American Airlines Delta Airlines London London Gatwick LGW London LHR Portland PDX United Airlines Virgin Atlantic

AA/DL/UA Portland PDX to London $565-$601 Oct-May

All three major alliances have Portland to London on sale for around $600 round trip for travel departures from late October to May 10. Delta and American offer these discount prices from late October to May 10. United/Star Alliance only lowers fares for April-May departures at time of post. You can even fly at Christmas time with Delta/Virgin Atlantic for $639, although Google Flights shows even lower fares in the $580s if you can find an OTA selling at that price.

American Airlines Portland PDX – Los Angeles LAX – London LHR – LAX (AA 135 77W aircraft) – PDX

$598.66 round trip Sat March 11 – Sun March 19

PDX-LHR $598 AA Mar11-19

I found $565 round trip tickets with American, however, the itinerary involved an overnight in New York.

Delta Airlines  Portland PDX – Seattle SEA – London LHR (Virgin Atlantic) – Seattle (Virgin Atlantic) – PDX

$601.26 round trip   Sat May 6 – Mon May 15

PDX-LHR $601 DL May6-15

United Airlines Portland PDX – San Francisco SFO – London LHR – SFO – PDX

$601.26 round trip Sat May 6 – Mon May 15

PDX-LHR $601 UA May6-15


Christmas Season Fares through OTA meta-search

$639 round trip Delta/Virgin Atlantic Dec 19 – Dec 28

PDX-LHR $639 DL-MOMota Dec19-28

Loyalty Traveler curated Airfare Deals and Google Flights and Kayak Explore tutorials.