The honest answer to when you should fly Phoenix to Belfast is mostly about weather and demand at the far end. On three years of daily observations at the arrival airport, May-Aug gives the most comfortable combination of temperature and rainfall in Belfast.
Averages below come from three full years of daily readings at Belfast’s main airport, not from a seasonal generalisation. The warmest month is July (average high 18°C), the coolest is January (average low 3°C), and the wettest is June (129 mm).
| Month | Avg high | Avg low | Rainfall | Wet days | Phoenix high |
|---|---|---|---|---|---|
| January | 6°C | 3°C | 92 mm | 15 | 19°C |
| February | 8°C | 4°C | 84 mm | 18 | 23°C |
| March | 10°C | 5°C | 79 mm | 14 | 27°C |
| April | 12°C | 6°C | 82 mm | 15 | 30°C |
| May good | 16°C | 9°C | 78 mm | 15 | 35°C |
| June good | 17°C | 11°C | 129 mm | 19 | 41°C |
| July good | 18°C | 13°C | 81 mm | 16 | 42°C |
| August good | 18°C | 13°C | 112 mm | 20 | 42°C |
| September | 16°C | 11°C | 111 mm | 17 | 38°C |
| October | 13°C | 10°C | 97 mm | 15 | 33°C |
| November | 10°C | 6°C | 90 mm | 15 | 24°C |
| December | 9°C | 5°C | 122 mm | 18 | 21°C |
Climate data: Open-Meteo reanalysis archive.
Belfast runs 8 hours ahead of Phoenix. Travelling east is the harder direction to adjust to, so if the trip is short, an early departure that lands in daylight is worth more than a marginally cheaper overnight.
We publish observed fares for this route when we have them, and say nothing when we do not — there is no estimate on this page. What holds regardless of the route:
Midweek departures are consistently cheaper than Friday and Sunday on most routes, because that is where demand sits rather than because of any pricing trick. Where we have observed fares for Phoenix–Belfast, the weekday breakdown appears further down this page; where we do not, we leave it out rather than estimate it.
Top-rated tours and experiences in Belfast, ranked by traveller rating. Prices are per person and change with date and group size.
Nightly rates in Belfast for a sample two-night stay for two adults from 29 Sep 2026, cheapest first. Rates move with your dates — check availability for a live quote.
