Rare1 stop · 10.5h
WAS to LIMPeru
Lima
$347
usually $630
−45%
Most monthly lows $409–$630. Cheaper than every other month on record (3).
Flights · WAS → OSL
Washington to Oslo
Best fare, round trip
$703
Too little price history on this route to compare — the fare is shown as found.
Found
- Depart
- Mon 15 Mar
- Return
- Sun 21 Mar
- Stay
- 6 nights
- Flight
- 1 stop · 11.5h
- Airline
TAP Air Portugal
Cached fare — the booking search re-prices live before you pay.
NorwayOsloExpensive once you land, cheap to reach — and the fjords are a train ride, not another flight.Best windowJun–AugAirportsGardermoen (OSL) · Torp (TRF)Every route into OsloFare seasonality
When this route gets cheap.
The cheapest itinerary we are tracking makes one stop and takes about 11.5 hours outbound, on a 6-night trip — ticketed under TAP Air Portugal, which on a connecting fare need not operate every leg. At $703 for 6,233 km each way, that works out to about $56 per 1,000 km flown. That is above the $44 per 1,000 km typical of long-haul fares here. Across the 10 departure cities we track at a similar distance from Oslo, this fare ranks 9th — 50% above the $468 from Dubai. That puts it in the cheaper half of the 26 routes of similar length we watch out of Washington, where the middle fare is $713. We have 1 month of cached prices for this route so far — not enough to call a fare cheap or expensive, so we publish the price without a percentage. Fare history here is still too short to name a cheap season. The best time to be in Oslo: Jun–Aug.
The one day we hold a cached fare for
Press a date to compare its fares
The median cached fare across this calendar is 14% higher than when tracking began on 8 Aug — $541 then versus $619 now, across 10 recorded snapshots. This is a calendar-level trend, so an individual deal above can be lower. The lowest single day we have seen here is $541, on 16 Sep.
These are the only days we have a cached price for on this route so far — not the only days it flies. The search above covers any date.
Cached fares · checked 06 Oct 2026
We are still collecting this route's months — 1 month of cached prices so far, too few to chart.
Route facts
- Airports
- Dulles (IAD) · Reagan National (DCA) · Baltimore (BWI) ↔ Gardermoen (OSL) · Torp (TRF)
- Flight time
- ≈11.5 hours outbound
- Distance
- ≈6,233 km each way
- Airlines on the board
- TAP Air Portugal
- Itineraries
- Connections on current fares
- Best months to visit
- Jun–Aug
Good to know
WAS → OSL, answered.
How far in advance should I book WAS → Oslo?
We do not publish a number for this, because we cannot measure it yet. Answering it honestly means watching the same departure date on this route over many weeks as it approaches, and that archive is still filling up — so any "book N days ahead" figure here would be borrowed from somewhere else rather than measured. Our guide Why flight prices change covers the levers we can measure.
Are there nonstop flights from Washington to Oslo?
The current cheapest fares involve a connection, ticketed under TAP Air Portugal. We hold no nonstop fare on this route right now, which does not mean none flies — search your exact dates to see what does.
Are these prices guaranteed?
No — these are cached fares found on real searches (this one on 17 October). Airlines reprice constantly, so the booking search re-checks the live price before you pay. Fresher finds are far more likely to still be available.
Next step
Sleeping in Oslo?
Lock the flight first — then compare stays for 15–21 Mar '27 · 6 nights.
Browse hotelsMissed it?
Cached fares expire. This route has a feed of its own — follow it and the next WAS → OSL drop reaches you as soon as we find it.
Follow this route’s feedKeep browsing
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