Cheap flights from Seattle, WA to Belfast, United Kingdom
Flights starting at £260. Choose between easyJet, Alaska Airlines, or Lufthansa to find the best price.
Make your travel wishlist, we'll do the rest
Hidden deals
Kiwi-Code uncovers prices airlines don't want you to see.
Effortless booking
Use our flexible filters to tailor your search.
Travel hacking
Look out for the travel hack star icon for even cheaper fares.
Tips to know when travelling to Belfast
Search by stops
- Nonstop
- Up to 1 stop
- Up to 2 stops
Search by carrier
Search by price
Search by departure date
Receive exclusive deals by email
By subscribing you agree to receive offers according to the conditions described in our Privacy Policy.
Travelers usually depart from Seattle–Tacoma International, or Kenmore Air Harbor Seaplane Base when they travel from Seattle to Belfast. Book your trip to arrive at Belfast International, or George Best Belfast City. The most popular airlines for this route are easyJet, Alaska Airlines, Lufthansa, British Airways, and Condor. Seattle and Belfast have 327 direct flights per week. When you arrive at Belfast, consider visiting Giant's Causeway, Bru Na Boinne Neolithic Site (County Meath, Ireland), and Trinity College, Dublin.
Check-in for a flight from Seattle to Belfast
Name | Carrier code | IATA Code | Passport needed during booking | Online check-in available |
---|---|---|---|---|
easyJet | EZY | U2 | No | Opens 720 days before flight Closes 2 hours before flight |
Alaska Airlines | ASA | AS | No | Opens 24 days before flight Closes 1 hours before flight |
Lufthansa | DLH | LH | No | 0 0 |
British Airways | BAW | BA | No | 0 0 |
Condor | CFG | DE | No | No |
Weather in Belfast
Average Weather
Month | Average monthly max temperature | Average monthly min temperature |
January | 6°C | 2°C |
February | 7°C | 3°C |
March | 8°C | 3°C |
April | 11°C | 4°C |
May | 13°C | 7°C |
June | 16°C | 10°C |
July | 17°C | 11°C |
August | 17°C | 11°C |
September | 15°C | 10°C |
October | 12°C | 8°C |
November | 9°C | 5°C |
December | 7°C | 3°C |
14 day forecast
Frequently asked questions
Planning a trip? Thanks to our Virtual Interlining algorithm, we offer billions of route combinations between any A and any B in the world by plane, train, and bus. Find the cheapest routes and best deals for you, as well as the best dates on which to travel.
Explore alternative trips
Flights from Seattle
- Flights from Seattle to London
- Flights from Seattle to Las Vegas
- Flights from Seattle to Denver
- Flights from Seattle to Phoenix
- Flights from Seattle to Dublin
- Flights from Seattle to Melbourne
- Flights from Seattle to Orlando
- Flights from Seattle to Salt Lake City
- Flights from Seattle to San Jose
- Flights from Seattle to Vancouver
- Flights from Seattle to Manchester
- Flights from Seattle to Edinburgh
- Flights from Seattle to San Francisco
- Flights from Seattle to Philadelphia
- Flights from Seattle to Dallas
- Flights from Seattle to Washington, D.C.
- Flights from Seattle to New York
- Flights from Seattle to Atlanta
- Flights from Seattle to Los Angeles
- Flights from Seattle to Rome
Flights to Belfast
- Flights from London to Belfast
- Flights from Manchester to Belfast
- Flights from Birmingham to Belfast
- Flights from Edinburgh to Belfast
- Flights from Nottingham to Belfast
- Flights from Barcelona to Belfast
- Flights from Glasgow to Belfast
- Flights from Southampton to Belfast
- Flights from Leeds to Belfast
- Flights from Dublin to Belfast
- Flights from Istanbul to Belfast
- Flights from Budapest to Belfast
- Flights from Cardiff to Belfast
- Flights from Stockholm to Belfast
- Flights from Tallinn to Belfast
- Flights from Madrid to Belfast
- Flights from Kraków to Belfast
- Flights from Faro to Belfast
- Flights from Alicante to Belfast
- Flights from Amsterdam to Belfast
Popular routes
- Flights from Zürich to Abidjan
- Flights from Abidjan to Zürich
- Flights from Singapore to Iquitos
- Flights from Ho Chi Minh City to Kisumu
- Flights from Culiacán to Mérida
- Flights from Montreal to Pucallpa
- Flights from Dnipro to Melbourne
- Flights from London to Milan
- Flights from Port of Spain to Santorini
- Flights from Juliaca to Beirut
- Flights from London to Faro
- Flights from Marseille to Asunción