British Airways has Los Angeles to Warsaw available for $412 to $434 round trip through OTA sites found on Momondo.com and SkyScanner. I saw this fare on SecretFlying.com last night, and I see the price come up on ExploreTrip.com through meta-searches of Momondo.com and SkyScanner.com, but I am unable to locate these sub-$500 fares on Google Flights or any major OTA site or the British Airways or Aer Lingus websites. This means I have little guidance to finding available low fare dates. I simply tried dates between January and April 2017 and found a low $400s fare at each date on ExploreTrip.com.
ExploreTrip.com ticket Los Angeles LAX – London LHR – Warsaw WAW – LHR – LAX
$411.97 round trip Wed April 19- Fri April 29 British Airways outbound and Aer Lingus return
ExploreTrip.com ticket Los Angeles LAX – London LHR – Warsaw WAW – LHR – LAX
$433.97 round trip Fri March 11- Sun March 19 British Airways outbound and Aer Lingus return
ExploreTrip.com ticket Los Angeles LAX – London LHR – Warsaw WAW – LHR – LAX
$429.40 round trip Sat Feb 11- Sun Feb 19 Aer Lingus outbound and British Airways return
ExploreTrip.com ticket Los Angeles LAX – New York JFK (AA) – Helsinki, Finland (Finnair) – Warsaw WAW – LHR (BA) – LAX (BA)
$434.44 round trip Sat Jan 21- Sun Jan 29 American/Finnair outbound/British Airways return
Loyalty Traveler curated Airfare Deals and Google Flights and Kayak Explore tutorials.
How can you upgrade these cheap fares?
If you need Business Class, then these cheap fares are probably not for you.