to Siem Reap, use this chart to help with planning. For those seeking warmer temperatures, April is the ideal time of year to visit, when temperatures reach an average of 29.0 C. Travellers hoping to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 24.0 C).

Find Cambodia Angkor Air Flights from Phnom Penh to Siem Reap, Cambodia

Cambodia Angkor Air flights from Phnom Penh to Siem Reap in 2026

Popular in	April
Cheapest in	July
Average price (all airlines)	HK$823

Highest demand for flights from Phnom Penh Techo Intl to Siem Reap–Angkor Intl; 15% potential price increase.

Search Deals

Best time to find cheap flights from Phnom Penh Techo Intl to Siem Reap–Angkor Intl; 2% potential price drop.

Search Deals

Average price for all Phnom Penh Techo Intl to Siem Reap–Angkor Intl flights (one-way and round-trip).

Search Deals

Prices

The best time to book a flight to Siem Reap with Cambodia Angkor Air is 77 days before departure. On average, fares are higher if you book 82 days before departure.

Which month is the cheapest to fly Economy class from Phnom Penh to Siem Reap?

For Economy class flights, the cheapest month to fly this route is August. The most expensive months are April and May.

Best time to book a flight from Phnom Penh to Siem Reap

Have a flexible travel schedule? Discover the best time to fly to Siem Reap from Phnom Penh with our price prediction graph.

KTI-SAI

Estimated return price

Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Browse thousands of different options on Cheapflights for your next trip

Complete your trip

Other carriers

Other destinations

Complete your trip

Siem Reap car hire

Siem Reap–Angkor Intl Airport car hire

Old French Quarter car hire

Taphul Village Area car hire

Wat Bo Area car hire

Wat Polanka Area car hire

Wat Damnak Area car hire

Night Market Area car hire

Phsar Leu Area car hire

Royal Gardens Area car hire

Old Market Area car hire

See what others are saying about Cambodia Angkor Air

Overview

Cambodia Angkor Air

8.1

Very Good

11 reviews

Check prices

Overview

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book With Flexibility

Our users can plan ahead with confidence and find flights with no change fees.

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.

Cambodia Angkor Air flights from Phnom Penh to Siem Reap in 2026

Popular in

Cheapest in

Average price (all airlines)

When is the best time to book a flight to Siem Reap with Cambodia Angkor Air?

The best time to book a flight to Siem Reap with Cambodia Angkor Air is 77 days before departure. On average, fares are higher if you book 82 days before departure.

Which month is the cheapest to fly Economy class from Phnom Penh to Siem Reap?

For Economy class flights, the cheapest month to fly this route is August. The most expensive months are April and May.

Rainfall in Siem Reap by month

In terms of precipitation, rainfall in Siem Reap ranges from 0.0 - 260.0 inches per month. September is typically the wettest month, when rainfall can reach 260.0 mm. January is typically the driest time to visit Siem Reap when rainfall is around 0.0 mm.

Temperature in Siem Reap by month

Best time to book a flight from Phnom Penh to Siem Reap

Have a flexible travel schedule? Discover the best time to fly to Siem Reap from Phnom Penh with our price prediction graph.

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Complete your trip

Complete your trip to Siem Reap by adding a car hire and/or hotel booking to your travel itinerary.

Other airlines serving Phnom Penh and Siem Reap

Choose from other airlines serving Phnom Penh and Siem Reap.

Other popular destinations in Asia

If Siem Reap is not for you, choose from these other destinations located in Asia. Flight routes are based on user searches made on Cheapflights and were last updated on 25 August 2026.

See what others are saying about Cambodia Angkor Air

Overview

100% Free

Book With Flexibility

Travel Smart

Cambodia Angkor Air flights from Phnom Penh to Siem Reap, Cambodia (KTI - SAI)

Cambodia Angkor Air flights from Phnom Penh to Siem Reap in 2026

Popular in

Cheapest in

Average price (all airlines)

When is the best time to book a flight to Siem Reap with Cambodia Angkor Air?

The best time to book a flight to Siem Reap with Cambodia Angkor Air is 77 days before departure. On average, fares are higher if you book 82 days before departure.

Which month is the cheapest to fly Economy class from Phnom Penh to Siem Reap?

For Economy class flights, the cheapest month to fly this route is August. The most expensive months are April and May.

Rainfall in Siem Reap by month

In terms of precipitation, rainfall in Siem Reap ranges from 0.0 - 260.0 inches per month. September is typically the wettest month, when rainfall can reach 260.0 mm. January is typically the driest time to visit Siem Reap when rainfall is around 0.0 mm.

Temperature in Siem Reap by month

Best time to book a flight from Phnom Penh to Siem Reap

Have a flexible travel schedule? Discover the best time to fly to Siem Reap from Phnom Penh with our price prediction graph.

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Complete your trip

Complete your trip to Siem Reap by adding a car hire and/or hotel booking to your travel itinerary.

Other airlines serving Phnom Penh and Siem Reap

Choose from other airlines serving Phnom Penh and Siem Reap.

Other popular destinations in Asia

If Siem Reap is not for you, choose from these other destinations located in Asia. Flight routes are based on user searches made on Cheapflights and were last updated on 25 August 2026.

See what others are saying about Cambodia Angkor Air

Overview

100% Free

Book With Flexibility

Travel Smart