Kenya is a major tourist hub, thousands of visitors come to the country from Europe, Asia, North America, the Middle East, and other parts of Africa.

Typically, there are two ways to fly to Mombasa: to take a flight to Jomo Kenyatta International airport in Nairobi and then a connecting flight onto Moi International Airport in Mombasa, or directly to Moi International airport in Mombasa. The former option tends to yield more availability as well as potentially cheaper fares, though charter flights that fly from various European destinations (such as Germany and London, England) can be found at great rates.

Prices vary depending on where you are flying from, but flights to Mombasa tend to fill up quickly from the of end June to early September, and from December to January — the main holiday season. For these times, it is advisable to book at least a few months in advance in order to get reasonably priced fares.

Outside these times of the year, however, there can be good deals on “off-season” rates. Before booking, shop around with various agencies both online and in your city, and ensure that rates quoted include any additional taxes, fuel surcharges, etc. Travel insurance is never a bad idea, particularly if the situation in the region may seem unstable (consult travel advisories regularly).

International Flights
Some of the following information was taken from dianibeach.co.uk, and may be useful for visitors from specific regions - please visit the site for more information:

Flights from Britain and Ireland to Kenya
London is by far the best departure point to Kenya from the British Isles, with direct flights to Nairobi seven times a week from Heathrow with both British Airways and Kenya Airways, taking around nine hours. Sometimes, cheaper alternatives can be found through indirect flights — airlines worth considering include Egyptair via Cairo, Ethiopian Airlines via Addis Abiba, ElAl via Israel, and Gulf Air, Emirates or Saudia via the Gulf, as well as KLM via the Netherlands. There are also several charter operators with whom you can get seats - only to Mombasa - out of London or Manchester.

Schedules and cost comparisons for direct flights from a variety of different airlines flying out of the UK, can be searched using Kayak UK

Flights to Kenya from the USA and Canada
There are no direct flights from the USA or Canada to East Africa, so you have to change planes and, quite possibly, airlines.The fastest routes to Nairobi are from New York via London, either on British Airways or on a combination of Virgin Atlantic and Kenya Airways. Alternatively, you can fly via various European hubs. Fares from the USA, purchased direct from the airline and flying mid-week in the low season, extend upwards from $1300 out of New York, and from $2600 out of Los Angeles, traveling on weekends will increase this air fare by $100-200.
From Canada, the airlines’ Toronto - Nairobi Apex fares start at around CDN$ 4000, but if you book through a Canadian travel agent you can cut the rate to as low as CDN$1500.

Schedules and cost comparisons for indirect and charter flights from a variety of different airlines flying out of North America, can be searched using the Orbitz Round Trip Air Tab or the Kayak US Cheap Flights service.

Flights from South Africa, Australia and New Zealand to Kenya
There are direct flights from Johannesburg to Nairobi operated by South African Airways and Kenya Airways. Booking direct with the airlines, fares start at R2800 for a fixed date one-month trip booked at least three days in advance. Open yearly returns start at R6430.  There are no direct flights from Australia or New Zealand-all require a stopover either in Asia, Southern Africa, or in the flight carriers home city. The most direct flights from Australia are via Johannesburg with SAA, via Harare Quantas and Air Zimbabwe, or via Singapore and Mauritius with Quantas and Air Mauritius.